Electric drive device and electric power steering device

文档序号：1493650 发布日期：2020-02-04 浏览：10次中文

阅读说明：本技术 电动驱动装置和电动助力转向装置 (Electric drive device and electric power steering device ) 是由岛川茂清水友里须永崇森本匡一铃木良一于 2018-06-01 设计创作，主要内容包括：本发明提供能够抑制磁传感器的温度上升的电动驱动装置和电动助力转向装置。电动驱动装置具备：电动马达；电子控制装置,其是为了对电动马达进行驱动控制而设置的,包含设于轴的靠负载相反侧的端部的磁体、以及位于轴的负载相反侧且配置在轴的轴向的延长线上的电路基板；第1线圈布线,其将电动马达的第1线圈组和电路基板连接起来；以及第2线圈布线,其将电动马达的第2线圈组和电路基板连接起来。第1线圈布线和第2线圈布线均具有：第1部位,其在与轴的轴向交叉的方向上突出到壳体的外侧；以及第2部位,其在壳体的外侧自第1部位朝向电路基板突出。(The invention provides an electric drive device and an electric power steering device capable of suppressing temperature rise of a magnetic sensor. The electric drive device is provided with: an electric motor; an electronic control device provided for driving and controlling the electric motor, the electronic control device including a magnet provided at an end of the shaft on a side opposite to the load, and a circuit board located on a side opposite to the load of the shaft and arranged on an extension of an axial direction of the shaft; a1 st coil wiring for connecting the 1 st coil group of the electric motor and the circuit board; and a2 nd coil wiring connecting the 2 nd coil group of the electric motor and the circuit substrate. The 1 st coil wiring and the 2 nd coil wiring each have: a1 st portion protruding to the outside of the housing in a direction intersecting the axial direction of the shaft; and a2 nd portion protruding from the 1 st portion toward the circuit board outside the case.)

1. An electric drive device, wherein,

the electric drive device is provided with:

an electric motor including a shaft, a motor rotor interlocked with the shaft, a motor stator having a stator core for rotating the motor rotor, a plurality of coil groups divided into at least two systems of a1 st coil group and a2 nd coil group for every 3 phases and exciting the stator core with 3-phase alternating current, and a tubular case accommodating the motor rotor, the motor stator, and the plurality of coil groups inside;

an electronic control device provided for driving and controlling the electric motor, the electronic control device including a magnet provided at an end portion of the shaft on a side opposite to a load, and 1 circuit board located on a side opposite to the load of the shaft and arranged on an extension line of an axial direction of the shaft;

a1 st coil wiring connecting the 1 st coil group and the circuit board; and

a2 nd coil wiring connecting the 2 nd coil group and the circuit substrate,

the circuit board includes:

a substrate main body;

a detection circuit including a magnetic sensor that detects rotation of the magnet;

a1 st power circuit including a plurality of electronic components that supply current to the 1 st coil group;

a2 nd power circuit including a plurality of electronic components that supply current to the 2 nd coil group; and

a control circuit including an electronic component that controls a current supplied to at least one of the 1 st power circuit and the 2 nd power circuit,

the detection circuit is mounted on the No. 1 surface of the substrate main body,

at least a part of the electronic components included in the 1 st power circuit and at least a part of the electronic components included in the 2 nd power circuit are mounted on a2 nd surface of the substrate main body on a side opposite to the 1 st surface,

the 1 st coil wiring and the 2 nd coil wiring each have:

a1 st portion protruding to an outside of the housing in a direction intersecting an axial direction of the shaft; and

a2 nd portion protruding from the 1 st portion toward the circuit board on the outer side,

the 2 nd portion of the 1 st coil wiring and the 2 nd portion of the 2 nd coil wiring are both disposed on a side defined by a straight line passing through a center of the circuit board when viewed from a normal direction of the circuit board.

2. The electric drive apparatus according to claim 1,

the 2 nd portion of the 1 st coil wiring and the 2 nd portion of the 2 nd coil wiring are arranged so as to be aligned in one direction when viewed from a normal direction of the circuit board.

3. The electric drive apparatus according to claim 1 or 2,

the 2 nd portion of the 1 st coil wiring is connected to the 1 st power circuit from a position closer to the outer periphery of the circuit board than the electronic component included in the 1 st power circuit,

the 2 nd portion of the 2 nd coil wiring is connected to the 2 nd power circuit from a position closer to the outer periphery of the circuit board than the electronic component included in the 2 nd power circuit.

4. The electric drive apparatus according to any one of claims 1 to 3,

the circuit board includes:

a1 st via hole connected to the 2 nd portion of the 1 st coil wiring; and

a2 nd via hole connected to the 2 nd portion of the 2 nd coil wiring,

when viewed from a normal direction of the circuit board, an arrangement position of the electronic component included in the 1 st power circuit is present between an arrangement position of the detection circuit and the 1 st through hole, and an arrangement position of the electronic component included in the 2 nd power circuit is present between the arrangement position of the detection circuit and the 2 nd through hole.

5. The electric drive apparatus according to claim 4,

when viewed from the direction of the normal line of the circuit board,

an arrangement position of the electronic component included in the control circuit is present on the opposite side of the 1 st through hole with respect to an arrangement position of the electronic component included in the 1 st power circuit,

an arrangement position of the electronic component included in the control circuit is located on the opposite side of the 2 nd through hole with respect to an arrangement position of the electronic component included in the 2 nd power circuit.

6. The electric drive apparatus according to any one of claims 1 to 5,

the electric drive device further comprises a capacitor disposed on the circuit board,

when viewed from a normal direction of the circuit board, the arrangement position of the detection circuit is located on the opposite side of the arrangement position of the electronic component included in the 1 st power circuit or the 2 nd power circuit with the arrangement position of the capacitor interposed therebetween.

7. The electric drive apparatus according to any one of claims 1 to 6,

when viewed from a normal direction of the circuit board, the arrangement position of the detection circuit is located on a side opposite to the arrangement position of the electronic component included in the 1 st power circuit or the 2 nd power circuit with respect to a straight line passing through a center of the circuit board.

8. The electric drive apparatus according to any one of claims 1 to 7,

the electric drive device further comprises a connector connected to the circuit board,

the connector is disposed outside the electric motor when viewed in the axial direction of the shaft.

9. The electric drive apparatus according to any one of claims 1 to 8,

the electric drive device further includes a heat sink that supports the circuit board.

10. The electric drive apparatus according to claim 9,

the heat sink has:

a1 st bump which is opposite to at least one of the 1 st power circuit and the 2 nd power circuit and is bumped toward the circuit substrate side; and

and a2 nd bump portion which faces the control circuit and is bumped toward the circuit substrate side.

11. The electric drive apparatus according to claim 10,

the electric drive device further includes:

a1 st heat dissipating material provided on the 1 st raised portion; and

and a2 nd heat dissipating material provided to the 2 nd bump.

12. The electric drive apparatus according to any one of claims 9 to 11,

the heat sink further has a concave portion facing the circuit substrate and recessed toward an opposite side of the circuit substrate,

the capacitor disposed on the circuit board is housed in the recess.

13. The electric drive apparatus according to any one of claims 9 to 12,

the electric drive device further includes an annular wall portion disposed between the heat sink and the circuit board,

the heat sink has a through hole through which the shaft passes,

the through hole is located inside the ring of the wall portion when viewed from the axial direction of the shaft.

14. The electric drive apparatus according to claim 13,

the electric drive device further includes a plurality of ribs that connect the outer peripheral surface of the wall portion and the heat sink.

15. The electric drive apparatus according to claim 13 or 14,

the electric drive device further includes a cap detachably attached to an end portion of the wall portion on the side of the circuit board,

the cap has:

a top plate portion opposing the magnet; and

a rim portion supporting an outer periphery of the top plate portion,

the material of the top plate is resin.

16. The electric drive apparatus according to claim 13 or 14,

the electric drive device further includes an elastic body disposed between the wall portion and the circuit board.

17. The electric drive apparatus according to claim 16,

the elastic body has a ring shape and is formed by a plurality of elastic bodies,

the through hole is located inside the ring of the elastic body when viewed from the axial direction of the shaft.

18. The electric drive apparatus according to any one of claims 9 to 17,

the electric drive device further includes an adapter disposed between the electric motor and the heat sink,

the 1 st coil wiring and the 2 nd coil wiring each further have a bent portion bent between the 1 st site and the 2 nd site,

the bent portion is disposed inside the adapter.

19. An electric drive device, wherein,

the electric drive device is provided with:

an electronic control device provided for driving and controlling the electric motor, the electronic control device including a magnet provided at an end portion of the shaft on a side opposite to a load, 1 circuit board located on a side opposite to the load of the shaft and arranged on an extension line of an axial direction of the shaft, a cover body covering the circuit board, and a connector connected to the circuit board;

a1 st coil wiring connecting the 1 st coil group and the circuit board; and

a2 nd coil wiring connecting the 2 nd coil group and the circuit substrate,

the circuit board includes:

a substrate main body;

a detection circuit including a magnetic sensor that detects rotation of the magnet;

a1 st power circuit including a plurality of electronic components that supply current to the 1 st coil group;

a2 nd power circuit including a plurality of electronic components that supply current to the 2 nd coil group; and

a control circuit including an electronic component that controls a current supplied to at least one of the 1 st power circuit and the 2 nd power circuit,

the detection circuit is mounted on the No. 1 surface of the substrate main body,

the 1 st coil wiring and the 2 nd coil wiring each have:

a1 st portion protruding to an outside of the housing in a direction intersecting an axial direction of the shaft; and

a2 nd portion protruding from the 1 st portion toward the circuit board on the outer side,

the cover body has:

a cover body main body; and

and an exterior part of the connector, which is formed integrally with the cover body.

20. An electric power steering apparatus, wherein,

the electric power steering apparatus is provided with the electric drive apparatus according to any one of claims 1 to 19,

the electric drive device is capable of generating an assist steering torque.

Technical Field

The present invention relates to an electric drive device and an electric power steering device having an electronic control device for controlling rotation of an electric motor.

Background

An electric power steering apparatus that generates an assist steering torque by an electric motor includes an electronic control unit as a device for controlling the electric motor. For example, patent document 1 describes a driving device capable of mounting electronic components on a substrate at high density.

Disclosure of Invention

Problems to be solved by the invention

In the drive device of patent document 1, the switching element constituting the 1 st inverter unit and the switching element constituting the 2 nd inverter unit are arranged symmetrically with respect to the axial center of the motor. The switching element constituting the 1 st inverter unit and the switching element constituting the 2 nd inverter unit are heat generating elements generating a large amount of heat among electronic components included in the driving device. Further, a rotation angle sensor is disposed at the axial center of the motor. Since the rotation angle sensor has heat generating elements on both sides thereof, there is a possibility that the rotation angle sensor is heated from both sides.

The present invention has been made in view of the above problems, and an object thereof is to provide an electric drive device and an electric power steering device that can suppress a temperature rise of a magnetic sensor.

Means for solving the problems

In order to achieve the above object, an electric drive device according to one aspect includes: an electric motor including a shaft, a motor rotor interlocked with the shaft, a motor stator having a stator core for rotating the motor rotor, a plurality of coil groups divided into at least two systems of a1 st coil group and a2 nd coil group for every 3 phases and exciting the stator core with 3-phase alternating current, and a tubular case accommodating the motor rotor, the motor stator, and the plurality of coil groups inside; an electronic control device provided for driving and controlling the electric motor, the electronic control device including a magnet provided at an end portion of the shaft on a side opposite to a load, and a circuit board located on a side opposite to the load of the shaft and arranged on an extension line of an axial direction of the shaft; a1 st coil wiring connecting the 1 st coil group and the circuit board; and a2 nd coil wiring connecting the 2 nd coil group and the circuit board, the circuit board having: a detection circuit including a magnetic sensor that detects rotation of the magnet; a1 st power circuit including a plurality of electronic components that supply current to the 1 st coil group; a2 nd power circuit including a plurality of electronic components that supply current to the 2 nd coil group; and a control circuit including an electronic component that controls a current supplied to at least one of the 1 st power circuit and the 2 nd power circuit, wherein each of the 1 st coil wiring and the 2 nd coil wiring includes: a1 st portion protruding to an outside of the housing in a direction intersecting an axial direction of the shaft; and a2 nd portion protruding from the 1 st portion toward the circuit board on the outer side.

Thus, the 1 st power circuit and the 2 nd power circuit can be disposed at positions close to the outer periphery of the circuit board, and the distance between the magnetic sensor and each of the 1 st power circuit and the 2 nd power circuit can be increased. Thus, heat generated by the 1 st power circuit and the 2 nd power circuit is not easily transferred to the magnetic sensor, and therefore, a temperature rise of the magnetic sensor can be suppressed.

Preferably, the 1 st coil wiring and the 2 nd coil wiring are disposed adjacent to each other. This enables the 1 st power circuit and the 2 nd power circuit to be disposed adjacent to each other.

Preferably, the 2 nd portion of the 1 st coil wiring is connected to the 1 st power circuit from a position closer to the outer periphery of the circuit board than the electronic component included in the 1 st power circuit. This makes it possible to separate the 1 st coil wiring from the magnetic sensor, and to suppress the influence of the magnetic field generated by the current flowing through the 1 st coil wiring on the magnetic sensor.

Preferably, the circuit board has a1 st through hole connected to the 2 nd portion of the 1 st coil wiring, and an arrangement position of the electronic component included in the 1 st power circuit is located between an arrangement position of the detection circuit and the 1 st through hole when viewed from a normal direction of the circuit board. This makes it possible to separate the current path from the 1 st power circuit to the electric motor from the magnetic sensor.

Preferably, when viewed from a normal direction of the circuit board, an arrangement position of the electronic component included in the control circuit is located on a side opposite to the 1 st through hole with an arrangement position of the electronic component included in the 1 st power circuit interposed therebetween. This makes it possible to separate the current path from the 1 st power circuit to the electric motor from the control circuit.

Preferably, the 2 nd portion of the 2 nd coil wiring is connected to the 2 nd power circuit from a position closer to an outer periphery of the circuit board than the electronic component included in the 2 nd power circuit. This makes it possible to separate the 2 nd coil wiring from the magnetic sensor, and to suppress the influence of the magnetic field generated by the current flowing through the 2 nd coil wiring on the magnetic sensor.

Preferably, the circuit board has a2 nd through hole connected to the 2 nd portion of the 2 nd coil wiring, and an arrangement position of the electronic component included in the 2 nd power circuit is located between an arrangement position of the detection circuit and the 2 nd through hole when viewed from a normal direction of the circuit board. This makes it possible to separate the current path from the 2 nd power circuit to the electric motor from the magnetic sensor.

Preferably, when viewed from a normal direction of the circuit board, an arrangement position of the electronic component included in the control circuit is located on a side opposite to the 2 nd through hole with an arrangement position of the electronic component included in the 2 nd power circuit interposed therebetween. This makes it possible to separate the current path from the 2 nd power circuit to the electric motor from the control circuit.

Preferably, the power supply device further includes a capacitor disposed on the circuit board, and the detection circuit is disposed on a side opposite to a position where the electronic component included in the 1 st power circuit or the 2 nd power circuit is disposed with a position of the capacitor interposed therebetween when viewed from a normal direction of the circuit board. This makes it possible to further increase the separation distance between the 1 st power circuit and the magnetic sensor or the separation distance between the 2 nd power circuit and the magnetic sensor.

Preferably, the arrangement position of the detection circuit is located on the opposite side of the arrangement position of the electronic component included in the 1 st power circuit or the 2 nd power circuit with respect to a straight line passing through the center of the circuit board when viewed from the normal direction of the circuit board. This makes it possible to further increase the separation distance between the 1 st power circuit and the magnetic sensor or the separation distance between the 2 nd power circuit and the magnetic sensor.

Preferably, the electric motor further includes a connector connected to the circuit board, and the connector is disposed outside the electric motor when viewed in an axial direction of the shaft. This makes it possible to keep the connector away from the magnetic sensor, and to suppress the influence of a magnetic field generated by the flow of current through the connector on the magnetic sensor.

Preferably, the circuit board further includes a heat sink for supporting the circuit board. This enables efficient heat dissipation of heat generated by the circuit board.

Preferably, the heat sink further includes a1 st bump, the 1 st bump facing at least one of the 1 st power circuit and the 2 nd power circuit and protruding toward the circuit substrate side. This enables heat generated in the 1 st power circuit and the 2 nd power circuit to be efficiently dissipated.

Preferably, the heat dissipating device further comprises a1 st heat dissipating material provided on the 1 st raised portion. This enables heat generated by the 1 st power circuit and the 2 nd power circuit to be dissipated more efficiently.

Preferably, the heat sink further includes a2 nd bump portion, the 2 nd bump portion being opposite to the control circuit and protruding toward the circuit substrate side. This enables heat generated by the control circuit to be efficiently dissipated.

Preferably, the heat dissipating device further comprises a2 nd heat dissipating material provided in the 2 nd raised portion. This enables heat generated by the control circuit to be dissipated more efficiently.

Preferably, the heat sink further includes a recess portion that faces the circuit board and is recessed toward an opposite side of the circuit board, and the capacitor disposed on the circuit board is accommodated in the recess portion. Thus, the thickness of the structure including the circuit board on which the capacitor is disposed and the heat sink can be reduced as compared with the case where the recess is not provided.

Preferably, the electric motor further includes an adapter disposed between the electric motor and the heat sink, and each of the 1 st coil wiring and the 2 nd coil wiring further includes a bent portion bent between the 1 st portion and the 2 nd portion, and the bent portion is disposed inside the adapter. This makes it possible to further separate the 1 st coil wiring and the 2 nd coil wiring from the magnetic sensor in the axial direction of the shaft.

Preferably, the adapter has a protruding portion protruding outward of the electric motor when viewed in an axial direction of the shaft, and the bent portion is disposed inward of the protruding portion. This makes it possible to further separate the 1 st coil wiring and the 2 nd coil wiring from the magnetic sensor in the direction intersecting the axial direction of the shaft.

Preferably, the heat sink has one of a concave portion and a convex portion, the adapter has the other of the concave portion and the convex portion, and the convex portion is fitted into the concave portion. Thereby, the adapter can be positioned with respect to the heat sink.

Preferably, the heat sink further includes a1 st adhesive disposed in the recess, and the heat sink and the adapter are bonded together by the 1 st adhesive. This ensures that the adapter does not detach from the heat sink.

As an ideal technical means, the method further comprises: a cover body covering the circuit board; and a quick-fit mechanism that fixes the cover to the heat sink, one of a locking portion and a locked portion of the quick-fit mechanism being provided on an outer peripheral portion of the cover, and the other of the locking portion and the locked portion being provided on the outer peripheral portion of the heat sink. This makes it possible to easily fix the cover and the heat sink together.

Preferably, the heat sink further includes a valve provided in the lid, the lid and the heat sink constitute a housing for housing the circuit board, and the valve is opened and closed according to a pressure difference between inside and outside of the housing. This can reduce the pressure change inside the housing due to the temperature change.

Preferably, the heat sink includes a groove portion provided in an outer peripheral portion of the heat sink, and the outer peripheral portion of the lid body is fittable into the groove portion. This enables the cover to be positioned with respect to the heat sink.

Preferably, the heat sink further includes a2 nd adhesive disposed in the groove portion, and the outer peripheral portion and the heat sink are bonded together by the 2 nd adhesive. Thereby, the cover and the heat sink are fixed together by both the quick-fit mechanism and the adhesive.

An electric power steering apparatus according to one aspect includes the electric drive device, and the electric drive device is capable of generating an assist steering torque. This can suppress a temperature increase of the magnetic sensor provided in the electric drive device.

An electric drive device according to another aspect includes: an electric motor including a shaft, a motor rotor interlocked with the shaft, a motor stator having a stator core for rotating the motor rotor, a plurality of coil groups divided into at least two systems of a1 st coil group and a2 nd coil group for every 3 phases and exciting the stator core with 3-phase alternating current, and a tubular case accommodating the motor rotor, the motor stator, and the plurality of coil groups inside; an electronic control device provided for driving and controlling the electric motor, the electronic control device including a magnet provided at an end portion of the shaft on a side opposite to a load, and a circuit board located on a side opposite to the load of the shaft and arranged on an extension line of an axial direction of the shaft; a1 st coil wiring connecting the 1 st coil group and the circuit board; a2 nd coil wiring connecting the 2 nd coil group and the circuit board; a heat sink having a1 st surface and a2 nd surface located on the opposite side of the 1 st surface, the heat sink supporting the circuit board on the 1 st surface side; and an annular wall portion disposed between the 1 st surface and the circuit board, the circuit board including: a detection circuit including a magnetic sensor that detects rotation of the magnet; a1 st power circuit including a plurality of electronic components that supply current to the 1 st coil group; a2 nd power circuit including a plurality of electronic components that supply current to the 2 nd coil group; and a control circuit including an electronic component that controls a current supplied to at least one of the 1 st power circuit and the 2 nd power circuit, wherein each of the 1 st coil wiring and the 2 nd coil wiring includes: a1 st portion protruding to an outside of the housing in a direction intersecting an axial direction of the shaft; and a2 nd portion protruding from the 1 st portion toward the circuit board on the outer side, wherein the heat sink has a through hole provided between the 1 st surface and the 2 nd surface and through which the shaft passes, and the through hole is located inside the ring of the wall portion when viewed in plan from an axial direction of the shaft.

The wall portion has an end portion on the circuit substrate side, and a cap can be attached to the end portion. This prevents foreign matter from entering the inside of the ring of the wall portion from the 1 st surface side of the heat sink. Since the magnet is positioned inside the ring of the wall portion, it is possible to suppress foreign matter from adhering to the magnet (contamination is generated).

Preferably, the present invention further comprises a plurality of ribs connecting the outer peripheral surface of the wall portion and the 1 st surface. This can improve the coupling strength between the wall portion and the heat sink.

Preferably, the plurality of ribs are arranged at equal intervals along the periphery of the wall portion. This ensures that the coupling strength between the wall portion and the heat sink does not vary around the wall portion.

Preferably, the magnetic circuit device further includes a cap attached to an end portion of the wall portion on the circuit substrate side, the cap having a top plate portion facing the magnet and an edge portion supporting an outer periphery of the top plate portion, and a material of the top plate portion is a resin. Thus, the magnetic flux emitted from the magnet can penetrate through the top plate portion of the cap, and the magnetic sensor can detect the magnetic flux. It is not necessary to remove the cap from the end of the wall portion in order to allow the magnetic flux to pass through. Therefore, in the assembly process of the electric drive device, the process of removing the cap is not required, and the increase of the number of processes can be suppressed. Further, even after the circuit board is mounted on the heat sink and the electric drive device is completed, the cap can be maintained in the state of being mounted on the end portion of the wall portion. This can continuously suppress the adhesion of foreign matter to the magnet.

Preferably, the wall portion has a groove portion provided on the outer peripheral surface, the rim portion has a protrusion portion provided at a position overlapping the groove portion, and the protrusion portion is engageable with the groove portion. This enables the cap to be fixed to the wall portion.

Preferably, the wall portion is formed integrally with the heat sink. This makes it possible to improve the strength of the connection between the wall and the heat sink because there is no boundary between the wall and the heat sink. The wall portion is made of the same material as the heat sink, and is made of, for example, metal. If the material of the wall portion is metal, the magnetic field can be shielded between the inside and the outside of the ring of the wall portion.

Preferably, the heat sink has a recess provided in the 1 st surface, and the wall portion is fittable into the recess. Thereby, the heat sink and the wall portion can be manufactured separately.

Preferably, the magnetic shield device further includes a magnetic shield layer provided on an inner peripheral surface of the wall portion. Thereby, even if the wall portion is made of resin, the magnetic field can be shielded between the inside and the outside of the ring of the wall portion.

An electric drive device according to still another aspect includes: an electric motor including a shaft, a motor rotor interlocked with the shaft, a motor stator having a stator core for rotating the motor rotor, a plurality of coil groups divided into at least two systems of a1 st coil group and a2 nd coil group for every 3 phases and exciting the stator core with 3-phase alternating current, and a tubular case accommodating the motor rotor, the motor stator, and the plurality of coil groups inside; an electronic control device provided for driving and controlling the electric motor, the electronic control device including a magnet provided at an end portion of the shaft on a side opposite to a load, and a circuit board located on a side opposite to the load of the shaft and arranged on an extension line of an axial direction of the shaft; a1 st coil wiring connecting the 1 st coil group and the circuit board; a2 nd coil wiring connecting the 2 nd coil group and the circuit board; a heat sink having a1 st surface and a2 nd surface located on the opposite side of the 1 st surface, the heat sink supporting the circuit board on the 1 st surface side; an annular wall portion disposed between the 1 st surface and the circuit board; and an elastic body disposed between the wall portion and the circuit board, the circuit board including: a detection circuit including a magnetic sensor that detects rotation of the magnet; a1 st power circuit including a plurality of electronic components that supply current to the 1 st coil group; a2 nd power circuit including a plurality of electronic components that supply current to the 2 nd coil group; and a control circuit including an electronic component that controls a current supplied to at least one of the 1 st power circuit and the 2 nd power circuit, wherein each of the 1 st coil wiring and the 2 nd coil wiring includes: a1 st portion protruding to an outside of the housing in a direction intersecting an axial direction of the shaft; and a2 nd portion protruding from the 1 st portion toward the circuit board on the outer side, wherein the heat sink has a through hole provided between the 1 st surface and the 2 nd surface and through which the shaft passes, and the through hole is located inside the ring of the wall portion when viewed in plan from an axial direction of the shaft.

An elastic body is disposed between the wall portion and the circuit board. By bringing the elastic body into close contact with the wall portion and the circuit board, respectively, vibration of the circuit board can be suppressed, and vibration of the magnetic sensor with respect to the magnet can be suppressed. This can further keep the distance between the magnetic sensor and the magnet constant. The magnetic sensor can accurately detect the rotation angle of the magnet.

Preferably, the elastic body has a ring shape, and the through hole is located inside the ring of the elastic body when viewed in plan from the axial direction of the shaft. Thus, when the elastic body is respectively adhered to the wall portion and the circuit board, the ring of the wall portion is closed by the circuit board. This prevents foreign matter from entering the inside of the ring of the wall portion from the 1 st surface side of the heat sink. Since the magnet is positioned inside the ring of the wall portion, it is possible to suppress foreign matter from adhering to the magnet (contamination is generated).

Preferably, the wall portion has a groove portion provided on a surface facing the circuit board, and the elastic body is fitted into the groove portion. This makes it easy to dispose the elastic body on the side of the wall portion facing the circuit board. The elastic body can be prevented from being displaced with respect to the wall portion.

Preferably, the elastomer is insulating. Thus, the elastic body can insulate the circuit board from the wall portion. For example, even in the case where the wall portion is made of metal, the elastic body can prevent current from flowing between the wall portion and the circuit substrate.

Preferably, the heat sink has a recess provided in the 1 st surface, and the wall portion is fittable into the recess. Thereby, the heat sink and the wall portion can be manufactured separately.

An electric drive device according to still another aspect includes: an electric motor including a shaft, a motor rotor interlocked with the shaft, a motor stator having a stator core for rotating the motor rotor, a plurality of coil groups divided into at least two systems of a1 st coil group and a2 nd coil group for every 3 phases and exciting the stator core with 3-phase alternating current, and a tubular case accommodating the motor rotor, the motor stator, and the plurality of coil groups inside; an electronic control device provided for driving and controlling the electric motor, the electronic control device including a magnet provided at an end portion of the shaft on a side opposite to a load, a circuit board located on a side opposite to the load of the shaft and arranged on an extension line of an axial direction of the shaft, a cover body covering the circuit board, and a connector connected to the circuit board; a1 st coil wiring connecting the 1 st coil group and the circuit board; and a2 nd coil wiring connecting the 2 nd coil group and the circuit board, the circuit board having: a detection circuit including a magnetic sensor that detects rotation of the magnet; a1 st power circuit including a plurality of electronic components that supply current to the 1 st coil group; a2 nd power circuit including a plurality of electronic components that supply current to the 2 nd coil group; and a control circuit including an electronic component that controls a current supplied to at least one of the 1 st power circuit and the 2 nd power circuit, wherein each of the 1 st coil wiring and the 2 nd coil wiring includes: a1 st portion protruding to an outside of the housing in a direction intersecting an axial direction of the shaft; and a2 nd portion protruding from the 1 st portion toward the circuit board on the outer side, the cover body having: a cover body main body; and an exterior part of the connector, which is formed integrally with the cover body.

As a desirable mode, the lid body includes: a1 st surface facing the circuit substrate; and a2 nd surface located on the opposite side of the 1 st surface, the exterior portion protruding from the 2 nd surface to the outside of the lid body. Thus, the signal transmission wiring located outside the electric drive device can be connected to the circuit board from the cover body side via the connector.

Preferably, the connector is separated from the 1 st coil wiring and the 2 nd coil wiring in a normal direction of the circuit board. Thus, in the circuit board, the region to which the connector is connected and the region to which the 1 st coil wiring or the 2 nd coil wiring is connected can be arranged separately from each other.

Preferably, the 1 st coil wiring and the 2 nd coil wiring are disposed adjacent to each other. This enables the 1 st power circuit and the 2 nd power circuit to be disposed adjacent to each other.

Preferably, when viewed from a normal direction of the circuit board, an arrangement position of the electronic component included in the control circuit is located on a side opposite to the 2 nd through hole with an arrangement position of the electronic component included in the 2 nd power circuit interposed therebetween. This makes it possible to separate the current path from the 2 nd power circuit to the electric motor from the control circuit.

Preferably, the connector is disposed outside the electric motor when viewed in an axial direction of the shaft. This makes it possible to keep the connector away from the magnetic sensor, and to suppress the influence of a magnetic field generated by the flow of current through the connector on the magnetic sensor.

Preferably, the circuit board further includes a heat sink for supporting the circuit board, and the cover is attached to the heat sink. This enables efficient heat dissipation of heat generated by the circuit board.

Preferably, the heat sink further includes a concave portion that faces the circuit board and is concave toward the opposite side of the circuit board, and the concave portion accommodates a capacitor disposed on the circuit board. Thus, the thickness of the structure including the circuit board on which the capacitor is disposed and the heat sink can be reduced as compared with the case where the recess is not provided.

Preferably, the heat sink further includes a quick-fit mechanism for fixing the cover to the heat sink, one of the locking portion and the locked portion of the quick-fit mechanism is provided on an outer peripheral portion of the cover, and the other of the locking portion and the locked portion is provided on the outer peripheral portion of the heat sink. This makes it possible to easily fix the cover and the heat sink together.

Preferably, the heat sink includes a groove portion provided in an outer peripheral portion of the heat sink, and the outer peripheral portion of the lid body is fittable into the groove portion. This makes it possible to position the lid body with respect to the heat sink by the groove portion.

ADVANTAGEOUS EFFECTS OF INVENTION

The present invention can provide an electric drive device and an electric power steering device that can suppress a temperature rise of a magnetic sensor.

Drawings

Fig. 1 is a perspective view schematically showing a vehicle on which an electric power steering apparatus according to embodiment 1 is mounted.

Fig. 2 is a schematic view of an electric power steering apparatus according to embodiment 1.

Fig. 3 is a schematic diagram showing a configuration example of the ECU of embodiment 1.

Fig. 4 is a cross-sectional view schematically showing a cross section of an electric motor according to embodiment 1.

Fig. 5 is a schematic diagram showing the wiring of the electric motor according to embodiment 1.

Fig. 6 is a schematic diagram showing the relationship between the electric motor and the ECU of embodiment 1.

Fig. 7 is a perspective view showing a configuration example of the electric drive device according to embodiment 1.

Fig. 8 is a plan view showing a configuration example of the electric drive device according to embodiment 1.

Fig. 9 is a bottom view showing a configuration example of the electric drive device according to embodiment 1.

Fig. 10 is an exploded perspective view showing a configuration example of an electric drive device according to embodiment 1.

Fig. 11 is an exploded perspective view showing a configuration example of an electric drive device according to embodiment 1.

Fig. 12 is an exploded perspective view showing a configuration example of an electric drive device according to embodiment 1.

Fig. 13 is a perspective view showing a configuration example of an ECU main body according to embodiment 1.

Fig. 14 is a plan view showing a configuration example of an ECU main body according to embodiment 1.

Fig. 15 is a bottom view showing a configuration example of an ECU main body according to embodiment 1.

Fig. 16 is an exploded perspective view showing a configuration example of an ECU main body according to embodiment 1.

Fig. 17A is a front view showing a configuration example of the circuit board according to embodiment 1.

Fig. 17B is a plan view showing a configuration example of the circuit board according to embodiment 1.

Fig. 17C is a bottom view showing a configuration example of the circuit board according to embodiment 1.

Fig. 17D is a left side view showing a configuration example of the circuit board according to embodiment 1.

Fig. 17E is a right side view showing a configuration example of the circuit board according to embodiment 1.

Fig. 17F is a rear view showing a configuration example of the circuit board according to embodiment 1.

Fig. 18 is a perspective view of the circuit board of embodiment 1 from the 2 nd surface side showing the electronic component mounted on the 1 st surface side.

Fig. 19 is a front view showing a structural example of the heat sink according to embodiment 1.

Fig. 20 is a rear view showing a configuration example of the heat sink according to embodiment 1.

Fig. 22 is a view showing a1 st raised part, a2 nd raised part and a recessed part provided on a1 st surface side of the heat sink of embodiment 1 and an electronic component mounted on a circuit board in a perspective view from the 2 nd surface side of the heat sink.

Fig. 23 is a cross-sectional view schematically showing a state in which a smoothing capacitor is disposed in a recess in an ECU main body according to embodiment 1.

Fig. 24 is a perspective view showing a cross section of the electric drive device taken along line a 1-a 2 in fig. 8.

Fig. 25 is a perspective view showing a configuration example of the 1 st coil wiring and the 2 nd coil wiring in embodiment 1.

Fig. 26 is a sectional view of the electric drive device taken along line A3-a 4 in fig. 9.

Fig. 27 is a sectional view of the electric drive device taken along line B1-B2 in fig. 9.

Fig. 28 is a perspective view showing an example of the quick attachment mechanism according to embodiment 1.

Fig. 29 is a schematic diagram showing a configuration of an electric drive device according to modification 1 of embodiment 1.

Fig. 30 is a schematic diagram showing a configuration of an electric drive device according to modification 2 of embodiment 1.

Fig. 31 is a sectional view showing the structure of a recess in modification 3 of embodiment 1.

Fig. 32 is an exploded perspective view showing a configuration example of an ECU main body according to embodiment 2.

Fig. 33 is a front view showing a configuration example of a heat sink according to embodiment 2.

Fig. 34 is a rear view showing a configuration example of a heat sink according to embodiment 2.

Fig. 35 is a view showing a1 st raised part, a2 nd raised part and a recessed part provided on a1 st surface side in a perspective view from the 2 nd surface side in the heat sink of embodiment 2.

Fig. 36 is a view showing a1 st raised part, a2 nd raised part and a recessed part provided on a1 st surface side of the heat sink of embodiment 2, and an electronic component mounted on a circuit board, as seen in perspective from the 2 nd surface side of the heat sink.

Fig. 37 is a sectional view showing a configuration example of an electric drive device according to embodiment 2.

Fig. 38 is an enlarged cross-sectional view of the wall portion and the periphery thereof in fig. 37.

Fig. 39 is a plan view showing a structural example of a wall portion and a plurality of ribs in embodiment 2.

Fig. 40A is a plan view showing a structural example of the cap according to embodiment 2.

Fig. 40B is a sectional view showing a structural example of the cap according to embodiment 2.

Fig. 40C is a bottom view showing a structural example of the cap according to embodiment 2.

Fig. 41 is a sectional view showing the structure of a cap according to modification 1 of embodiment 2.

Fig. 42 is a sectional view showing the structure of a cap according to modification 2 of embodiment 2.

Fig. 43A is a plan view showing the structure of a cap according to modification 2 of embodiment 2.

Fig. 43B is a sectional view showing the structure of a cap according to modification 2 of embodiment 2.

Fig. 43C is a bottom view showing the structure of a cap according to modification 2 of embodiment 2.

Fig. 44A is a cross-sectional view showing a wall portion and its periphery in modification 3 of embodiment 2.

Fig. 44B is a cross-sectional view showing a state in which a cap is attached to a wall portion of modification 3 of embodiment 2.

Fig. 45 is a cross-sectional view showing a wall portion and its periphery in modification 4 of embodiment 2.

Fig. 46 is an exploded perspective view showing a configuration example of an ECU main body according to embodiment 2.

Fig. 47 is a sectional view showing a configuration example of an electric drive device according to embodiment 3.

Fig. 48 is an enlarged cross-sectional view of the wall portion and the periphery thereof in fig. 47.

Fig. 49 is a plan view showing a structural example of the wall portion and the plurality of ribs in embodiment 3.

Fig. 50 is a cross-sectional view showing a wall portion and its periphery in a modification of embodiment 3.

Fig. 51 is a perspective view showing a configuration example of an electric drive device according to embodiment 4.

Fig. 52 is a plan view showing a configuration example of the electric drive device according to embodiment 4.

Fig. 53 is a bottom view showing a configuration example of an electric drive device according to embodiment 4.

Fig. 54 is an exploded perspective view showing a configuration example of an electric drive device according to embodiment 4.

Fig. 55 is an exploded perspective view showing a configuration example of an electric drive device according to embodiment 4.

Fig. 56 is an exploded perspective view showing a configuration example of an electric drive device according to embodiment 4.

Fig. 57 is a perspective view showing a configuration example of an ECU main body according to embodiment 4.

Fig. 58 is a bottom view showing a structural example of an ECU main body according to embodiment 4.

Fig. 59 is an exploded perspective view showing a configuration example of an ECU main body according to embodiment 4.

Fig. 60 is a schematic diagram showing an example of connection of a connector to a circuit board.

Fig. 61 is a schematic diagram showing an example of connection of a connector to a circuit board.

Fig. 62 is a front view showing a configuration example of a heat sink according to embodiment 4.

Fig. 63 is a rear view showing a configuration example of a heat sink according to embodiment 4.

Fig. 64 is a perspective view of the heat sink of embodiment 4 from the 2 nd surface side showing the 1 st raised part, the 2 nd raised part and the recessed part provided on the 1 st surface side.

Fig. 65 is a view showing the 1 st raised part, the 2 nd raised part, and the recessed part provided on the 1 st surface side of the heat sink of embodiment 4, and an electronic component mounted on a circuit board, as seen in perspective from the 2 nd surface side of the heat sink.

Fig. 66 is a perspective view showing a cross section of the electric drive device taken along line a 9-a 10 in fig. 52.

Fig. 67 is a sectional view of the electric drive device taken along line B3-B4 in fig. 53.

Fig. 68 is a perspective view showing an example of the quick attachment mechanism according to embodiment 4.

Detailed Description

A mode (embodiment) for carrying out the present invention will be described in detail with reference to the accompanying drawings. The present invention is not limited to the following embodiments. The structural elements described below include those easily suggested by those skilled in the art and substantially the same. Also, the structural elements described below can be combined as appropriate.

(embodiment mode 1)

Fig. 1 is a perspective view schematically showing a vehicle on which an electric power steering apparatus according to embodiment 1 is mounted. Fig. 2 is a schematic view of an electric power steering apparatus according to embodiment 1. As shown in fig. 1, a vehicle 101 is equipped with an electric power steering apparatus 100. An outline of the electric power steering apparatus 100 is described with reference to fig. 2.

The electric power steering apparatus 100 includes a steering wheel 91, a steering shaft 92, a universal joint 96, an intermediate shaft 97, a universal joint 98, a1 st rack and pinion mechanism 99, and a tie rod 72 in this order, in which force applied by a driver (operator) is transmitted. The electric power steering apparatus 100 includes a torque sensor 94 that detects a steering torque of the steering shaft 92, the electric motor 30, an electronic Control unit (hereinafter referred to as an ecu (electronic Control unit)) 10 that controls the electric motor 30, the reduction gear unit 75, and the 2 nd rack and pinion mechanism 70. The vehicle speed sensor 82, the power supply device 83 (for example, a vehicle-mounted battery), and the ignition switch 84 are provided on the vehicle body. The vehicle speed sensor 82 detects the running speed of the vehicle 101. Vehicle speed sensor 82 outputs detected vehicle speed signal SV to ECU10 through can (controller area network) communication. In a state where the ignition switch 84 is turned on, power is supplied from the power supply device 83 to the ECU 10.

The electric drive device 1 includes an electric motor 30 and an ECU10 fixed to the opposite side of the shaft 31 of the electric motor 30 from the load. The electric drive device 1 may further include an adapter 60 (see fig. 3) that connects the ECU10 and the electric motor 30.

As shown in fig. 2, the steering shaft 92 includes an input shaft 92A, an output shaft 92B, and a torsion bar 92C. The input shaft 92A has one end connected to the steering wheel 91 and the other end connected to the torsion bar 92C. The output shaft 92B has one end connected to the torsion bar 92C and the other end connected to the universal joint 96. Further, the torque sensor 94 detects the steering torque applied to the steering shaft 92 by detecting the torsion of the torsion bar 92C. The torque sensor 94 outputs a steering torque signal T corresponding to the detected steering torque to the ECU10 through CAN communication. The steering shaft 92 is rotated by a steering force applied to the steering wheel 91.

The intermediate shaft 97 has an upper shaft 97A and a lower shaft 97B for transmitting torque of the output shaft 92B. Upper shaft 97A is connected to output shaft 92B by universal joint 96. On the other hand, the lower shaft 97B is connected to a1 st pinion shaft 99A of a1 st rack-and-pinion mechanism 99 via a universal joint 98. The upper shaft 97A and the lower shaft 97B are spline-coupled, for example.

The 1 st rack and pinion mechanism 99 includes a1 st pinion shaft 99A, a1 st pinion 99B, a rack shaft 99C, and a1 st rack 99D. The 1 st pinion shaft 99A has one end connected to the lower shaft 97B via a universal joint 98 and the other end connected to the 1 st pinion 99B. The 1 st rack 99D formed on the rack shaft 99C meshes with the 1 st pinion 99B. The rotational motion of the steering shaft 92 is transmitted to the 1 st rack and pinion mechanism 99 via the intermediate shaft 97. This rotational motion is converted into linear motion of the rack shaft 99C by the 1 st rack and pinion mechanism 99. The tie rods 72 are connected to both ends of the rack shaft 99C, respectively.

The electric motor 30 is a motor that generates an assist steering torque for assisting the manipulation by the driver. The electric motor 30 may be a brushless motor or a brush motor having a brush and a commutator.

The ECU10 is provided with a rotation angle sensor 23 a. The rotation angle sensor 23a is used to detect the rotation phase of the electric motor 30. The ECU10 obtains a rotation phase signal of the electric motor 30 from the rotation angle sensor 23a, obtains a steering torque signal T from the torque sensor 94, and obtains a vehicle speed signal SV of the vehicle 101 from the vehicle speed sensor 82. The ECU10 calculates an assist steering command value of the assist command from the rotation phase signal, the steering torque signal T, and the vehicle speed signal SV. The ECU10 supplies electric current to the electric motor 30 based on the calculated assist steering command value.

The reduction gear 75 includes a worm 75A that rotates integrally with the shaft 31 of the electric motor 30 and a worm wheel 75B that meshes with the worm 75A. Thus, the rotational motion of the shaft 31 is transmitted to the worm wheel 75B via the worm 75A. In embodiment 1, a portion of the shaft 31 on the side of the reduction gear unit 75 is referred to as a load-side end portion, and a portion of the shaft 31 on the side opposite to the reduction gear unit 75 is referred to as a load-opposite-side end portion.

The 2 nd rack-and-pinion mechanism 70 has a2 nd pinion shaft 71A, a2 nd pinion 71B, and a2 nd rack 71C. The 2 nd pinion shaft 71A is fixed with one end portion coaxially and integrally rotated with the worm wheel 75B. The other end of the 2 nd pinion shaft 71A is connected to the 2 nd pinion 71B. The 2 nd rack 71C formed on the rack shaft 99C meshes with the 2 nd pinion 71B. The rotational motion of the electric motor 30 is transmitted to the 2 nd rack and pinion mechanism 70 via the reduction gear 75. This rotational motion is converted into linear motion of the rack shaft 99C by the 2 nd rack and pinion mechanism 70.

The steering force input to the steering wheel 91 by the driver is transmitted to the 1 st rack and pinion mechanism 99 via the steering shaft 92 and the intermediate shaft 97. The 1 st rack and pinion mechanism 99 transmits the transmitted steering force to the rack shaft 99C as a force in the axial direction applied to the rack shaft 99C. At this time, the ECU10 obtains the steering torque signal T input to the steering shaft 92 from the torque sensor 94. The ECU10 acquires a vehicle speed signal SV from the vehicle speed sensor 82. The ECU10 obtains a rotation phase signal of the electric motor 30 from the rotation angle sensor 23 a. Then, the ECU10 outputs a control signal to control the operation of the electric motor 30. The assist steering torque generated by the electric motor 30 is transmitted to the 2 nd rack and pinion mechanism 70 via the reduction gear 75. The 2 nd rack and pinion mechanism 70 transmits the assist steering torque to the rack shaft 99C as a force in the axial direction applied to the rack shaft 99C. In this way, the driver can be assisted by the electric power steering apparatus 100 when steering with the steering wheel 91.

Fig. 3 is a schematic diagram showing a configuration example of the ECU of embodiment 1. As shown in fig. 3, the electric drive device 1 including the ECU10, the electric motor 30, and the adapter 60 is disposed in the vicinity of the 1 st rack and pinion mechanism 99 and the 2 nd rack and pinion mechanism 70. As described above, the electric power steering apparatus 100 is of a rack assist type in which the assist force is given by the 2 nd rack-and-pinion mechanism 70, but is not limited thereto. The electric power steering apparatus 100 may be of a column assist type in which an assist force is given to the steering shaft 92 and a pinion assist type in which an assist force is given to the 1 st pinion 99B, for example.

Fig. 4 is a cross-sectional view schematically showing a cross section of an electric motor according to embodiment 1. Fig. 5 is a schematic diagram showing the wiring of the electric motor according to embodiment 1. As shown in fig. 4, the electric motor 30 includes a housing 930, a rotor 932, and a stator having a stator core 931. The stator includes a cylindrical stator core 931, a plurality of 1 st coils 37, and a plurality of 2 nd coils 38. The stator core 931 includes an annular back yoke 931a and a plurality of teeth 931b protruding from an inner peripheral surface of the back yoke 931 a. The number of the teeth 931b is 12 in the circumferential direction. The rotor 932 includes a rotor yoke 932a and a magnet 932 b. The magnet 932b is provided on the outer peripheral surface of the rotor yoke 932 a. The number of the magnets 932b is, for example, 8.

As shown in fig. 4, the 1 st coil 37 is wound around each of the teeth 931b of the plurality of teeth 931b in a concentrated manner. The 1 st coil 37 is wound around the outer periphery of the tooth 931b with an insulator interposed therebetween. All 1 st coils 37 are included in the 1 st coil system. The 1 st coil system according to embodiment 1 is excited by supplying a current to the inverter circuit 251 (see fig. 6) included in the 1 st power circuit 25A. The 1 st coil system comprises, for example, 61 st coils 37. The 61 st coils 37 are arranged such that two 1 st coils 37 are adjacent to each other in the circumferential direction. The 1 st coil group Gr1 including the 1 st coil 37 adjacent thereto is arranged at equal intervals in the circumferential direction by 3. That is, the 1 st coil system includes 31 st coil groups Gr1 arranged at equal intervals in the circumferential direction. Note that the number of the 1 st coil groups Gr1 is not necessarily 3, and when n is a natural number, 3n may be arranged at equal intervals in the circumferential direction. In addition, n is desirably an odd number.

As shown in fig. 4, the 2 nd coil 38 is wound around each of the teeth 931b of the plurality of teeth 931b in a concentrated manner. The 2 nd coil 38 is wound around the outer periphery of the tooth 931b with an insulator interposed therebetween. The tooth 931b around which the 2 nd coil 38 is concentratedly wound is a tooth 931b different from the tooth 931b around which the 1 st coil 37 is concentratedly wound. All 2 nd coils 38 are contained in the 2 nd coil system. The 2 nd coil system is excited by supplying a current to the inverter circuit 251 (see fig. 6) included in the 2 nd power circuit 25B. The 2 nd coil system comprises, for example, 62 nd coils 38. The 62 nd coils 38 are arranged such that two 2 nd coils 38 are adjacent to each other in the circumferential direction. The 2 nd coil group Gr2 having the adjacent 2 nd coil 38 as the 1 st group is arranged at 3 equally spaced intervals in the circumferential direction. That is, the 2 nd coil system includes 32 nd coil groups Gr2 arranged at equal intervals in the circumferential direction. Note that the number of the 2 nd coil groups Gr2 is not necessarily 3, and when n is a natural number, 3n may be arranged at equal intervals in the circumferential direction. In addition, n is desirably an odd number.

As shown in fig. 5, the 61 st coils 37 include two 1U-th phase coils 37Ua and 37Ub excited by the 1U-th phase current I1U, two 1V-th phase coils 37Va and 37Vb excited by the 1V-th phase current I1V, and two 1W-th phase coils 37Wa and 37Wb excited by the 1W-th phase current I1W. The 1U-th phase coil 37Ub is connected in series with respect to the 1U-th phase coil 37 Ua. The 1 st V-phase coil 37Vb is connected in series with respect to the 1 st V-phase coil 37 Va. The 1W-th phase coil 37Wb is connected in series with the 1W-th phase coil 37 Wa. The winding direction of the 1 st coil 37 with respect to the tooth portion 931b is the same. Further, the 1U-phase coil 37Ub, the 1V-phase coil 37Vb, and the 1W-phase coil 37Wb are joined by star connection (Y connection).

As shown in fig. 5, the 62 nd coils 38 include two 2U-th phase coils 38Ua and 38Ub excited by the 2U-th phase current I2U, two 2V-th phase coils 38Va and 38Vb excited by the 2V-th phase current I2V, and two 2W-th phase coils 38Wa and 38Wb excited by the 2W-th phase current I2W. The 2U-th phase coil 38Ub is connected in series with respect to the 2U-th phase coil 38 Ua. The 2V-th phase coil 38Vb is connected in series with respect to the 2V-th phase coil 38 Va. The 2W-th phase coil 38Wb is connected in series with the 2W-th phase coil 38 Wa. The winding direction of the 2 nd coil 38 with respect to the tooth portions 931b is the same, and is the same as the winding direction of the 1 st coil 37. Further, the 2U-phase coil 38Ub, the 2V-phase coil 38Vb, and the 2W-phase coil 38Wb are joined by star connection (Y connection).

As shown in fig. 4, the 31 st coil groups Gr1 are composed of a1 st UV coil group Gr1UV, a1 st VW coil group Gr1VW, and a1 st UW coil group Gr1 UW. The 1 st UV coil group Gr1UV includes a 1U-phase coil 37Ub and a 1V-phase coil 37Va that are circumferentially adjacent to each other. The 1VW coil group Gr1VW includes a 1V-th phase coil 37Vb and a 1W-th phase coil 37Wa which are adjacent to each other in the circumferential direction. The 1 UW-th coil group Gr1UW includes a 1U-th phase coil 37Ua and a 1W-th phase coil 37Wb that are adjacent to each other in the circumferential direction.

As shown in fig. 4, the 32 nd coil groups Gr2 are composed of a2 nd UV coil group Gr2UV, a2 nd VW coil group Gr2VW, and a 2UW coil group Gr2 UW. The 2 nd UV coil group Gr2UV includes the 2U-phase coil 38Ub and the 2V-phase coil 38Va that are circumferentially adjacent to each other. The 2VW coil group Gr2VW includes the 2V-th phase coil 38Vb and the 2W-th phase coil 38Wa which are adjacent to each other in the circumferential direction. The 2 UW-th coil group Gr2UW includes the 2U-th phase coil 38Ua and the 2W-th phase coil 38Wb that are circumferentially adjacent to each other.

The 1 st coil 37 excited by the 1 st U-phase current I1U is opposed to the 2 nd coil 38 excited by the 2 nd U-phase current I2U in the radial direction of the stator core 931. In the following description, the radial direction of the stator core 931 is simply referred to as the radial direction. For example, as shown in fig. 4, the 1U-th phase coil 37Ua is opposed to the 2U-th phase coil 38Ua, and the 1U-th phase coil 37Ub is opposed to the 2U-th phase coil 38Ub in the radial direction.

The 1 st coil 37 excited by the 1 st V-phase current I1V is radially opposed to the 2 nd coil 38 excited by the 2 nd V-phase current I2V. For example, as shown in fig. 4, the 1 st V-phase coil 37Va and the 2 nd V-phase coil 38Va are opposed to each other, and the 1 st V-phase coil 37Vb and the 2 nd V-phase coil 38Vb are opposed to each other in the radial direction.

The 1 st coil 37 excited by the 1W-th phase current I1W is radially opposed to the 2 nd coil 38 excited by the 2W-th phase current I2W. For example, as shown in fig. 4, the 1W-th phase coil 37Wa is opposed to the 2W-th phase coil 38Wa, and the 1W-th phase coil 37Wb is opposed to the 2W-th phase coil 38Wb in the radial direction.

Fig. 6 is a schematic diagram showing the relationship between the electric motor and the ECU of embodiment 1. As shown in fig. 6, the ECU10 includes the detection circuit 23, the control circuit 24, the 1 st power circuit 25A, and the 2 nd power circuit 25B. The detection circuit 23 includes a rotation angle sensor 23a and a motor rotation speed calculation unit 23 b. The control circuit 24 includes a control arithmetic unit 241, a gate drive circuit 242, and a blocking drive circuit 243. The 1 st power circuit 25A has an inverter circuit 251 and a current block circuit 255. The 2 nd power circuit 25B has an inverter circuit 251 and a current block circuit 255. The inverter circuit 251 has a plurality of switching elements 252 and a current detection circuit 254 for detecting a current value.

The control calculation unit 241 calculates a motor current command value. The motor rotation speed calculation unit 23b calculates the motor electrical angle θ m and outputs the motor electrical angle θ m to the control calculation unit 241. The motor current command value output from the control calculation unit 241 is input to the gate drive circuit 242. The gate drive circuit 242 controls the 1 st power circuit 25A and the 2 nd power circuit 25B according to the motor current command value.

As shown in fig. 6, the ECU10 includes a rotation angle sensor 23 a. The rotation angle sensor 23a is, for example, a magnetic sensor. The detection value of the rotation angle sensor 23a is supplied to the motor rotation speed calculation unit 23 b. The motor rotation speed calculation unit 23b calculates a motor electrical angle θ m based on the detection value of the rotation angle sensor 23a, and outputs the motor electrical angle θ m to the control calculation unit 241.

The steering torque signal T detected by the torque sensor 94, the vehicle speed SV detected by the vehicle speed sensor 82, and the motor electrical angle θ m output from the motor rotational speed calculation unit 23b are input to the control calculation unit 241. The control arithmetic unit 241 calculates a motor current command value from the steering torque signal T, the vehicle speed SV, and the motor electrical angle θ m, and outputs the motor current command value to the gate drive circuit 242.

The gate drive circuit 242 calculates the 1 st pwm signal from the current command value, and outputs the signal to the inverter circuit 251 of the 1 st power circuit 25A. The inverter circuit 251 switches the switching element 252 so as to have a current value of 3 phases in accordance with the duty ratio of the 1 st pulse width modulation signal, and generates 3-phase ac including the 1 st U-phase current I1U, the 1 st V-phase current I1V, and the 1 st W-phase current I1W. The 1U-th phase current I1U excites the 1U-th phase coil 37Ua and the 1U-th phase coil 37Ub, the 1V-th phase current I1V excites the 1V-th phase coil 37Va and the 1V-th phase coil 37Vb, and the 1W-th phase current I1W excites the 1W-th phase coil 37Wa and the 1W-th phase coil 37 Wb.

The gate drive circuit 242 calculates the 2 nd pwm signal from the current command value, and outputs the signal to the inverter circuit 251 of the 2 nd power circuit 25B. The inverter circuit 251 switches the switching element 252 so as to have a current value of 3 phases in accordance with the duty ratio of the 2 nd pulse width modulation signal, and generates 3-phase ac including the 2U-th phase current I2U, the 2V-th phase current I2V, and the 2W-th phase current I2W. The 2U-th phase current I2U excites the 2U-th phase coil 38Ua and the 2U-th phase coil 38Ub, the 2V-th phase current I2V excites the 2V-th phase coil 38Va and the 2V-th phase coil 38Vb, and the 2W-th phase current I2W excites the 2W-th phase coil 38Wa and the 2W-th phase coil 38 Wb.

The inverter circuit 251 is a power conversion circuit that converts dc power into ac power. As described above, the inverter circuit 251 includes the plurality of switching elements 252. The switching element 252 is, for example, a field effect transistor. The smoothing capacitor 253 is connected in parallel to the inverter circuit 251. The smoothing capacitor 253 is, for example, an electrolytic capacitor. The circuit board 20 includes two electrolytic capacitors 253A and 253B (see fig. 17F) connected in parallel as the smoothing capacitor 253.

As described above, the inverter circuit 251 includes the current detection circuit 254. The current detection circuit 254 includes, for example, a shunt resistor. The current value detected by the current detection circuit 254 is sent to the control calculation unit 241. The current detection circuit 254 may be connected to detect the current value of each phase of the electric motor 30.

The current blocking circuit 255 is disposed between the inverter circuit 251 and the 1 st coil 37 or between the inverter circuit 251 and the 2 nd coil 38. When it is determined that the current value detected by the current detection circuit 254 is abnormal, the control calculation unit 241 drives the current interruption circuit 255 via the interruption drive circuit 243 to interrupt the current flowing from the inverter circuit 251 to the 1 st coil 37. The control arithmetic unit 241 drives the current interruption circuit 255 through the interruption drive circuit 243, and can interrupt the current flowing from the inverter circuit 251 to the 2 nd coil 38. In this way, the current flowing through the 1 st coil 37 and the current flowing through the 2 nd coil 38 are independently controlled by the control arithmetic unit 241. Input/output signals such as the steering torque signal T and the vehicle speed signal SV are transmitted to the control calculation unit 241 via the connector CNT.

Fig. 7 is a perspective view showing a configuration example of the electric drive device according to embodiment 1. Fig. 8 is a plan view showing a configuration example of the electric drive device according to embodiment 1. Fig. 9 is a bottom view showing a configuration example of the electric drive device according to embodiment 1. Fig. 10 to 12 are exploded perspective views showing a configuration example of an electric drive device according to embodiment 1. As shown in fig. 7 to 12, the electric drive device 1 includes an electric motor 30, an ECU10 disposed on the opposite side of the electric motor 30 from the load, and an adapter 60 disposed between the ECU10 and the electric motor 30. The electric motor 30 includes a housing 930. The case 930 is cylindrical, and houses therein: a rotor 932 (see fig. 4), a stator including a1 st coil group Gr1 and a2 nd coil group Gr2 (see fig. 4), and a shaft 31. A magnet 32 is attached to an end of the shaft 31 on the opposite side to the load.

The adapter 60 has a circular ring portion 61 and a protruding portion 62 protruding from the circular ring portion 61 in a direction intersecting the axial direction Ax of the shaft 31. The circular portion 61 and the protruding portion 62 are formed integrally. The adapter 60 is provided with an insertion hole 60H1 through which a bolt for fixing the adapter 60 to the heat sink 40 is inserted. The insertion holes 60H1 are provided with 4 pieces, for example. The adapter 60 is provided with an insertion hole 60H2 through which the pin 45CP provided in the heat sink 40 is inserted. The insertion holes 60H2 are provided in two, for example. The adapter 60 is aligned with the heat sink 40 by passing the pins 45CP through the two insertion holes 60H2, respectively.

Further, a recess 60L is provided on the surface of the adapter 60 facing the heat sink 40. The recess 60L has a ring shape formed by the linear portion 60L1 and the curved portion 60L2 when viewed from the Z-axis direction. The ring formed by the recess 60L has a gentle shape without any edge. The adapter 60 is made of metal having high heat dissipation, such as aluminum or copper. Thus, the adapter 60 can assist the heat radiation of the radiator 40 or efficiently radiate the heat generated by the electric motor 30 to the outside. In embodiment 1, the adapter 60 is not limited to being made of metal, and may be made of resin.

Fig. 13 is a perspective view showing a configuration example of an ECU main body according to embodiment 1. Fig. 14 is a plan view showing a configuration example of an ECU main body according to embodiment 1. Fig. 15 is a bottom view showing a configuration example of an ECU main body according to embodiment 1. Fig. 16 is an exploded perspective view showing a configuration example of an ECU main body according to embodiment 1. The broken line in fig. 16 indicates a current path from the power supply terminals Tdc and Tgnd to the electric motor 30 (see fig. 10) via the ECU body 10A. As shown in fig. 13 to 16, the ECU10 includes the ECU main body 10A and the lid 50 (see fig. 7). The ECU main body 10A includes a circuit board 20, a heat sink 40 supporting the circuit board 20, and a connector CNT. The circuit substrate 20 and the connector CNT are mounted to the heat sink 40. The connector CNT is connected to the circuit substrate 20 from the outside of the heat sink 40. The connector CNT is disposed outside the electric motor 30 when viewed from the Z-axis direction.

The circuit board 20 includes a board main body 21 and a plurality of electronic components mounted on the board main body 21. The substrate main body 21 is, for example, a printed circuit board formed of resin or the like. The plurality of electronic components mounted on the 1 substrate main body 21 include, for example, a Central Processing Unit (CPU), an Application Specific Integrated Circuit (ASIC), a Field Effect Transistor (FET), a magnetic sensor, an electrolytic capacitor, a resistance element, a diode, a thermistor, and the like. The detection circuit 23, the control circuit 24, the 1 st power circuit 25A, and the 2 nd power circuit 25B shown in fig. 6 are configured by the plurality of electronic components.

As shown in fig. 16, the connector CNT includes a power supply terminal Tdc, a power supply terminal Tgnd, a CAN terminal Tcan for CAN communication, and an input/output terminal Tio for inputting and outputting data by a method other than CAN communication. The power supply terminal Tdc is a metal terminal for supplying a power supply voltage Vdc to the power supply device 83 (see fig. 2). The power supply terminal Tgnd is a metal terminal for supplying a negative power supply voltage (for example, a reference voltage such as ground) of the power supply device 83. Power wires PW (see fig. 2) for transmitting power from power supply device 83 are connected to power supply terminals Tdc and Tgnd in 1 st power circuit 25A and 2 nd power circuit 25B, respectively. The CAN terminal Tcan and the input/output terminal Tio are each a metal terminal. The signal transmission wiring for transmitting input and output signals such as the steering torque signal T and the vehicle speed signal SV is connected to the control arithmetic unit 241 of the control circuit 24 via the CAN terminal Tcan and the input/output terminal Tio (see fig. 6). In addition, the connector CNT is provided with an insertion hole CNTH through which a bolt for fixing the connector CNT to the heat sink 40 is inserted. Further, the connector CNT is provided with a projection CNTL on a surface thereof facing the heat sink 40. When viewed from the Z-axis direction, protruding portion CNTL surrounds power supply terminal Tdc, power supply terminal Tgnd, CAN terminal Tcan, and input/output terminal Tio.

As shown in fig. 9, the connector CNT is arranged such that the longitudinal direction thereof is in the Y direction when viewed from the Z direction. The planar shape of the housing 930 of the electric motor 30 is a perfect circle when viewed from the Z direction. The length of the heat sink 40 in the Y direction is L11, and the length of the connector CNT in the Y direction is L12. Further, the diameter of the case 930 is L13. As shown in fig. 9, the length L12 of the connector CNT is greater than the diameter L13 of the housing 930. In addition, the length L11 of the heat sink 40 is greater than the length L12 of the connector CNT. The results were L11 > L12 > L13.

Fig. 17A is a front view showing a configuration example of the circuit board according to embodiment 1. Fig. 17B is a plan view showing a configuration example of the circuit board according to embodiment 1. Fig. 17C is a bottom view showing a configuration example of the circuit board according to embodiment 1. Fig. 17D is a left side view showing a configuration example of the circuit board according to embodiment 1. Fig. 17E is a right side view showing a configuration example of the circuit board according to embodiment 1. Fig. 17F is a rear view showing a configuration example of the circuit board according to embodiment 1.

As shown in fig. 17A to 17F, the substrate main body 21 has a1 st surface 21a and a2 nd surface 21b located on the opposite side of the 1 st surface 21 a. The detection circuit 23, the control circuit 24, the 1 st power circuit 25A, and the 2 nd power circuit 25B are constituted by 1 or more electronic components mounted on the 1 st surface 21a or the 2 nd surface 21B. For example, as shown in fig. 17F, the detection circuit 23 is constituted by 1 electronic component mounted on the 2 nd surface 21b of the substrate main body 21.

As shown in fig. 17A and 17F, the control circuit 24 is composed of a plurality of electronic components mounted on the 1 st surface 21a and the 2 nd surface 21b of the substrate main body 21, respectively. For example, the control arithmetic unit 241 (see fig. 6) included in the control circuit 24 is composed of the electronic component 281 mounted on the 1 st surface 21 a. The electronic component 281 is a CPU. The gate driver circuit 242 (see fig. 6) included in the control circuit 24 is composed of electronic components 282A and 282B mounted on the 2 nd surface 21B. The electronic components 282A, 282B are ASICs.

As shown in fig. 17A, the 1 st power circuit 25A is composed of a plurality of electronic components mounted on the 1 st surface 21a of the board main body 21. For example, the inverter circuit 251 (see fig. 6) included in the 1 st power circuit 25A includes 6 electronic components 291 that function as the switching elements 252 (see fig. 6) and 3 electronic components 292 that function as the current detection circuit 254 (see fig. 6). The electronic component 291 is an FET. The electronic component 292 is a resistance element (shunt resistance). The current blocking circuit 255 (see fig. 6) included in the 1 st power circuit 25A is configured by 3 electronic components 291.

Similarly to the 1 st power circuit 25A, the 2 nd power circuit 25B is also configured by a plurality of electronic components mounted on the 1 st surface 21a of the board main body 21. For example, the inverter circuit 251 included in the 2 nd power circuit 25B includes 6 electronic components 291 each functioning as a switching element 252 and 3 electronic components 292 each functioning as a current detection circuit 254. The current blocking circuit 255 included in the 2 nd power circuit 25B is composed of 3 electronic components 291.

As shown in fig. 17A to 17E, the circuit board 20 includes a choke coil 49 mounted on the 1 st surface 21a of the board main body 21. The choke coil 49 removes a high-frequency component from the power wiring PW of the power supply device 83. As shown in fig. 17B to 17F, the circuit board 20 includes electrolytic capacitors 253A and 253B mounted on the 2 nd surface 21B of the board main body 21.

As shown in fig. 16, 17A, and 17F, the substrate main body 21 is provided with a plurality of through holes 21H1, 21H2, 21H3, 21H6, and 21H7 that penetrate the substrate main body 21 between the 1 st surface 21a and the 2 nd surface 21 b. In addition, the via 21H6 includes the 1 st via 21H6A and the 2 nd via 21H 6B. The through hole 21H7 includes through holes Hdc, Hgnd, Hcan, and Hio. The through holes 21H1 are for insertion of screws for fixing the circuit substrate 20 to the heat sink 40. The through hole 21H2 is used for inserting a rod-shaped coupling member CNTAL for aligning the connector CNT with respect to the circuit board 20. The through hole 21H3 is used for inserting a rod-shaped connecting member 66AL (see fig. 24) for positioning the 1 st coil wiring 321A, 322A, 323A and the 2 nd coil wiring 321B, 322B, 323B (see fig. 25) with respect to the circuit board 20. The 1 st through hole 21H6A is inserted with the 1 st coil wiring 321A, 322A, 323A and the 2 nd coil wiring 321B, 322B, 323B (see fig. 25). The 2 nd through hole 21H6B is inserted with the 2 nd coil wiring 321B, 322B, 323B (see fig. 25).

In addition, the through hole Hdc power supply terminal Tdc is inserted. The through hole Hgnd is inserted by the power supply terminal Tgnd. The through hole Hcan is inserted with the CAN terminal Tcan. The through hole Hio is for the input/output terminal Tio to be inserted.

The heat sink 40 supports the circuit substrate 20. The circuit board 20 is fixed to one surface (1 st surface) 40a side of the heat sink 40. The heat sink 40 is made of metal such as aluminum or copper having high heat dissipation properties, and efficiently dissipates heat generated from the circuit board 20 to the outside.

Fig. 18 is a perspective view of the circuit board of embodiment 1 from the 2 nd surface side showing the electronic component mounted on the 1 st surface side. In the circuit board 20 of embodiment 1, the positional relationship among the detection circuit 23, the control circuit 24, the 1 st power circuit 25A, the 2 nd power circuit 25B, the electrolytic capacitor 253A, and the electrolytic capacitor 253B is as follows, for example. As shown in fig. 18, when viewed from the normal direction (for example, the Z-axis direction) of the circuit board 20, the arrangement position of the electronic components 291 and 292 included in the 1 st power circuit 25A exists between the arrangement position of the detection circuit 23 and the 1 st through hole 21H 6A. Similarly, when viewed in the Z-axis direction, the arrangement positions of the electronic components 291 and 292 included in the 2 nd power circuit 25B are located between the arrangement position of the detection circuit 23 and the 2 nd through hole 21H 6B.

Further, when viewed from the Z-axis direction, the arrangement position of the electronic component 282A included in the control circuit 24 is located on the opposite side of the 1 st through hole 21H6A with the arrangement positions of the electronic components 291 and 292 included in the 1 st power circuit 25A interposed therebetween. Similarly, when viewed from the Z-axis direction, the arrangement position of the electronic component 282B included in the control circuit 24 is located on the opposite side of the 2 nd through hole 21H6B with the arrangement positions of the electronic components 291 and 292 included in the 2 nd power circuit 25B interposed therebetween.

Further, when viewed in the Z-axis direction, the arrangement position of the detection circuit 23 is located on the opposite side of the arrangement position of the electronic components 291 and 292 included in the 1 st power circuit 25A or the 2 nd power circuit 25B with the arrangement positions of the electrolytic capacitors 253A and 253B interposed therebetween. Further, when viewed from the Z-axis direction, the arrangement position of the detection circuit 23 is located on the opposite side of the arrangement position of the electronic components 291 and 292 included in the 1 st power circuit 25A or the 2 nd power circuit 25B with respect to a straight line 20CL passing through the center of the circuit board 20.

In addition, a1 st through hole 21H6A and a2 nd through hole 21H6B are provided on a side divided by a straight line 20CL passing through the center of the circuit substrate 20. Thus, the 2 nd portion WP2 (see fig. 25 described later) of the 1 st coil wire 321A, 322A, 323A and the 2 nd portion WP2 (see fig. 25 described later) of the 2 nd coil wire 321B, 322B, 323B are arranged offset to one side defined by the straight line 20CL passing through the center of the circuit board 20.

Fig. 19 is a front view showing a structural example of the heat sink according to embodiment 1. Fig. 20 is a rear view showing a configuration example of the heat sink according to embodiment 1. As shown in fig. 16 to 20, the heat sink 40 has a substantially rectangular shape in plan view (hereinafter, referred to as a planar shape). The heat sink 40 has a1 st surface 40a and a2 nd surface 40b located on the opposite side of the 1 st surface 40 a. The heat sink 40 has a1 st raised part 411 and 2 nd raised parts 412A and 412B provided on the bottom part 41 of the 1 st surface 40 a. The 1 st bump 411 is provided at a position overlapping with the 1 st power circuit 25A or the 2 nd power circuit 25B (see fig. 17A) in the Z-axis direction. For example, the electronic components 291 and 292 constituting the 1 st power circuit 25A and the 2 nd power circuit 25B are mounted on the 1 st surface 21a of the board main body 21 (see fig. 17A). The 1 st bump 411 is provided on the opposite side of the electronic components 291 and 292 constituting the 1 st power circuit 25A or the 2 nd power circuit 25B with the substrate main body 21 (see fig. 17A) interposed therebetween. The 1 st bump 411 has a recess 411a for accommodating a thermistor 283 (see fig. 17F) mounted on the 2 nd surface 21b of the board main body 21. When the circuit board 20 is mounted on the heat sink 40, the thermistor 283 is disposed in the recess 411 a.

The 2 nd bump 412A is provided at a position facing the electronic component 282A (fig. 17F) constituting the gate driver circuit 242. The 2 nd bump 412B is provided at a position facing the electronic component 282B (see fig. 17F) constituting the gate driver circuit 242.

As shown in fig. 16 and 19, a1 st heat dissipating material 431 is provided on the surface of the 1 st raised portion 411 facing the circuit board 20. Further, the 2 nd heat dissipating member 432 is provided on the surface of the 2 nd bump portion 412A or 412B facing the circuit board 20. For example, heat spreader material 1 431 and heat spreader material 2 432 are materials that are a mixture of silicone polymers with thermally conductive fillers, also known as TIM (thermal Interface material) or heat spreader grease.

TIM is applied to the surface of the 1 st raised portion 411 facing the circuit board 20 and the surfaces of the 2 nd raised portions 412A and 412B facing the circuit board 20. The 1 st bump 411 and the 2 nd bumps 412A and 412B are in contact with the circuit board 20 via TIM. Thus, the ECU10 can efficiently dissipate heat generated by the 1 st power circuit 25A, the 2 nd power circuit 25B, or the gate driver circuit 242 to the heat sink 40 via the TIM. Further, a gap exists between the 1 st bump 411 and the electronic component including the detection circuit 23, and a gap exists between the 2 nd bumps 412A and 412B and the electronic component including the detection circuit 23. Therefore, even if the TIM is pressed and spread between the 1 st bump portion 411 and the circuit board 20 and between the 2 nd bump portions 412A and 412B and the circuit board 20, the TIM does not come into contact with the electronic component including the detection circuit 23.

The heat sink 40 has recesses 413A and 413B provided in the bottom 41 of the 1 st surface 40 a. The recess 413A is provided at a position facing the electrolytic capacitor 253A (see fig. 17F). The concave portion 413B is provided at a position facing the electrolytic capacitor 253B (see fig. 17F). When the circuit board 20 is mounted on the heat sink 40, the electrolytic capacitor 253A is disposed in the recess 413A, and the electrolytic capacitor 253B is disposed in the recess 413B.

The heat sink 40 has a plurality of screw holes 41H provided in the 1 st surface 40 a. The screw holes 41H are inserted with screws for fixing the circuit board 20 (see fig. 16) to the heat sink 40. A thread is provided on the inner peripheral surface of the threaded hole 41H.

The heat sink 40 has a through hole 46 through which the shaft 31 (see fig. 10) of the electric motor 30 passes. The through hole 46 is provided at a position facing the electronic component including the detection circuit 23. The 2 nd raised parts 412A and 412B are disposed on both sides of the through hole 46.

The heat sink 40 has through holes 47A, 47B, 47C. The through hole 47A is inserted with the power supply terminals Tdc and Tgnd (see fig. 16). The through hole 47B is inserted with the CAN terminal Tcan (refer to fig. 16). The through hole 47C is inserted with an input/output terminal Tio (see fig. 16). In addition, the heat sink 40 has a through hole 48. The through hole 48 is inserted with the 1 st coil wiring 321A, 322A, 323A and the 2 nd coil wiring 321B, 322B, 323B (see fig. 10).

As shown in fig. 20, the heat sink 40 has a convex portion 40L provided on the bottom portion 45 of the 2 nd surface 40 b. The shape and size of the projection 40L correspond to those of the recess 60L (see fig. 11) of the adapter 60. Specifically, the convex portion 40L has a ring shape formed by the linear portion 40L1 and the curved portion 40L2 when viewed from the Z-axis direction. The connecting portion 40L12 connecting the linear portion 40L1 and the curved portion 40L2 is curved. Further, the connection portion 40L11 between the straight portions 40L1 also forms a curve. Thus, the ring formed by the convex portion 40L has a gentle shape without an edge. By fitting the convex portion 40L into the concave portion 60L, the adapter 60 is positioned with high accuracy with respect to the heat sink 40.

The inner region 451 surrounded by the projection 40L is provided at a position facing the adapter 60 (see fig. 10). The adapter 60 is disposed between the radiator 40 and the electric motor 30. The planar shape of the inner region 451 substantially matches the planar shape of the mounted surface of the adapter 60. The size of the inner area 451 in plan view is slightly larger than the size of the adapter 60 to which it is attached in plan view. The inner region 451 includes a1 st inner region 451A having a circular shape and a2 nd inner region 451B connected to the peripheral edge of the 1 st inner region 451A. The 1 st inner side zone 451A is located at a position overlapping the electric motor 30 and the 2 nd inner side zone 451B is located at a position shifted from the electric motor 30 when viewed from the Z-axis direction.

An O-ring 456 may be disposed along the projection 40L on the outer peripheral portion of the projection 40L. As described above, since the ring formed by the convex portion 40L has a gentle shape, the O-ring 456 can be disposed in close contact with the side surface of the convex portion 40L. Further, the 1 st adhesive 656 (see fig. 11) is disposed in the recess 60L of the adaptor 60 at a position corresponding to the projection 40L. By disposing the O-ring 456 and the 1 st adhesive 656 around the projection 40L, the adhesion between the heat sink 40 and the adapter 60 can be improved, and the sealing performance of the inner region 451 can be improved.

The heat sink 40 has a recess 41L provided in the bottom 45 of the 2 nd surface 40 b. The shape and size of the concave portion 41L correspond to those of a convex portion CNTL (see fig. 16) of the connector CNT. The convex portion CNTL is fitted into the concave portion 41L, and the connector CNT is mounted on the heat sink 40. An O-ring may be disposed on the outer peripheral portion of the recess 41L, which is not shown. Further, an adhesive may be disposed in the recess 41L. This can improve the adhesion between the heat sink 40 and the connector CNT, and can improve the sealing property of the inner region 452 surrounded by the recess 41L.

The heat sink 40 has a plurality of screw holes 45H1 and a plurality of screw holes 45H2 provided on the 2 nd surface 40 b. The screw holes 45H1 are for insertion of screws for fixing the adapter 60 to the heat sink 40. The screw holes 45H2 are for insertion of screws for fixing the connector CNT to the heat sink 40. Screw threads are provided on the inner peripheral surfaces of the screw holes 45H1 and 45H2, respectively. The heat sink 40 has pins 45CP provided on the 2 nd surface 40 b. For example, two pins 45CP are provided. The pin 45CP is provided at a position facing the insertion hole 60H2 (see fig. 12) of the adapter 60.

The heat sink 40 has an outer peripheral portion 42 surrounding the bottom portions 41, 45. As shown in fig. 19, outer peripheral portion 42 includes outer peripheral portion 42UE located on the upper side in plan view, outer peripheral portion 42BE located on the lower side in plan view, outer peripheral portion 42LE located on the left side in plan view, and outer peripheral portion 42RE located on the right side in plan view. The groove portions 422 are continuously provided in the outer peripheral portions 42UE, 42LE, 42BE, and 42RE of the 1 st surface 40 a.

Fig. 21 is a view showing a1 st raised part, a2 nd raised part and a recessed part provided on a1 st surface side in a perspective view from the 2 nd surface side in the heat sink according to embodiment 1. Fig. 22 is a view showing a1 st raised part, a2 nd raised part and a recessed part provided on a1 st surface side of the heat sink of embodiment 1 and an electronic component mounted on a circuit board in a perspective view from the 2 nd surface side of the heat sink. Fig. 23 is a cross-sectional view schematically showing a state in which an electrolytic capacitor is disposed in a recess in the ECU main body according to embodiment 1. As shown in fig. 21 to 23, the 1 st raised part 411 overlaps the 2 nd inner area 451B and a peripheral edge area close to the 2 nd inner area 451B in the 1 st inner area 451A when viewed from the Z-axis direction. Further, the electronic components 291 and 292 included in the 1 st power circuit 25A or the 2 nd power circuit 25B (see fig. 17A) overlap the 1 st bump 411 when viewed from the Z-axis direction.

The 2 nd raised parts 412A, 412B and the recessed parts 413A, 413B overlap the 1 st inner region 451A when viewed from the Z-axis direction. When viewed in the Z-axis direction, the electronic components 282A, 282B included in the control circuit 24 overlap the 2 nd bump portions 412A, 412B, respectively. Further, the electrolytic capacitors 253A, 253B disposed on the circuit board 20 overlap the recesses 413A, 413B, respectively, when viewed in the Z-axis direction.

As shown in fig. 23, a3 rd heat dissipating material 433 is provided on the bottom surface of the recess 413A. The 3 rd heat dissipating material 433 is, for example, TIM or heat dissipating grease similarly to the 1 st heat dissipating material 431 and the 2 nd heat dissipating material 432. Electrolytic capacitor 253A is housed in recess 413A. The top of the electrolytic capacitor 253A is in contact with the No. 3 heat sink material 433. The 3 rd heat dissipating member 433 is also provided on the bottom surface of the recess 413B, which is not shown. The electrolytic capacitor 253B is housed in the recess 413B, and the top of the electrolytic capacitor 253B is in contact with the 3 rd heat dissipating material 433. In the electrolytic capacitors 253A and 253B, the top portion refers to a portion on the side opposite to the side connected to the circuit board 20. The sides of the electrolytic capacitors 253A, 253B are close to the heat spreader 40, and the tops of the electrolytic capacitors 253A, 253B are in contact with the No. 3 heat dissipating material 433. This can improve the heat dissipation of the electrolytic capacitors 253A and 253B.

Fig. 24 is a perspective view showing a cross section of the electric drive device taken along line a 1-a 2 in fig. 8. Fig. 25 is a perspective view showing a configuration example of the 1 st coil wiring and the 2 nd coil wiring in embodiment 1. Fig. 26 is a sectional view of the electric drive device taken along line A3-a 4 in fig. 9. Fig. 27 is a sectional view of the electric drive device taken along line B1-B2 in fig. 9.

As shown in fig. 24 to 27, the electric drive device 1 includes 1 st coil wiring 321A, 322A, and 323A connected to the 1 st coil group Gr1 (see fig. 4), and 2 nd coil wiring 321B, 322B, and 323B connected to the 2 nd coil group Gr2 (see fig. 4). The 1 st coil wiring 321A, 322A, 323A and the 2 nd coil wiring 321B, 322B, 323B are copper wires or aluminum wires, respectively, and are so-called plate-shaped rectangular wires. The 1 st coil wires 321A, 322A, 323A and the 2 nd coil wires 321B, 322B, 323B have the 1 st portion WP1, the 2 nd portion WP2 connected to one end of the 1 st portion WP1, and the 3 rd portion WP3 connected to the other end of the 1 st portion WP1, respectively.

The 1 st portion WP1 protrudes outward of the cylindrical case 930 in a direction (for example, the Y direction) intersecting the axial direction Ax of the shaft 31. The 1 st portion WP1 protrudes outside the housing 930 when viewed in the axial direction (e.g., Z direction) of the shaft 31. Location 1 WP1 is parallel to the Y direction. The 2 nd portion WP2 protrudes from the 1 st portion WP1 toward the circuit board 20 outside the cylindrical case 930. The 2 nd portion WP2 is connected to the circuit board 20. Location 2 WP2 is parallel to the Z direction.

As shown in fig. 25, in the 1 st coil wiring 321A, 322A, 323A and the 2 nd coil wiring 321B, the 2 nd portions WP2 are arranged in a line in one direction (for example, the X direction) parallel to the X-Y plane. Thus, the 1 st power circuit 25A connected to the 1 st coil wiring 321A, 322A, 323A and the 2 nd power circuit 25B connected to the 2 nd coil wiring 321B, 322B, 323B can be arranged adjacent to each other.

In addition, in the 1 st coil wiring 321A, 322A, 323A and the 2 nd coil wiring 321B, 322B, 323B, the bent portion WP12 bent between the 1 st portion WP1 and the 2 nd portion WP2 is also arranged, for example, in the X axis direction.

The end of 2 nd portion WP2 on the side opposite to the side connected to 1 st portion WP1 is branched into two terminal pieces WP21 and WP 22. In each of the 1 st coil wires 321A, 322A, 323A, the terminal pieces WP21, WP22 are inserted into the 1 st through hole 21H6A provided in the circuit board 20. Thus, the 1 st coil wiring 321A, 322A, 323A is connected to the 1 st power circuit 25A, respectively. In the 2 nd coil wirings 321B, 322B, 323B, the terminal pieces WP21, WP22 are also inserted into the 2 nd through hole 21H6B provided in the circuit board 20, respectively. Thereby, the 2 nd coil wiring lines 321B, 322B, and 323B are connected to the 2 nd power circuit 25B, respectively.

For example, the 2 nd portion WP2 is connected to the circuit board 20 by press fitting. Press fit is a solderless electrical connection technique. Specifically, in the press-fitting, the terminal pieces WP21, WP22 are inserted into the 1 st through hole 21H6A and the 2 nd through hole 21H6B provided in the circuit board 20, and the outer peripheries of the terminal pieces WP21, WP22 are flexed so as to be elastically deformable. Thus, the 2 nd portion WP2 is connected to the conductor of the inner wall surface of the 1 st through hole 21H6A and the conductor of the inner wall surface of the 2 nd through hole 21H 6B. In embodiment 1, the connection of the 2 nd site WP2 to the circuit board 20 is not limited to the press bonding. Solder may also be used for connection of 2 nd site WP2 to circuit board 20.

The 3 rd position WP3 is connected to the 1 st group Gr1 or the 2 nd group Gr 2. The 3 rd portion WP3 is parallel to a direction (for example, the Z direction) intersecting the longitudinal direction of the 1 st portion WP 1. The longitudinal length L3 of the 3 rd portion WP3 is shorter than the longitudinal length L1 of the 1 st portion WP1 and shorter than the longitudinal length L2 of the 2 nd portion WP 2. The 3 rd position WP3 is arranged on the circumference of an imaginary circle centered on the shaft 31.

As shown in fig. 24 and 26, the electric drive device 1 includes the 1 st coupling member 67 for coupling the 1 st portions WP1 of the 1 st coil wires 321A, 322A, 323A and the 1 st portions WP1 of the 2 nd coil wires 321B, 322B, 323B to each other. The electric drive device 1 further includes a2 nd coupling member 68 that couples the 2 nd portions WP2 of the 1 st coil wires 321A, 322A, and 323A and the 2 nd portions WP2 of the 2 nd coil wires 321B, 322B, and 323B to each other. The 1 st coupling member 67 and the 2 nd coupling member 68 are each formed of an insulating resin. The 1 st coil wiring 321A, 322A, 323A and the 2 nd coil wiring 321B, 322B, 323B are adjacently disposed in the X direction in a state of being separated from each other by the 1 st coupling member 67 and the 2 nd coupling member 68.

As shown in fig. 27, the electric motor 30 includes, for example, 31 st terminal pieces 371, 372, 373 connected to the 1 st coil group Gr1 and 32 nd terminal pieces (not shown) connected to the 2 nd coil group Gr 2. When the heat sink 40 is attached to the electric motor 30 via the adapter 60, the 3 rd portions WP3 of the 1 st coil wires 321A, 322A, 323A are pressed against and brought into contact with the 1 st terminal pieces 371, 372, 373, respectively. In addition, the 3 rd portions WP3 of the 2 nd coil wirings 321B, 322B, 323B are also pressed against and brought into contact with the 2 nd terminal piece, not shown. Thus, the 1 st coil wiring 321A, 322A, 323A is connected to the 1 st coil group Gr1 via the 1 st terminal pieces 371, 372, 373, and the 2 nd coil wiring 321B, 322B, 323B is connected to the 2 nd coil group Gr2 via the 2 nd terminal piece. The 3 rd position WP3 and the 1 st terminal pieces 371, 372, 373 may be joined by resistance welding or laser welding, or the 3 rd position WP3 and the 2 nd terminal piece may be joined by resistance welding or laser welding.

As shown in fig. 27, the bent portions WP12 of the 1 st coil wires 321A, 322A, 323A are disposed inside the protruding portions 62 of the adapter 60. The 2 nd coil wiring 321B, 322B, and 323B also have bent portions WP12 (see fig. 25) disposed inside the protruding portions 62, which are not shown.

Fig. 28 is a perspective view showing an example of the quick attachment mechanism according to embodiment 1. As shown in fig. 28, the ECU10 includes a quick-attachment mechanism 55 for attaching the cover 50 to the radiator 40. The lid 50 has a top plate 51 and an outer peripheral portion 52 provided on the periphery of the top plate 51. The outer peripheral portion 52 stands from the top plate 51. For example, the lid 50 is made of metal or resin, and the top plate 51 and the outer peripheral portion 52 are integrally formed.

The quick attachment mechanism 55 includes, for example, an engaging portion 521 and an engaged portion 421 engageable with the engaging portion 521. The locking portion 521 is provided on the outer peripheral portion 52 of the cover 50. The locked portion 421 is provided on the outer peripheral portion 42 of the heat sink 40. For example, as shown in fig. 19, the locked portions 421 are provided on the outer peripheral portion 42LE and the outer peripheral portion 42RE adjacent to each other in the X direction (left-right direction). The locking portion 521 is provided at a position overlapping with the locked portion 421 in the Z direction when the cover 50 is attached to the heat sink 40.

In embodiment 1, in the step of attaching the cover 50 to the heat sink 40, first, the 2 nd adhesive 56 is disposed in the groove 422. Next, the outer peripheral portion 52 of the lid 50 is fitted into the groove portion 422. For example, an end 522 of the outer peripheral portion 52 on the side facing the heat sink 40 is fitted into the groove 422. Next, the locking portion 521 is locked to the locked portion 421 of the quick attachment mechanism 55. Thereby, the lid 50 is temporarily fixed to the heat sink 40. After the 2 nd adhesive 56 is cured, the cover 50 and the heat sink 40 are fixed together by both the quick-fit mechanism 55 and the 2 nd adhesive 56.

The heat sink 40 and the cover 50 constitute a housing for housing the circuit board 20. Since the 2 nd adhesive 56 is interposed between the outer peripheral portion 52 and the groove portion 422, the inside of the housing is highly airtight.

The lid 50 is provided with a valve 53. The valve 53 is opened and closed according to a pressure difference between the inside and the outside of the container. For example, when the above-described pressure difference becomes large due to a temperature change, the valve 53 is opened to reduce the pressure difference. When the pressure difference becomes small, the valve 53 closes to seal the inside of the container. In this way, the valve 53 can reduce the pressure variation inside the housing.

As described above, the electric drive device 1 according to embodiment 1 includes the electric motor 30 and the ECU10 provided on the opposite side of the shaft 31 from the load to drive and control the electric motor 30. The ECU10 includes: a magnet 32 located at an end of the shaft 31 on the opposite side to the load; and a circuit board 20 located on the opposite side of the shaft 31 from the load, and arranged on an extension of the shaft 31 in the axial direction (for example, the Z direction). The circuit board 20 includes a control circuit 24, a1 st power circuit 25A, a2 nd power circuit 25B, and a detection circuit 23 including a rotation angle sensor 23a that detects rotation of the magnet 32. The rotation angle sensor 23a is a magnetic sensor that detects rotation of the magnet 32. The 1 st power circuit 25A includes a plurality of electronic components 291 that supply current to the 1 st coil group Gr 1. The 2 nd power circuit 25B includes a plurality of electronic components 291 that supply current to the 2 nd coil group Gr 2. The control circuit 24 includes an electronic component 282A that controls the current supplied from the 1 st power circuit 25A, an electronic component 282B that controls the current supplied from the 2 nd power circuit 25B, and the like.

Further, the electric drive device 1 includes: 1 st coil wiring 321A, 322A, 323A connecting the 1 st coil group Gr1 and the circuit board 20; and 2 nd coil wirings 321B, 322B, 323B connecting the 2 nd coil group Gr2 and the circuit board 20. The 1 st coil wiring 321A, 322A, 323A and the 2 nd coil wiring 321B, 322B, 323B may be included in the ECU10 or the electric motor 30. The 1 st coil wiring 321A, 322A, 323A and the 2 nd coil wiring 321B, 322B, 323B each have: a1 st portion WP1 extending outward of the housing 930 in a direction (for example, the Y direction) intersecting the axial direction of the shaft 31; and a2 nd portion WP2 protruding from the 1 st portion WP1 toward the circuit board 20 outside the case 930.

With this configuration, the 1 st power circuit 25A and the 2 nd power circuit 25B can be disposed at positions close to the outer periphery of the circuit board 20, and the distance between the 1 st power circuit 25A and the 2 nd power circuit 25B and the rotation angle sensor 23a can be increased. This makes it difficult for heat generated in the 1 st power circuit 25A and the 2 nd power circuit 25B to be transmitted to the rotation angle sensor 23a, and therefore, a temperature increase in the rotation angle sensor 23a can be suppressed. Since the error in the detection value of the rotation angle sensor 23a due to temperature variation is reduced, the detection accuracy of the rotation angle can be improved.

Further, the distance between the rotation angle sensor 23A and the 1 st coil wiring 321A, 322A, 323A and the 2 nd coil wiring 321B, 322B, 323B can be increased. This can suppress the influence of the magnetic field generated by the current flowing through each of the 1 st coil wiring 321A, 322A, 323A and the 2 nd coil wiring 321B, 322B, 323B on the rotation angle sensor 23A. Since the error in the detection value of the rotation angle sensor 23a due to the magnetic field around the wiring is reduced, the detection accuracy of the rotation angle can be improved.

For example, when the torque sensor 94 detects a large steering torque, a large amount of currents I1U, I1V, and I1W (see fig. 16) flow from the 1 st power circuit 25A to the electric motor 30 via the 1 st coil wiring 321A, 322A, and 323A, and a large amount of currents I2U, I2V, and I2W (see fig. 16) flow from the 2 nd power circuit 25B to the electric motor 30 via the 2 nd coil wiring 321B, 322B, and 323B. As a result, strong magnetic fields may be generated around the 1 st coil wiring 321A, 322A, and 323A and around the 2 nd coil wiring 321B, 322B, and 323B in accordance with a large current. However, in the electric drive device 1 according to embodiment 1, the 1 st coil wiring 321A, 322A, 323A and the 2 nd coil wiring 321B, 322B, 323B are arranged so as to bypass the vicinity of the rotation angle sensor 23A. Thus, even if a strong magnetic field is generated around the 1 st coil wiring 321A, 322A, 323A and the 2 nd coil wiring 321B, 322B, 323B, the magnetic field can be made to have no influence on the detection accuracy of the rotation angle sensor 23A as much as possible.

As shown in fig. 24 to 26, the 1 st coil wiring 321A, 322A, 323A and the 2 nd coil wiring 321B, 322B, 323B are disposed adjacent to each other. For example, the 1 st coil wiring 321A, 322A, 323A and the 2 nd coil wiring 321B, 322B, 323B are arranged in a line in the X direction. Thus, the 1 st power circuit 25A connected to the 1 st coil wiring 321A, 322A, 323A and the 2 nd power circuit 25B connected to the 2 nd coil wiring 321B, 322B, 323B can be arranged adjacent to each other.

In addition, the 2 nd portion WP2 of the 1 st coil wiring 321A, 322A, 323A is connected to the 1 st power circuit 25A from a position closer to the outer periphery of the circuit board 20 than the electronic components 291, 292 included in the 1 st power circuit 25A. This can further suppress the influence of the magnetic field generated by the current flowing through the 1 st coil wiring 321A, 322A, 323A on the rotation angle sensor 23A.

As shown in fig. 18, the arrangement positions of the electronic components 291 and 292 included in the 1 st power circuit 25A are located between the arrangement position of the detection circuit 23 and the through hole 21H6A when viewed from the Z-axis direction. This makes it possible to separate the current path from the 1 st power circuit 25A to the electric motor 30 from the rotation angle sensor 23 a.

The 2 nd portion WP2 of the 2 nd coil wiring 321B, 322B, 323B is connected to the 2 nd power circuit 25B from a position closer to the outer periphery of the circuit board 20 than the electronic components 291, 292 included in the 2 nd power circuit 25B. This can further suppress the influence of the magnetic field generated around the 2 nd coil wiring 321B, 322B, 323B on the rotation angle sensor 23 a.

Further, when viewed from the Z-axis direction, the arrangement positions of the electronic components 291 and 292 included in the 2 nd power circuit 25B are located between the arrangement position of the detection circuit 23 and the 2 nd through hole 21H 6B. This makes it possible to separate the current path from the 2 nd power circuit 25B to the electric motor 30 from the rotation angle sensor 23 a.

Further, when viewed from the Z-axis direction, the arrangement position of the electronic component 282B included in the control circuit 24 is located on the opposite side of the 2 nd through hole 21H6B with the arrangement positions of the electronic components 291 and 292 included in the 2 nd power circuit 25B interposed therebetween. This makes it possible to separate the current path from the 2 nd power circuit 25B to the electric motor 30 from the control circuit 24.

Further, when viewed in the Z-axis direction, the arrangement position of the detection circuit 23 is located on the opposite side of the arrangement position of the electronic components 291 and 292 included in the 1 st power circuit 25A or the 2 nd power circuit 25B with the arrangement positions of the electrolytic capacitors 253A and 253B interposed therebetween. This can further increase the distance between the 1 st power circuit 25A and the rotation angle sensor 23a, or the distance between the 2 nd power circuit 25B and the rotation angle sensor 23 a.

As shown in fig. 18, the arrangement position of the detection circuit 23 is located on the opposite side of the arrangement position of the electronic components 291 and 292 included in the 1 st power circuit 25A or the 2 nd power circuit 25B with respect to a straight line 20CL passing through the center of the circuit board 20 when viewed in the Z-axis direction. Thus, the electronic components 291 and 292 included in the 1 st power circuit 25A or the 2 nd power circuit 25B are arranged in a single region of the circuit board 20 defined by the straight line 20 CL. The rotation angle sensor 23a is disposed in another region of the circuit board 20 defined by the straight line 20 CL. This can further increase the distance from the rotation angle sensor 23 a.

For example, the circuit board 20 is provided with a wiring (not shown) made of copper (Cu) or the like. A part of these wirings is connected to the electronic components 291 and 292 included in the 1 st power circuit 25A or the 2 nd power circuit 25B. Since a large current flows through the 1 st power circuit 25A and the 2 nd power circuit 25B as compared with the detection circuit 23 and the control circuit 24, a large current may flow through the wiring connected to the electronic components 291 and 292, and a strong magnetic field may be generated. However, in the electric drive device 1 according to embodiment 1, the distance between the 1 st power circuit 25A and the 2 nd power circuit 25B and the rotation angle sensor 23a is large. Therefore, even if a strong magnetic field is generated around the wiring connected to the electronic components 291 and 292, the magnetic field can be made to have no influence on the detection accuracy of the rotation angle sensor 23a as much as possible.

As shown in fig. 13, the connector CNT is connected to the circuit substrate 20 from the outside of the heat sink 40. As shown in fig. 9, the connector CNT is disposed outside the electric motor 30 when viewed from the Z-axis direction. This enables the connector CNT to be separated from the rotation angle sensor 23 a. For example, as shown in fig. 16, the connector CNT has power supply terminals Tdc, Tgnd. When torque sensor 94 detects a large steering torque, current PSC (see fig. 16) flows in a large amount from power supply terminal Tdc to power circuit 1a and power circuit 2B, and a strong magnetic field is generated around power supply terminals Tdc and Tgnd in some cases. However, in the electric drive device 1 according to embodiment 1, the power supply terminals Tdc and Tgnd are disposed outside the electric motor 30 when viewed from the Z-axis direction, and the distance between the power supply terminals Tdc and Tgnd and the rotation angle sensor 23a is large. Therefore, even if a strong magnetic field is generated around power supply terminals Tdc and Tgnd, the magnetic field can be made to have no influence on the detection accuracy of rotation angle sensor 23a as much as possible.

The electric drive device 1 further includes a heat sink 40 that supports the circuit board 20. This enables heat generated by the circuit board 20 to be efficiently dissipated.

The heat sink 40 has a1 st bump 411, and the 1 st bump 411 faces at least one of the 1 st power circuit 25A and the 2 nd power circuit 25B and bumps toward the circuit board 20. For example, the 1 st bump 411 is opposed to both the 1 st power circuit 25A and the 2 nd power circuit 25B. In ECU10, although the heat generation amounts of 1 st power circuit 25A and 2 nd power circuit 25B are relatively large, the heat dissipation efficiency of circuit board 20 is increased by opposing 1 st raised portion 411 to 1 st power circuit 25A and 2 nd power circuit 25B. This enables heat generated in the 1 st power circuit 25A and the 2 nd power circuit 25B to be efficiently dissipated.

The electric drive device 1 further includes a1 st heat sink 431 provided in the 1 st protrusion 411. This enables heat generated by the 1 st power circuit 25A and the 2 nd power circuit 25B to be dissipated more efficiently.

The heat sink 40 has 2 nd raised parts 412A and 412B, and the 2 nd raised parts 412A and 412B are raised toward the circuit board 20 side so as to face the control circuit 24. For example, the 2 nd bump 412A faces the electronic component 282A included in the control circuit 24, and the 2 nd bump 412B faces the electronic component 282B included in the control circuit 24. The electronic component 282A controls the current supplied by the 1 st power circuit 25A, and the electronic component 282B controls the current supplied by the 2 nd power circuit 25B. Therefore, although the heat generation amounts of the electronic components 282A and 282B are relatively large, the heat dissipation efficiency of the circuit board 20 is increased by opposing the 2 nd bump portion 412A to the electronic component 282A and opposing the 2 nd bump portion 412B to the electronic component 282B. This enables heat generated by the control circuit 24 to be efficiently dissipated.

The electric drive device 1 further includes a2 nd heat dissipating member 432 provided in the 2 nd raised parts 412A and 412B. This enables heat generated by the electronic components 282A and 282B to be dissipated more efficiently.

As shown in fig. 23, electrolytic capacitor 253A is housed in recess 413A of heat sink 40. Similarly, electrolytic capacitor 253B is housed in recess 413B of heat sink 40. This can reduce the thickness of the ECU main body 10 as compared with the case where the radiator 40 does not have a recess. Further, since the side surfaces of the electrolytic capacitors 253A and 253B can be brought close to the heat sink 40, the heat radiation performance of the electrolytic capacitors 253A and 253B can be improved.

As shown in fig. 25, the 1 st coil wire 321A, 322A, 323A and the 2 nd coil wire 321B, 322B, 323B have a bent portion WP12 bent between the 1 st portion WP1 and the 2 nd portion WP 2. As shown in fig. 27, the 1 st coil wiring 321A, 322A, 323A and the 2 nd coil wiring 321B, 322B, 323B have the bent portions WP12 disposed inside the adapter 60 (for example, inside the protruding portions 62). This allows the 1 st coil wiring 321A, 322A, 323A and the 2 nd coil wiring 321B, 322B, 323B to be further separated from the rotation angle sensor 23A.

As described above, in the electric drive device 1, the power supply terminal Tdc, the power supply terminal Tgnd, the 1 st power circuit 25A, the 2 nd power circuit 25B, the 1 st coil wire 321A, 322A, 323A, and the 2 nd coil wire 321B, 322B, 323B, to which a large current flows in accordance with the steering torque, are all separated from the rotation angle sensor 23A. Thus, even if a large current flows through each of the above-described portions and causes each portion to generate heat or a strong magnetic field is generated around each portion, the heat and the magnetic field do not affect the detection accuracy of the rotation angle sensor 23a as much as possible.

As shown in fig. 20, the heat sink 40 has a convex portion 40L provided on the bottom portion 45 of the 2 nd surface 40 b. As shown in fig. 11, the adapter 60 has a recess 60L provided on a surface facing the heat sink 40. The convex portion 40L can be fitted into the concave portion 60L. Thereby, the adapter 60 can be positioned with respect to the heat sink 40. In embodiment 1, the following configuration is also possible: the heat sink 40 is provided with a concave portion, the adapter 60 is provided with a convex portion, and the convex portion of the adapter 60 is fitted into the concave portion of the heat sink 40. In this mode, the adapter 60 can also be positioned with respect to the heat sink 40.

As shown in fig. 11, the 1 st adhesive 656 is disposed in the recess 60L of the adaptor 60. The 1 st adhesive 656 is disposed in the recess 60L. The heat sink 40 and the adaptor 60 are bonded with a1 st adhesive 656. This ensures that the adapter 60 does not detach from the heat sink 40.

The electric drive device 1 further includes a cover 50 covering the circuit board 20, and a quick-mounting mechanism 55 for fixing the cover 50 to the heat sink 40. One of the locking portion 521 and the locked portion 421 of the quick-attachment mechanism 55 is provided on the outer peripheral portion 52 of the lid 50. The other of the locking portion 521 and the locked portion 421 is provided on the outer peripheral portion 42 of the heat sink 40. This makes it possible to easily fix the cover 50 and the heat sink 40 together.

The electric drive device 1 further includes a valve 53 provided in the lid 50. The cover 50 and the heat sink 40 constitute a housing for housing the circuit board 20. The valve 53 is opened and closed according to a pressure difference between the inside and the outside of the container. This reduces the pressure change inside the container due to the temperature change in the valve 53.

Further, the heat sink 40 has a groove 422 provided in the outer peripheral portion 42. The outer peripheral portion 52 of the lid 50 can be fitted into the groove portion 422. This enables the cover 50 to be accurately positioned with respect to the heat sink 40.

Further, the electric drive device 1 includes the 2 nd adhesive 56 disposed in the groove portion 422. The lid 50 and the heat sink 40 are bonded together with the 2 nd adhesive 56. Thereby, the lid 50 and the heat sink 40 are fixed together by both the quick-fit mechanism 55 and the No. 2 adhesive 56.

The electric power steering apparatus 100 includes the electric drive apparatus 1, and the electric drive apparatus 1 can generate an assist steering torque.

(modification of embodiment 1)

In embodiment 1 described above, the 1 st coil wiring 321A, 322A, 323A and the 2 nd coil wiring 321B, 322B, 323B are arranged in a line in the X direction, but the arrangement of the 1 st coil wiring 321A, 322A, 323A and the 2 nd coil wiring 321B, 322B, 323B is not limited to this. For example, the 2 nd portions WP2 of the 1 st coil wiring 321A, 322A, 323A and the 2 nd coil wiring 321B, 322B, 323B may be arranged in a staggered pattern in the X direction (Japanese: a thousand bird foot pattern).

Fig. 29 is a schematic diagram showing a configuration of an electric drive device according to modification 1 of embodiment 1. As shown in fig. 29, in modification 1 of embodiment 1, 2 nd portions WP2 of 1 st coil wires 321A, 322A, 323A and 2 nd coil wires 321B, 322B, 323B are arranged in two rows in the X direction in a staggered manner. For example, the 2 nd portions WP2 of the 1 st coil wires 321A, 322A, 323A and the 2 nd coil wires 321B, 322B, 323B are located outside the case 930 of the motor 30 when viewed in plan from the axial direction Ax. These 2 nd portions WP2 are alternately arranged on one side and the other side with a straight line 320CL therebetween in the X direction. The straight line 320CL is an imaginary line parallel to the X direction and located outside the housing 930 of the motor 30.

In modification 1 shown in fig. 29, the 2 nd portion WP2 of the 1 st coil wire 321A, 322A, 323A and the 2 nd portion WP2 of the 2 nd coil wire 321B, 322B, 323B are also arranged in one direction (for example, the X direction) parallel to the X-Y plane. Therefore, the 1 st power circuit 25A connected to the 1 st coil wiring 321A, 322A, 323A and the 2 nd power circuit 25B connected to the 2 nd coil wiring 321B, 322B, 323B can be arranged adjacent to each other.

The 2 nd portions WP2 of the 1 st coil wire 321A, 322A, 323A and the 2 nd coil wire 321B, 322B, 323B may be arranged in a circumferential direction of a circle centered on the axial direction Ax.

Fig. 30 is a schematic diagram showing a configuration of an electric drive device according to modification 2 of embodiment 1. As shown in fig. 30, in modification 1 of embodiment 1, the 2 nd portions WP2 of the 1 st coil wire 321A, 322A, 323A and the 2 nd coil wire 321B, 322B, 323B are arranged to be aligned in the circumferential direction of a circle (imaginary circle) centered on the axial direction Ax. For example, the 2 nd portions WP2 of the 1 st coil wires 321A, 322A, 323A and the 2 nd coil wires 321B, 322B, 323B are located outside the case 930 of the motor 30 when viewed in plan from the axial direction Ax. These 2 nd portions WP2 are arranged parallel to the outer peripheral surface of the housing 930. The planar shape of the housing 930 is a perfect circle, and the center thereof overlaps with the axial direction Ax.

In modification 2 shown in fig. 30, the 1 st coil wiring 321A, 322A, 323A and the 2 nd coil wiring 321B, 322B, 323B are also arranged so as to be aligned in one direction parallel to the X-Y plane (for example, in the circumferential direction concentric with the housing of the electric motor 30). Therefore, the 1 st power circuit 25A connected to the 1 st coil wiring 321A, 322A, 323A and the 2 nd power circuit 25B connected to the 2 nd coil wiring 321B, 322B, 323B can be arranged adjacent to each other.

In embodiment 1, electrolytic capacitors 253A and 253B are respectively housed in recesses 413A and 413B of heat sink 40. At least a part of the inner circumferential surfaces of the recesses 413A and 413B may be shaped so as to conform or substantially conform to the outer circumferential surfaces of the electrolytic capacitors 253A and 253B.

Fig. 31 is a sectional view showing the structure of a recess in modification 3 of embodiment 1. As shown in fig. 31, an end face 253AA of the electrolytic capacitor 253A is along a bottom face 413AA of the recess 413. Preferably, the width C1 of the gap between the end face 253AA and the bottom face 413AA is constant. That is, it is preferable that the end surface 253AA is parallel to the bottom surface 413 AA.

As shown in fig. 31, the bottom 413AA of the recess 413A is substantially parallel to the end face 253 AA. An inner circumferential surface 413AB of the recess 413A is along an outer circumferential surface of the electrolytic capacitor 253A. An inner circumferential surface 413AB of the concave portion 413A is a cylindrical curved surface. In a cross section obtained by cutting the electrolytic capacitor 253A and the heat sink 40 with a plane parallel to the end face 253AA, the outer circumferential surface 253AB of the electrolytic capacitor 253A and the inner circumferential surface 413AB of the recess 413A draw circles, respectively. Preferably, the width C2 of the gap between the outer circumferential surface 253AB and the inner circumferential surface 413AB is constant.

The electrolytic capacitor 253A includes a convex curved surface 253AC connecting the end surface 253AA and the outer peripheral surface 253 AB. The concave portion 413A includes a concave curved surface 413AC connecting the bottom surface 413AA and the inner circumferential surface 413 AB. The curved face 413AC is a curved face recessed with respect to the electrolytic capacitor 253A. In the cross section shown in fig. 31, the curved surface 413AC describes an arc. The radius of curvature of the arc described by the curved surface 413AC is larger than the radius of curvature of the arc described by the curved surface 253AC of the electrolytic capacitor 253A. Preferably, in the cross section shown in fig. 31, the center of the arc described by the curved surface 413AC of the concave portion 413A is the same as the center of the arc described by the curved surface 253AC of the electrolytic capacitor 253A. It is preferable that the width C3 of the gap between the curved surface 253AC and the curved surface 413AC shown in fig. 31 is constant.

The 3 rd heat sink material 433 is a material for promoting conduction of heat generated by the circuit board 20 (see fig. 16) to the heat sink 40. The 3 rd heat dissipation material 433 is, for example, a material obtained by mixing a thermally conductive filler with a silicon polymer. The 3 rd heat dissipating material 433 is, for example, paste. For example, the viscosity of the 3 rd heat dissipating material 433 is about 45Pa · s. The 3 rd heat dissipating material 433 is in contact with the electrolytic capacitor 253A and the inner wall of the recess 413A. More specifically, the 3 rd heat dissipating material 433 is in contact with the end face 253AA, the curved face 253AC, and the outer circumferential face 253AB of the electrolytic capacitor 253A, and the bottom face 413AA, the curved face 413AC, and the inner circumferential face 413AB of the concave portion 413A, respectively.

Since the 3 rd heat dissipation material 433 having a higher thermal conductivity than that of air is in contact with the electrolytic capacitor 253A and the heat sink 40, the heat dissipation efficiency is improved as compared with the case without the 3 rd heat dissipation material 433. Manufacturing errors may occur with respect to the axial length and outer diameter of the electrolytic capacitor 253A. For example, in the electrolytic capacitor 253A, the error in the axial length is about ± 0.3mm or ± 0.5mm, depending on the outer diameter. The error of the outer diameter is about +/-0.5 mm. Further, there is a possibility that the position of the electrolytic capacitor 253A may be shifted from the designed position due to a manufacturing error (flexure) of the substrate main body 21 and an assembly error when the circuit board 20 is mounted on the heat sink 40.

With respect to the width C1 shown in fig. 31, even when a manufacturing error of the axial length of the electrolytic capacitor 253A, a manufacturing error of the substrate main body 21, and an assembly error occur, the width C1 is preferably equal to or more than a predetermined lower limit value (for example, 0.5mm) and equal to or less than a predetermined upper limit value (for example, 1.5 mm). By making the width C1 equal to or greater than the lower limit, a predetermined amount of the 3 rd heat dissipation material 433 is likely to be interposed between the end surface 253AA and the bottom surface 413AA, thereby improving heat dissipation efficiency. By setting the width C1 to be equal to or less than the upper limit value, the amount of the 3 rd heat radiating member 433 used for obtaining a predetermined heat radiation efficiency of the electrolytic capacitor 253A is reduced.

With respect to the width C2 shown in fig. 31, even when a manufacturing error or an assembly error of the outer diameter of the electrolytic capacitor 253A occurs, the width C2 is preferably equal to or more than a predetermined lower limit value (for example, 0.5mm) and equal to or less than a predetermined upper limit value (for example, 1.5 mm). By setting the width C2 to be equal to or greater than the lower limit value, a predetermined amount of the 3 rd heat dissipation material 433 is easily interposed between the outer circumferential surface 253AB and the inner circumferential surface 413AB, and thus the heat dissipation efficiency is improved. By setting the width C2 to be equal to or less than the upper limit value, the amount of the 3 rd heat radiating member 433 used for obtaining a predetermined heat radiation efficiency of the electrolytic capacitor 253A is reduced.

With respect to the width C3 shown in fig. 31, even when manufacturing errors of the axial length and the outer diameter of the electrolytic capacitor 253A, manufacturing errors of the substrate main body 21, and assembly errors occur, the width C3 is preferably equal to or more than a predetermined lower limit value (e.g., 0.5mm) and equal to or less than a predetermined upper limit value (e.g., 1.5 mm). By making the width C3 equal to or greater than the lower limit value, a predetermined amount of the 3 rd heat dissipation material 433 is likely to be interposed between the curved surface 253AC and the curved surface 413AC, and thus the heat dissipation efficiency is improved. By setting the width C3 to be equal to or less than the upper limit value, the amount of the 3 rd heat radiating member 433 used for obtaining a predetermined heat radiation efficiency of the electrolytic capacitor 253A is reduced.

In modification 3, the description has been given of the recess 413A and the electrolytic capacitor 253A housed in the recess 413A, but the description is also applicable to the recess 413B and the electrolytic capacitor 253B housed in the recess 413B. For example, in fig. 31, concave portion 413A may be replaced with concave portion 413B, and electrolytic capacitor 253A may be replaced with electrolytic capacitor 253B.

Embodiment 1 has been described above, but the present invention is not limited to the above description. For example, the 1 st raised part 411 and the 2 nd raised parts 412A and 412B are separated, but the 1 st raised part 411 and the 2 nd raised parts 412A and 412B may be connected and integrated.

(embodiment mode 2)

In the embodiment of the present invention, the heat sink may be provided with an annular wall portion. Further, a through hole through which the shaft passes may be provided inside the ring of the wall portion. Thus, the magnet provided at the end of the shaft on the opposite side to the load is surrounded by the wall.

Fig. 32 is an exploded perspective view showing a configuration example of an ECU main body according to embodiment 2. The broken line in fig. 32 shows a current path from the power supply terminals Tdc, Tgnd to the electric motor 30 (see fig. 10) via the ECU body 10A. In embodiment 2, the ECU10 (see fig. 10) also includes the ECU main body 10A and the lid 50 (see fig. 7). The ECU main body 10A includes a circuit board 20, a heat sink 40 that supports the circuit board 20, and a connector CNT. The circuit substrate 20 and the connector CNT are mounted to the heat sink 40. The connector CNT is connected to the circuit substrate 20 from the outside of the heat sink 40. The connector CNT is disposed outside the electric motor 30 when viewed from the Z-axis direction.

Fig. 33 is a front view showing a configuration example of a heat sink according to embodiment 2. Fig. 34 is a rear view showing a configuration example of a heat sink according to embodiment 2. Fig. 35 is a view showing a1 st raised part, a2 nd raised part and a recessed part provided on a1 st surface side in a perspective view from the 2 nd surface side in the heat sink of embodiment 2. Fig. 36 is a view showing a1 st raised part, a2 nd raised part and a recessed part provided on a1 st surface side of the heat sink of embodiment 2, and an electronic component mounted on a circuit board, as seen in perspective from the 2 nd surface side of the heat sink.

As shown in fig. 32 to 36, the heat sink 40 includes an annular wall 44 provided on the bottom portion 41 of the 1 st surface 40a and a plurality of ribs 442. The wall 44 surrounds the through hole 46 when viewed in plan from the axial direction Ax (Z-axis direction) of the shaft 31, and the inner side of the ring of the wall 44 overlaps the through hole 46. The wall 44 is provided along the outer periphery of the through hole 46, and rises upward (toward the circuit board 20) from the bottom 41 of the first surface 40 a. The ring of the wall portion 44 is a perfect circle when viewed from the Z-axis direction. The center of the ring of the wall portion 44 coincides or substantially coincides with the center of the through hole 46 when viewed from the Z-axis direction. A groove tr for fixing a cap 57 (see fig. 38) described later is provided on the outer peripheral surface 44b of the wall 44.

The rib 442 connects the outer peripheral surface 44b of the wall 44 and the bottom portion 41 of the 1 st surface 40 a. The plurality of ribs 442 are arranged at equal intervals around the wall portion 44 when viewed from the Z-axis direction.

The wall 44 and the plurality of ribs 442 are formed integrally with the heat sink 40. Like the heat sink 40, the wall 44 and the plurality of ribs 442 are made of metal such as aluminum or copper. This allows the wall 44 to shield the magnetic field between the inside and the outside of the ring of the wall 44.

Fig. 37 is a sectional view showing a configuration example of an electric drive device according to embodiment 2. Fig. 38 is an enlarged cross-sectional view of the wall portion and the periphery thereof in fig. 37. Fig. 38 shows a state in which the cap is attached to the wall portion. Fig. 39 is a plan view showing a structural example of a wall portion and a plurality of ribs in embodiment 2. In fig. 39, the magnet 32 and the rotation angle sensor 23a are indicated by broken lines in order to show the positional relationship between the wall 44 and the magnet 32 and the positional relationship between the wall 44 and the rotation angle sensor 23a when viewed from the Z-axis direction in plan view.

As shown in fig. 37 and 38, a groove tr is provided in the outer peripheral surface 44b of the wall 44. The wall portion 44 laterally surrounds the magnet 32. The upper surface 44a of the wall portion 44 is located closer to the circuit substrate 20 than the magnet 32. The cap 57 is attached to an end (hereinafter, referred to as an upper end) 441 of the wall 44 on the circuit board 20 side.

As shown in fig. 39, in embodiment 2, for example, 3 ribs 442A, 442B, 442C are arranged as the plurality of ribs 442. The 3 ribs 442A, 442B, 442C are disposed at equal intervals around the wall portion 44. For example, the center of the ring of the wall portion 44 overlaps the axial direction Ax of the shaft 31 when viewed from the Z-axis direction. The 3 ribs 442A, 442B, 442C are arranged at equal intervals along the circumference of a perfect circle centered on the axial direction Ax. The rib 442B is disposed at a position separated from the rib 442A by an angle θ 1 in the circumferential direction. The rib 442C is disposed at a position separated from the rib 442B by an angle θ 2 in the circumferential direction. The rib 442A is disposed at a position separated from the rib 442C by an angle θ 3 in the circumferential direction. In the example shown in fig. 39, θ 1 — θ 2 — θ 3 is 120 °.

Fig. 40A is a plan view showing a structural example of the cap according to embodiment 2. Fig. 40B is a sectional view showing a structural example of the cap according to embodiment 2. FIG. 40B shows a cross-section taken along line A5-A6 from the top view shown in FIG. 40A. Fig. 40C is a bottom view showing a structural example of the cap according to embodiment 2. As shown in fig. 40A to 40C, the cap 57 includes a top plate 571 and an edge 572 that supports the outer periphery of the top plate 571. As shown in fig. 38 (or fig. 40A to 40C), the rim 572 includes a protrusion 572C (or a protrusion 572d) protruding inward of the cap 57. The top plate 571, the rim 572, and the protrusion 572c (or the protrusion 572d) are integrally formed.

Further, the protrusion 572c and the protrusion 572d differ only in shape. The lower surface of the protrusion 572d (the surface facing the 1 st surface 40a (see fig. 37) of the heat sink 40) is inclined with respect to the protrusion 572c, and is shaped to be easily fitted into the groove tre. The protrusion included in the rim 572 may be either one of the protrusion 572c and the protrusion 572 d.

The material of the cap 57 is resin. For example, the material of the cap 57 is resin having elasticity. As the resin having elasticity, an elastomer resin having rubber elasticity can be exemplified. This allows the edge 572 and the projections 572c and 572d to be elastically deformed, and thus the cap 57 can be easily attached to the wall 44 in a detachable manner. The material of the cap 57 may be vinyl resin or polyester resin.

The material of the top plate 571 may be different from the material of the rim 572 and the protruding portions 572c and 572 d. For example, the top plate 571 may be a film made of a vinyl resin or a polyester resin, and the edge 572 and the projections 572c and 572d may be made of an elastomer resin.

In addition, the material of the cap 57 may be colorless transparent or colored transparent. Particularly, the top plate 571 is preferably transparent. Transparent means having light transmittance (a property of transmitting visible light). If the top plate 571 is transparent, the worker (or the manufacturing apparatus) can observe the inside of the ring of the wall portion 44 through the cap 57.

As shown in fig. 38, when the cap 57 is covered on the upper end 441 of the wall 44 and the top plate 571 is in contact with the upper surface 44a of the wall 44, the protrusion 572c is engaged with the groove tre. Thus, the cap 57 is detachably attached to the wall portion 44. When the cap 57 is attached to the wall portion 44 and the circuit board 20 is attached to the 1 st surface 40a side of the heat sink 40, the top plate portion 571 is in a state of being interposed between the magnet 32 and the rotation angle sensor 23 a. In this state, the top plate portion 571 is separated from both the rotation angle sensor 23a and the magnet 32. D represents the distance between the rotation angle sensor 23a and the magnet 32₁₁D represents the thickness of the top plate 571₁₂At a distance d₁₁Greater than the thickness d₁₂(d₁₁＞d₁₂). Thickness d of the top plate 571₁₂For example, several tens of μm or several hundreds of μm.

As described above, the electric drive device 1 according to embodiment 2 includes the heat sink 40 and the annular wall portion 44. The heat sink 40 has a1 st surface 40a and a2 nd surface 40b located on the opposite side of the 1 st surface 40a, and supports the circuit board 20 on the 1 st surface 40a side. The heat sink 40 has a through hole 46 provided between the 1 st surface 40a and the 2 nd surface 40b and through which the shaft 31 passes. The wall portion 44 is disposed between the 1 st surface 40a and the circuit board 20. The through hole 46 is located inside the ring of the wall portion 44 when viewed from the axial direction Ax (Z-axis direction) of the shaft 31 in plan view. Thus, the wall portion 44 has an end portion on the circuit board 20 side, and the cap 57 can be detachably attached to the end portion. This prevents foreign matter from entering the inside of the ring of the wall 44 from the 1 st surface 40a side of the heat sink 40. Since the magnet 32 is positioned inside the ring of the wall portion 44, it is possible to suppress foreign matter from adhering to the magnet 32.

For example, a case is assumed where the electric motor 30 is manufactured in a clean room. In this case, the electric motor 30 is manufactured in the clean room, the manufactured electric motor 30 is attached to the radiator 40, and the cap 57 is attached to the wall portion 44. Thus, even when the electric motor 30 is carried out to the outside of the clean room, the inside of the ring of the wall portion 44 can be maintained as the environment of the clean room. By attaching the cap 57 to the wall portion 44, the process can be transferred to the assembly process of the ECU10 while the inside of the ring of the wall portion 44 is maintained in a clean state (a state with less contamination). In the assembly step of the ECU10, the ECU main body 10A is assembled, the lid 50 is attached to the ECU main body 10A, and the like.

In the step of assembling the ECU10, the worker (or the manufacturing apparatus) may or may not remove the cap 57. Since the cap 57 is detachably attached to the wall portion 44, it is possible to perform any of an operation of detaching the cap 57 from the wall portion 44 and an operation of retaining the cap 57 on the wall portion 44.

In addition, the cap 57 is transparent. Thereby, the worker (or the manufacturing apparatus) can observe the inside of the ring of the wall portion 44 through the cap 57. The inside of the ring of the wall portion 44 is maintained in a clean state by the cap 57, and in this state, the worker (or the manufacturing apparatus) can observe the inside of the ring of the wall portion 44 or perform an appearance inspection of the magnet 32 positioned inside the ring.

Further, based on the result of the above-described appearance inspection or the like, the worker (or the manufacturing apparatus) may temporarily remove the cap 57 from the wall portion 44, perform a finishing process or the like, and then attach the cap 57 to the wall portion 44. Since the cap 57 is detachable from the wall portion 44, such a process can be performed.

The electric drive device 1 further includes a plurality of ribs 442 that connect the outer peripheral surface 44b of the wall portion 44 and the 1 st surface 40 a. This can improve the coupling strength between the wall 44 and the heat sink 40.

The plurality of ribs 442 are arranged at equal intervals along the periphery of the wall portion 44. This ensures that the coupling strength between the wall 44 and the heat sink 40 does not vary around the wall 44.

The electric drive device 1 further includes a cap 57. The cap 57 is attached to an end of the wall portion 44 on the circuit board 20 side. The cap 57 has a top plate 571 that faces the magnet 32, and an edge 572 that supports the outer periphery of the top plate 571. The material of the top plate portion 571 is resin. Thereby, the magnetic flux emitted from the magnet 32 can pass through the top plate 571 of the cap 57, and the rotation angle sensor 23a can detect the magnetic flux. It is not necessary to remove the cap 57 from the end of the wall portion 44 in order to allow the magnetic flux to pass therethrough. Therefore, in the assembly process of the electric drive device 1, the process of removing the cap 57 is not required, and an increase in the number of processes can be suppressed. Further, even after the circuit board 20 is mounted on the heat sink 40 and the electric drive device 1 is completed, the cap 57 can be maintained in the state of being mounted on the wall portion 44. This can continuously suppress the adhesion of foreign matter to the magnet 32.

The wall 44 has a groove tre provided on the outer peripheral surface 44 b. The rim 572 of the cap 57 has a protrusion 572c provided at a position overlapping the groove tre. The protrusion 572c can engage with the groove tre. This enables the cap 57 to be fixed to the wall portion 44.

Further, the wall portion 44 and the plurality of ribs 442 are formed integrally with the heat sink 40. Like the heat sink 40, the wall 44 and the plurality of ribs 442 are made of metal such as aluminum or copper. Accordingly, there is no boundary of engagement between the wall 44 and the radiator 40, between the plurality of ribs 442 and the radiator 40, and between the wall 44 and the plurality of ribs 442, and therefore the coupling strength between the wall 44 and the radiator 40 can be improved. The wall 44 is made of the same material as the heat sink 40, and is made of, for example, metal. If the material of the wall portion 44 is metal, the magnetic field is shielded between the inside and the outside of the ring of the wall portion 44. This prevents the magnetic field generated by the current flowing through each of the 1 st coil wiring 321A, 322A, 323A and the 2 nd coil wiring 321B, 322B, 323B from affecting the inside of the ring of the wall 44. Since the error in the detection value of the rotation angle sensor 23a due to the magnetic field around the wiring is further reduced, the detection accuracy of the rotation angle can be further improved.

(modification of embodiment 2)

Fig. 41 is a sectional view showing the structure of a cap according to modification 1 of embodiment 2. As shown in fig. 41, the cap 57A of modification 1 includes a top plate 571 and an edge 572 that supports the outer periphery of the top plate 571. The rim 572 includes a protrusion 572c protruding inward of the cap 57.

In modification 1, when the cap 57 is attached to the wall portion 44 and the circuit board 20 is attached to the 1 st surface 40a side of the heat sink 40, the upper surface 572a of the edge portion 572 is in contact with the circuit board 20. For example, when the circuit board 20 is fixed to the heat sink 40 by inserting screws into the through holes 21H1 (see fig. 32) of the circuit board 20, the circuit board 20 presses the upper surface 572a of the edge portion 572, and the circuit board 20 and the upper surface 572a are brought into close contact with each other. Thus, the circuit board 20 is supported by both the heat sink 40 and the cap 57, and therefore vibration of the circuit board 20 with respect to the heat sink 40 can be suppressed.

The rotation angle sensor 23a is mounted on the circuit board 20, and vibration of the rotation angle sensor 23a can be suppressed by suppressing vibration of the circuit board 20. This enables the distance d between the magnet 32 and the rotation angle sensor 23a to be set₁₁(refer to fig. 38) is kept constant. Thus, the rotation angle sensor 23a can accurately detect the rotation angle of the magnet. The material of the rim 572 may be resin. The resin rim 572 can absorb the vibration of the circuit board 20, and can improve the vibration-proof effect of the circuit board 20.

Fig. 42 is a sectional view showing the structure of a cap according to modification 2 of embodiment 2. As shown in fig. 42, the cap 57B of modification 2 includes a top plate 571, an edge 572 that supports the outer periphery of the top plate 571, and an elastic ring 575 that is supported by the upper surface 572a (see fig. 43A to 43C) of the edge 572B. The material of the elastic ring 575 is, for example, an insulating resin. The rim 572 includes a protrusion 572c protruding inward of the cap 57B. In modification 2, when the cap 57B is attached to the wall portion 44 and the circuit board 20 is attached to the 1 st surface 40a side of the heat sink 40, the circuit board 20 presses the elastic ring 575 to the 1 st surface 40a side of the heat sink 40. Thereby, the elastic ring 575 is respectively brought into close contact with the circuit board 20 and the edge portion 572. The elastic ring 575 is, for example, an O-ring seal.

Fig. 43A is a plan view showing the structure of a cap according to modification 2 of embodiment 2. Fig. 43B is a sectional view showing the structure of a cap according to modification 2 of embodiment 2. FIG. 43B shows a cross-section taken along line A7-A8 from the top view shown in FIG. 43A. Fig. 43C is a bottom view showing the structure of a cap according to modification 2 of embodiment 2. Fig. 43A shows a state in which an elastic ring 575 is fitted into the groove portion 574 of the cap 57B in modification 2. As shown in fig. 43A to 43C, a groove 574 is provided in an upper surface 572a of the rim 572 of the cap 57B. The groove 574 has a ring shape when viewed from the Z-axis direction. An elastic ring 575 is fitted in the ring-shaped groove 574.

In modification 2, when the circuit board 20 is mounted on the 1 st surface 40a side of the heat sink 40, the elastic ring 575 is in contact with the circuit board 20. For example, when the circuit board 20 is fixed to the heat sink 40 by inserting screws into the through holes 21H1 (see fig. 32) of the circuit board 20, the circuit board 20 presses the elastic ring 575, and the circuit board 20 and the elastic ring 575 are brought into close contact with each other. Thus, the circuit board 20 is supported by both the heat sink 40 and the cap 57, and therefore, vibration of the circuit board 20 with respect to the heat sink 40 can be suppressed. Further, the elastic ring 575 can absorb vibration of the circuit board 20, and can improve the vibration-proof effect of the circuit board 20.

Fig. 44A is a cross-sectional view showing a wall portion and its periphery in modification 3 of embodiment 2. Fig. 44B is a cross-sectional view showing a state in which a cap is attached to a wall portion of modification 3 of embodiment 2. In embodiment 2, the heat sink and the wall portion may be formed relatively independently. For example, as shown in fig. 44A, in modification 3, a recess 40c is provided in a bottom portion 41 of the 1 st surface 40a of the heat sink 40. The bottom of wall portion 44A of modification 3 is fitted into recess 40 c. Thereby, wall 44A is fixed to radiator 40. Even with such a configuration, as shown in fig. 44B, the cap 57 can be attached to the wall portion 44A. The cap 57 can prevent foreign matter from entering the inside of the ring of the wall portion 44 from the 1 st surface 40a side of the heat sink 40. This can suppress the adhesion of foreign matter to the magnet 32.

In modification 3, since the heat sink 40 and the wall portion 44A can be manufactured separately, the heat sink 40 can be formed into a simpler shape. This facilitates the manufacture of the heat sink 40 using, for example, a mold.

The material of the wall portion 44A may be a metal such as aluminum or copper, or may be a resin such as engineering plastic. If the material of the wall portion 44A is resin, the wall portion 44A can be formed by injection molding, and therefore, the wall portion 44A can be easily manufactured.

As shown in fig. 44A and 44B, a magnetic shield layer 447 may be attached to or applied to the inner peripheral surface 44c of the wall portion 44A. Thereby, even in the case where the wall portion 44A is made of resin, the magnetic field can be shielded between the inside and the outside of the wall portion 44A.

Fig. 45 is a cross-sectional view showing a wall portion and its periphery in modification 4 of embodiment 2. The material of the wall portion 44B of modification 4 is resin. The resin wall 44B is formed integrally with the resin cap 57A. Even with such a configuration, the cap 57A can prevent foreign matter from entering the inside of the ring of the wall portion 44 from the 1 st surface 40a side of the heat sink 40. This can suppress the adhesion of foreign matter to the magnet 32. In addition, since the step of attaching the cap 57A to the wall portion 44B is not required in the step of assembling the electric drive device 1, an increase in the number of steps can be suppressed.

Embodiment 2 has been described above, but the present invention is not limited to the above description. For example, the ring of wall portions 44, 44A is not limited to a perfect circle. The ring of the wall portions 44, 44A may be an ellipse, or a polygon of a triangle or a quadrangle or more.

(embodiment mode 3)

In the embodiment of the present invention, the cap may not be provided on the annular wall portion. The annular wall portion may be in direct contact with the circuit board, or an elastic body may be disposed between the annular wall portion and the circuit board. The elastic body may be in contact with the annular wall portion and the circuit board.

Fig. 46 is an exploded perspective view showing a configuration example of an ECU main body according to embodiment 3. Fig. 47 is a sectional view showing a configuration example of an electric drive device according to embodiment 3. Fig. 48 is an enlarged cross-sectional view of the wall portion and the periphery thereof in fig. 47. Fig. 48 shows a state where the elastic ring 445 is attached to the wall portion. Fig. 49 is a plan view showing a structural example of the wall portion and the plurality of ribs in embodiment 3. Fig. 49 shows a state where the elastic ring 445 is fitted into the groove 446 provided on the upper surface 44a of the wall portion 44. In fig. 49, the magnet 32 and the rotation angle sensor 23a are indicated by broken lines in order to show the positional relationship between the elastic ring 445, the magnet 32, and the rotation angle sensor 23a when viewed from the Z-axis direction.

As shown in fig. 46 to 49, in embodiment 3, the annular wall portion 44 is not provided with the groove portion tr (see fig. 32) for fixing the cap. In embodiment 3, a groove 446 into which the elastic ring 445 is fitted is provided on the upper surface of the wall portion 44.

As shown in fig. 47 to 49, wall 44 laterally surrounds magnet 32. The upper surface 44a of the wall portion 44 is located closer to the circuit substrate 20 than the magnet 32. Further, an elastic ring 445 is disposed on the upper surface 44a of the wall portion 44. For example, an annular groove 446 is provided on the upper surface 44a of the wall 44. The groove 446 has the same shape as the wall 44 when viewed from above in the Z-axis direction, and is, for example, a perfect circle. As shown in fig. 49, an elastic ring 445 is embedded in the upper surface of the wall portion 44.

The material of the elastic ring 445 is, for example, an insulating resin. When the circuit board 20 is mounted on the 1 st surface 40a side of the heat sink 40, the circuit board 20 presses the elastic ring 445 toward the 1 st surface 40a side of the heat sink 40. Thereby, the elastic ring 445 is respectively brought into close contact with the circuit board 20 and the wall portion 44. The elastic ring 445 is, for example, an O-ring seal.

As described above, the electric drive device 1 according to embodiment 3 includes the heat sink 40, the annular wall portion 44, and the elastic ring 445 (elastic body) disposed between the wall portion 44 and the circuit board 20. The heat sink 40 has a1 st surface 40a and a2 nd surface 40b located on the opposite side of the 1 st surface 40a, and supports the circuit board 20 on the 1 st surface 40a side. The heat sink 40 has a through hole 46 provided between the 1 st surface 40a and the 2 nd surface 40b and through which the shaft 31 passes. The wall portion 44 is disposed between the 1 st surface 40a and the circuit board 20. The through hole 46 is located inside the ring of the wall portion 44 when viewed in plan from the axial direction Ax (Z-axis direction) of the shaft 31.

Thus, by bringing the elastic ring 445 into close contact with the wall portion 44 and the circuit board 20, the vibration of the circuit board 20 can be suppressed, and the vibration of the rotation angle sensor 23a with respect to the magnet 32 can be suppressed. Thereby, the spacing distance between the rotation angle sensor 23a and the magnet 32 can be further kept constant. This allows the rotation angle sensor 23a to accurately detect the rotation angle of the magnet 32.

When the circuit board 20 vibrates, a load acts on a joint portion where the circuit board 20 is joined to various components (the rotation angle sensor 23A, the electronic components 281, 282A, 282B, the smoothing capacitors 253A, 253B, and the like). In embodiment 3, since the vibration of the circuit board 20 can be suppressed, the load acting on the joint portion can be reduced.

Further, the through hole 26 is located inside the elastic ring 445 when viewed in plan from the axial direction Ax (Z-axis direction) of the shaft 31. Thus, when the elastic ring 445 is brought into close contact with the wall portion 44 and the circuit board 20, respectively, the ring of the wall portion 44 is closed by the circuit board 20. This prevents foreign matter from entering the inside of the ring of the wall 44 from the 1 st surface 40a side of the heat sink 40. Since the magnet 32 is positioned inside the ring of the wall portion 44, it is possible to suppress foreign matter from adhering to the magnet 32 (contamination is generated).

The wall portion 44 has a groove 446 provided on the upper surface 44a (the surface facing the circuit board 20). The elastic ring 445 can be fitted into the groove portion 446. This facilitates the arrangement of the elastic ring 445 on the upper surface 44a of the wall portion 44. The elastic ring 445 can be prevented from being displaced with respect to the wall portion 44.

The elastic ring 445 is insulating. This allows the elastic ring 445 to insulate the circuit board 20 from the wall portion 44. For example, even in the case where the wall portion 44 is made of metal, the elastic ring 445 can prevent current from flowing between the wall portion 44 and the circuit substrate 20.

(modification of embodiment 3)

Fig. 50 is a cross-sectional view showing a wall portion and its periphery in a modification of embodiment 3. In embodiment 3, the heat sink and the wall portion may be formed relatively independently. For example, as shown in fig. 50, in the modification, a recess 40c is provided in a bottom portion 41 of the 1 st surface 40a of the heat sink 40. The bottom of the wall portion 44A of the modification is fitted into the recess 40 c. Thereby, wall 44A is fixed to radiator 40. Even with such a configuration, elastic ring 445 (see fig. 48) can be fitted into groove 446 of wall 44A. By bringing the elastic ring 445 into close contact with the wall portion 44A and the circuit board 20, respectively, vibration of the circuit board 20 can be suppressed, and vibration of the rotation angle sensor 23a with respect to the magnet 32 can be suppressed. Thereby, the spacing distance between the rotation angle sensor 23a and the magnet 32 can be further kept constant. The rotation angle sensor 23a can accurately detect the rotation angle of the magnet 32.

In the modification, the heat sink 40 and the wall portion 44A can be manufactured separately, and therefore the heat sink 40 can be formed into a simpler shape. This facilitates the manufacture of the heat sink 40 using, for example, a mold.

In embodiment 3, the material of the wall portion 44A may be a metal such as aluminum or copper, or may be a resin such as engineering plastic. If the material of the wall portion 44A is resin, the wall portion 44A can be formed by injection molding, and therefore, the wall portion 44A can be easily manufactured.

As shown in fig. 50, a magnetic shield layer 447 may be attached to or applied to the inner peripheral surface 44c of the wall portion 44A. Thereby, even in the case where the wall portion 44A is made of resin, the magnetic field can be shielded between the inside and the outside of the wall portion 44A.

Although embodiment 3 has been described above, in embodiment 3, the ring of wall portions 44 and 44A is not limited to a perfect circle. The ring of the wall portions 44, 44A may be an ellipse, or a polygon of a triangle or a quadrangle or more.

(embodiment mode 4)

In embodiments 1 to 3, the connector is attached to the heat sink. However, in the embodiment of the present invention, the mounting position of the connector is not limited to the heat sink. The connector may be provided on the cover body instead of the heat sink.

Fig. 51 is a perspective view showing a configuration example of an electric drive device according to embodiment 4. Fig. 52 is a plan view showing a configuration example of the electric drive device according to embodiment 4. Fig. 53 is a bottom view showing a configuration example of an electric drive device according to embodiment 4. Fig. 54 to 56 are exploded perspective views showing a configuration example of an electric drive device according to embodiment 4. Fig. 57 is a perspective view showing a configuration example of an ECU main body according to embodiment 4. Fig. 58 is a bottom view showing a structural example of an ECU main body according to embodiment 4. Fig. 59 is an exploded perspective view showing a configuration example of an ECU main body according to embodiment 4. The broken line in fig. 59 shows a current path from the power supply terminals Tdc and Tgnd to the electric motor 30 (see fig. 54) via the ECU body 10A.

As shown in fig. 51 to 59, the ECU10 of embodiment 4 includes an ECU main body 10A and a lid 50. The ECU main body 10A includes a circuit board 20 and a heat sink 40 that supports the circuit board 20.

As shown in fig. 51 and 52, the lid 50 includes a top plate 51, an outer peripheral portion 52 provided on a peripheral edge of the top plate 51, and a connector CNT provided on the top plate 51. The outer peripheral portion 52 rises from the peripheral edge of the top plate 51 toward the radiator 40. The connector CNT has a1 st connector CNT1, a2 nd connector CNT2, and a3 rd connector CNT 3. Each of the 1 st connector CNT1, the 2 nd connector CNT2, and the 3 rd connector CNT3 has a housing CNTE and a plurality of terminals CNTP arranged inside the housing CNTE. The top plate 51 has a1 st surface 51a facing the circuit board 20 mounted on the heat sink 40 and a2 nd surface 51b located opposite to the 1 st surface 51 a. The exterior unit CNTE of the 1 st connector CNT1, the 2 nd connector CNT2, and the 3 rd connector CNT3 protrudes from the 2 nd surface 51b of the top plate 51 toward the outside of the lid 50 (for example, toward the opposite side of the circuit board 20 via the top plate 51). The 1 st connector CNT1, the 2 nd connector CNT2, and the 3 rd connector CNT3 are connected to the circuit substrate 20 from the outside of the heat sink 40. The 1 st connector CNT1, the 2 nd connector CNT2, and the 3 rd connector CNT3 are disposed outside the electric motor 30 as viewed in the Z-axis direction.

In embodiment 4, the lid body 50A is composed of a top plate 51 and an outer peripheral portion 52. The top plate 51 and the outer peripheral portion 52 are integrally formed. The lid body 50A and the exterior unit CNTE are also integrally formed. The cover 50 is made of metal or resin, for example. The top plate 51, the outer peripheral portion 52, and the exterior portion CNTE are integrally formed by resin molding. The terminal CNTP is made of metal.

The 1 st connector CNT1 is used for power supply. The 1 st connector CNT1 has, for example, two terminals CNTP. Of the two terminals CNTP of the 1 st connector CNT1, one terminal is a power supply terminal Tdc (see fig. 6), and the other terminal is a power supply terminal Tgnd (see fig. 6). The power supply terminal Tdc is used to supply a power supply voltage Vdc to the power supply device 83 (see fig. 2). The power supply terminal Tgnd is used to supply a negative power supply voltage (for example, a reference voltage such as ground) of the power supply device 83. Power wires PW (see fig. 2) for transmitting power from power supply device 83 are connected to power supply terminals Tdc and Tgnd in 1 st power circuit 25A and 2 nd power circuit 25B, respectively.

The 2 nd connector CNT2 and the 3 rd connector CNT3 are used to input and output signals or data. For example, the 2 nd connector CNT2 is a CAN terminal for CAN communication. The 3 rd connector CNT3 is an input/output terminal for inputting/outputting data by a method other than CAN communication. A signal transmission line for transmitting input and output signals such as the steering torque signal T and the vehicle speed signal SV is connected to the control arithmetic unit 241 (see fig. 6) of the control circuit 24 via the 2 nd connector CNT2 and the 3 rd connector CNT 3.

As shown in fig. 59, the substrate main body 21 is provided with a plurality of through holes 21H1, 21H3, 21H6, 21H7 penetrating the substrate main body 21 between the 1 st surface 21a and the 2 nd surface 21 b. The through holes 21H1 are for insertion of screws for fixing the circuit substrate 20 to the heat sink 40. The through hole 21H3 is inserted by a rod-shaped connecting member 66AL (see fig. 66) for positioning the 1 st coil wiring 321A, 322A, 323A and the 2 nd coil wiring 321B, 322B, 323B (see fig. 27) with respect to the circuit board 20. The via 21H6 includes the 1 st via 21H6A and the 2 nd via 21H 6B. The 1 st through hole 21H6A is inserted with the 1 st coil wiring 321A, 322A, 323A (see fig. 27). The 2 nd through hole 21H6B is inserted with the 2 nd coil wiring 321B, 322B, 323B (see fig. 27).

The through hole 21H7 is inserted with a terminal CNTP (see fig. 51). For example, the through hole 21H7 includes through holes Hdc, Hgnd, Hcan, and Hio. The through holes Hdc and Hgnd are inserted with the terminal CNTP of the 1 st connector CNT1 (see fig. 51). The through hole Hcan is inserted with a terminal CNTP of the 2 nd connector CNT2 (see fig. 51). The through hole Hio allows the terminal CNTP of the 3 rd connector CNT3 (see fig. 51) to be inserted.

Fig. 60 and 61 are schematic views showing examples of connection of the connector to the circuit board. As shown in fig. 60, the terminals CNTP of the 1 st connector CNT1, the 2 nd connector CNT2, and the 3 rd connector CNT3 (see fig. 51) are disposed on the 1 st surface 20a side of the circuit board 20. The 1 st connector CNT1, the 2 nd connector CNT2, and the 3 rd connector CNT3 have a coupling member CNTB for coupling a plurality of adjacent terminals CNTP to each other. The plurality of terminals CNTP are arranged adjacent to each other in the Y direction in a state of being separated from each other by the coupling member CNTB. For example, the terminals CNTP of the 1 st connector CNT1, the 2 nd connector CNT2, and the 3 rd connector CNT3 are coupled by a coupling member CNTB for each of the 1 st connector CNT1, the 2 nd connector CNT2, and the 3 rd connector CNT 3. Alternatively, the terminals CNTP of the 1 st connector CNT1, the 2 nd connector CNT2, and the 3 rd connector CNT3 may be collectively connected by 1 connecting member CNTB.

As shown in fig. 60, the plurality of terminals CNTP connected by the connecting member CNTB are inserted into the through holes 21H7 of the substrate body 21 with their tip portions TP facing the circuit board 20. As shown in fig. 61, when the tip portions TP of the plurality of terminals CNTP reach the 2 nd surface 21b side of the substrate body 21, the plurality of terminals CNTP are connected to the circuit board 20, respectively.

Fig. 62 is a front view showing a configuration example of a heat sink according to embodiment 4. Fig. 63 is a rear view showing a configuration example of a heat sink according to embodiment 4. Fig. 64 is a perspective view of the heat sink of embodiment 4 from the 2 nd surface side showing the 1 st raised part, the 2 nd raised part and the recessed part provided on the 1 st surface side. Fig. 65 is a view showing the 1 st raised part, the 2 nd raised part, and the recessed part provided on the 1 st surface side of the heat sink of embodiment 4, and an electronic component mounted on a circuit board, as seen in perspective from the 2 nd surface side of the heat sink.

As shown in fig. 59 and 62, the heat sink 40 has recesses 47A, 47B, and 47C on the 1 st surface 40a side. The recess 47A is provided at a position facing the 1 st connector CNT (see fig. 54). The recessed portion 47A is provided with, for example, a tip portion TP (see fig. 61) of a terminal CNTP (e.g., power supply terminals Tdc, Tgnd) of the 1 st connector CNT 1. The recess 47B is provided at a position facing the 2 nd connector CNT (see fig. 54). The recessed portion 47B is disposed, for example, at a distal end portion TP of a terminal CNTP (for example, CAN terminal) included in the 2 nd connector CNT 2. The recess 47C is provided at a position facing the 3 rd connector CNT (see fig. 54). The recessed portion 47C is disposed, for example, at a tip portion TP of a terminal CNTP (for example, an input/output terminal other than a CAN terminal) included in the 3 rd connector CNT 3. As shown in fig. 62 to 65, the heat sink 40 has a through hole 48. The through hole 48 is inserted with the 1 st coil wiring 321A, 322A, 323A and the 2 nd coil wiring 321B, 322B, 323B (see fig. 54).

Fig. 66 is a perspective view showing a cross section of the electric drive device taken along line a 9-a 10 in fig. 52. Fig. 67 is a sectional view of the electric drive device taken along line B3-B4 in fig. 53. As shown in fig. 66 and 67, in embodiment 4, the electric drive device 1 also includes the 1 st coil wiring lines 321A, 322A, and 323A, the 2 nd coil wiring lines 321B, 322B, and 323B, the 1 st coupling member 67, and the 2 nd coupling member 68. The 1 st connecting member 67 connects the 1 st portions WP1 of the 1 st coil wires 321A, 322A, 323 and the 2 nd coil wires 321B, 322B, 323B to each other. The 2 nd connecting member 68 connects the 2 nd portions WP2 of the 1 st coil wire 321A, 322A, 323A and the 2 nd coil wire 321B, 322B, 323B to each other. The 1 st coupling member 67 and the 2 nd coupling member 68 are each formed of an insulating resin. The 1 st coil wiring 321A, 322A, 323A and the 2 nd coil wiring 321B, 322B, 323B are adjacently disposed in the X direction in a state of being separated from each other by the 1 st coupling member 67 and the 2 nd coupling member 68.

The electric motor 30 has, for example, 31 st terminal pieces 371, 372, 373 connected to the 1 st coil group Gr1 and 32 nd terminal pieces (not shown) connected to the 2 nd coil group Gr 2. When the heat sink 40 is attached to the electric motor 30 via the adapter 60, the 3 rd portions WP3 of the 1 st coil wires 321A, 322A, 323A are pressed against and brought into contact with the 1 st terminal pieces 371, 372, 373, respectively. In addition, the 3 rd portions WP3 of the 2 nd coil wirings 321B, 322B, 323B are also pressed against and brought into contact with the 2 nd terminal piece, not shown. Thus, the 1 st coil wiring 321A, 322A, 323A is connected to the 1 st coil group Gr1 via the 1 st terminal pieces 371, 372, 373, and the 2 nd coil wiring 321B, 322B, 323B is connected to the 2 nd coil group Gr2 via the 2 nd terminal piece. The 3 rd position WP3 and the 1 st terminal piece 371, 372, 373 or the 3 rd position WP3 and the 2 nd terminal piece may be joined by resistance welding or laser welding.

As shown in fig. 27, the bent portions WP12 of the 1 st coil wires 321A, 322A, 323A are disposed inside the protruding portions 62 of the adapter 60. The 2 nd coil wiring 321B, 322B, 323B also has the bent portion WP12 disposed inside the protruding portion 62.

Fig. 68 is a perspective view showing an example of the quick attachment mechanism according to embodiment 4.

As shown in fig. 68, in embodiment 4, the ECU10 also includes a quick-attachment mechanism 55 for attaching the lid 50 to the radiator 40. The quick attachment mechanism 55 includes, for example, an engaging portion 521 and an engaged portion 421 engageable with the engaging portion 521. The locking portion 521 is provided on the outer peripheral portion 52 of the cover 50. The locked portion 421 is provided on the outer peripheral portion 42 of the heat sink 40. The locking portion 521 is provided at a position overlapping with the locked portion 421 in the Z direction when the cover 50 is attached to the heat sink 40. The process of attaching the lid 50 to the heat sink 40 is the same as in embodiment 1.

As described above, the electric drive device 1 according to embodiment 4 includes the electric motor 30 and the ECU10 provided on the opposite side of the shaft 31 from the load to drive and control the electric motor 30. The ECU10 includes: a magnet 32 located at an end of the shaft 31 on the opposite side to the load; a circuit board 20 positioned on the opposite side of the shaft 31 from the load and arranged on an extension of the shaft 31 in the axial direction (for example, the Z direction); a cover 50 covering the circuit board 20; and a connector CNT connected to the circuit substrate 20. The exterior portion CNTE of the connector CNT is integrally formed with the cover 50.

By integrating the cover body 50A and the exterior unit CNTE, the number of components of the electric drive device 1 can be reduced.

The cover 50 has a1 st surface 51a facing the circuit board 20 and a2 nd surface 51b located opposite to the 1 st surface 51 a. The exterior portion CNTE of the connector CNT protrudes from the 2 nd surface 51b to the outside of the cover 50. Thus, signal transmission lines (for example, signal transmission lines for transmitting the steering torque signal T, the vehicle speed signal SV, and the like) located outside the electric drive device can be connected to the circuit board 20 from the cover 50 side via the connector CNT.

In addition, in the Z direction which is the normal direction of the circuit substrate 20, the 1 st connector CNT1, the 2 nd connector CNT2, and the 3 rd connector CNT3 are all separated from the 1 st coil wiring 321A, 322A, 323A and the 2 nd coil wiring 321B, 322B, 323B. When viewed from the Z direction, none of the 1 st connector CNT1, the 2 nd connector CNT2, and the 3 rd connector CNT3 overlaps with the 1 st coil wiring 321A, 322A, 323A, and the 2 nd coil wiring 321B, 322B, 323B. Thus, in the circuit board 20, the region (for example, the through hole 21H7) to which the 1 st connector CNT1, the 2 nd connector CNT2, and the 3 rd connector CNT3 are connected and the region (for example, the through hole 21H6) to which the 1 st coil wiring 321A, 322A, 323A, or the 2 nd coil wiring 321B, 322B, 323B is connected can be arranged separately from each other. This can prevent the circuit board 20 from being excessively densely arranged with the through holes 21H6 and 21H 7.

Further, the connector CNT is disposed outside the electric motor 30 as viewed from the Z-axis direction. This enables the connector CNT to be separated from the rotation angle sensor 23 a. For example, the 1 st connector CNT1 includes a power supply terminal Tdc. When the torque sensor 94 detects a large steering torque, a large amount of current PSC (see fig. 59) flows from the power supply terminal Tdc to the 1 st power circuit 25A and the 2 nd power circuit 25B, and a strong magnetic field may be generated around the power supply terminal. However, in the electric drive device 1 according to embodiment 4, the 1 st connector CNTP1 is disposed outside the electric motor 30 when viewed in the Z-axis direction, and therefore the distance between the power supply terminal Tdc and the rotation angle sensor 23a is large. Therefore, even if a strong magnetic field is generated around the power supply terminal Tdc, the magnetic field can be made to have no influence on the detection accuracy of the rotation angle sensor 23a as much as possible.

Embodiment 4 has been described above, but the present invention is not limited to the above. For example, although embodiment 4 has the structure in which the 1 st connector CNT1, the 2 nd connector CNT2, and the 3 rd connector CNT3 are aligned in a row, the 1 st connector CNT1, the 2 nd connector CNT2, and the 3 rd connector CNT3 may not be aligned in a row. For example, the 1 st connector CNT1 may be provided at a position deviated from the direction in which the 2 nd connector CNT2 and the 3 rd connector CNT3 are aligned.

Description of the reference numerals

1. An electric drive device; 10. an ECU (electronic control unit); 10A, ECU a main body; 20. a circuit substrate; 21. a substrate main body; 23. a detection circuit; 23a, a rotation angle sensor; 24. a control circuit; 25A, 1 st power circuit; 25B, 2 nd power circuit; 30. an electric motor; 31. a shaft; 32. a magnet; 37. 1 st coil; 38. a2 nd coil; 40. a heat sink; 42. 52, an outer peripheral portion; 44. 44A, 44B, (annular) wall portions; 49. a choke coil; 50. a cover body; 51. a top plate; 53. a valve; 55. a rapid assembly mechanism; 56. an adhesive; 57. 57A, 57B, a cap; 60. an adapter; 70. a2 nd rack and pinion mechanism; 71A, a2 nd pinion shaft; 71B, pinion 2; 71C, 2 nd rack; 72. a pull rod; 75A, a worm; 75B, a worm wheel; 75. a reduction gear; 82. a vehicle speed sensor; 83. a power supply device; 84. an ignition switch; 91. a steering wheel; 92. a steering shaft; 92A, an input shaft; 92B, an output shaft; 92C, a torsion bar; 94. a torque sensor; 96. a universal joint; 97. an intermediate shaft; 97A, an upper shaft; 97B, a lower shaft; 98. a universal joint; 99. the 1 st gear rack mechanism; 99A, 1 st pinion shaft; 99B, pinion 1; 99C, a rack shaft; 99D, 1 st rack; 100. an electric power steering apparatus; 101. a vehicle; 241. a control calculation unit; 242. a gate drive circuit; 243. a blocking drive circuit; 251. an inverter circuit; 253A, 253B, electrolytic capacitors; 281. 282A, 282B, 291, 292, electronic components; 283. a thermistor; 321A, 322A, 323A, and 1 st coil wiring; 321B, 322B, 323B, 2 nd coil wiring; 371. 372, 373, 1 st terminal plate; 411. the 1 st bump; 412A, 412B, the 2 nd bulge; 421. an engaged part; 422. a groove part; 431. 1 st heat dissipation material; 432. a2 nd heat dissipating material; 433. a3 rd heat dissipating material; 442. 442A, 442B, 442C, ribs; 445. an elastic ring; 447. a magnetic shield layer; 521. a card-holding section; 930. a housing; 931. a stator core; 931a, a back yoke; 931b, tooth portions; 932. a rotor; 932a, a rotor yoke; 932b, a magnet; ax, axial; CNTs, connectors; CNTB, a connecting member; CNTE, an exterior part; CNTP, terminals; CNT1, connector No. 1; CNT2, 2 nd connector; CNT3, No. 3 connector; gr1, coil group 1; gr2, coil group 2; PW, power wiring; SV, vehicle speed signals; t, a steering torque signal; tdc, Tgnd, power supply terminal; WP1, position 1; WP12, bend; WP2, position 2; WP3, position 3; θ m, motor electrical angle.

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Electric drive device and electric power steering device

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