阅读说明：本技术 马达制造装置以及马达的制造方法 (Motor manufacturing device and motor manufacturing method ) 是由 古馆荣次 于 2018-04-05 设计创作，主要内容包括：马达的制造装置(10)具备操作部(15)、磁化部(17)、磁性屏蔽部件(71)以及控制部(50)。操作部(15)将未磁化的传感器磁铁部(31)安装于轴(33)的轴体的端部。在将转子(34)保持在规定的旋转位置的状态下,磁化部(17)在相对于主磁铁(35)的磁极具有规定的旋转角度的磁极位置对传感器磁铁部(31)进行磁化。磁性屏蔽部件(71)至少在对传感器磁铁部进行磁化时,配置于主磁铁(35)与传感器磁铁部(31)之间。控制部(50)控制操作部(15)、磁性屏蔽部件(71)以及磁化部(17)的动作。(A motor manufacturing device (10) is provided with an operation unit (15), a magnetization unit (17), a magnetic shield member (71), and a control unit (50). The operation unit (15) has an unmagnetized sensor magnet unit (31) attached to the end of the shaft body of the shaft (33). The magnetizing unit (17) magnetizes the sensor magnet unit (31) at a magnetic pole position having a predetermined rotation angle with respect to the magnetic pole of the main magnet (35) while the rotor (34) is held at a predetermined rotation position. The magnetic shield member (71) is disposed between the main magnet (35) and the sensor magnet (31) at least when the sensor magnet is magnetized. The control unit (50) controls the operation of the operation unit (15), the magnetic shield member (71), and the magnetization unit (17).)

1. A motor manufacturing apparatus includes:

a stator including a field coil;

a rotor rotatably provided on a radial inner side of the stator, the rotor having a shaft and a main magnet; and

a sensor magnet portion for detecting a rotational position of the rotor,

wherein the content of the first and second substances,

the motor manufacturing apparatus includes:

a sensor magnet mounting portion that mounts an unmagnetized sensor magnet portion to an end portion of a shaft body of the shaft;

a magnetization unit configured to magnetize the sensor magnet unit at a magnetic pole position having a predetermined rotation angle with respect to a magnetic pole of the main magnet in a state where the rotor is held at a predetermined rotation position;

a magnetic shield member disposed between the main magnet and the sensor magnet at least when the sensor magnet is magnetized; and

and a control unit that controls operations of the sensor magnet mounting unit, the magnetic shield member, and the magnetization unit.

2. The motor manufacturing apparatus according to claim 1,

the control unit holds the rotor at the predetermined rotational position by energization of the exciting coil.

3. The motor manufacturing apparatus according to claim 1 or 2, wherein,

the magnetic shield member has a first member and a second member separable in a direction perpendicular to a shaft body of the shaft,

the first member and the second member may be disposed so as to surround a shaft body of the shaft.

4. The motor manufacturing apparatus according to any one of claims 1 to 3, wherein,

the motor manufacturing apparatus includes a nonmagnetic member surrounding an outer periphery of the magnetized portion.

5. The motor manufacturing apparatus according to any one of claims 1 to 4, wherein,

when the sensor magnet portion is magnetized, the magnetized portion is disposed opposite to the sensor magnet portion on the opposite side of the end portion of the shaft body of the shaft.

6. The motor manufacturing apparatus according to any one of claims 1 to 5, wherein,

the motor manufacturing apparatus includes a shaft holding portion that holds and fixes a shaft body of the shaft.

7. The motor manufacturing apparatus according to claim 6,

the shaft holding portion has an engaging portion that engages with a concave portion or a convex portion formed in a shaft body of the shaft.

8. The motor manufacturing apparatus according to any one of claims 1 to 7, wherein,

the motor manufacturing apparatus includes:

an arm portion to which the magnetizing portion is attached at one end portion; and

a support portion that supports the other end portion of the arm portion,

the magnetizing unit is attached to the arm unit so that a position and an angle of the magnetizing unit with respect to the shaft are constant when the sensor magnet unit is magnetized.

9. The motor manufacturing apparatus according to any one of claims 1 to 8, wherein,

the magnetizing portion includes a magnetizing coil or a magnetizing yoke.

10. A method for manufacturing a motor, the motor comprising:

a stator including a field coil;

a rotor rotatably provided on a radial inner side of the stator, the rotor having a shaft and a main magnet; and

a sensor magnet portion for detecting a rotational position of the rotor,

wherein the content of the first and second substances,

the manufacturing method of the motor comprises the following steps:

mounting an unmagnetized sensor magnet portion to an end portion of a shaft body of the shaft;

disposing a magnetic shielding member between the main magnet and the sensor magnet; and

the sensor magnet portion is magnetized at a magnetic pole position having a predetermined rotation angle with respect to the magnetic pole of the main magnet in a state where the rotor is held at a predetermined rotation position.

11. The method of manufacturing a motor according to claim 10,

the rotor is held at the predetermined rotational position by energization of the exciting coil.

12. The method of manufacturing a motor according to claim 11,

the shaft holding portion holds the shaft body of the shaft at the predetermined rotational position at least when the energization of the exciting coil is completed.

13. The method of manufacturing a motor according to any one of claims 10 to 12, wherein,

the magnetic shield member has a first member and a second member separable in a direction perpendicular to a shaft body of the shaft,

the first member and the second member are disposed so as to surround a shaft body of the shaft when the sensor magnet portion is magnetized.

14. The method of manufacturing a motor according to any one of claims 10 to 13, wherein,

the sensor magnet part comprises a magnetized magnet part and a pin part provided with the magnet part,

the shaft includes a recess extending axially inwardly from the end portion,

the sensor magnet portion is attached to the shaft by pressing the pin portion of the sensor magnet portion into the recess.

15. The method of manufacturing a motor according to any one of claims 10 to 13, wherein,

the sensor magnet portion includes a holder portion,

the holder portion includes a cylindrical portion having a cylindrical shape,

the sensor magnet portion is attached to the shaft by pressing an end portion of a shaft body of the shaft into the cylindrical portion.

16. The method of manufacturing a motor according to any one of claims 10 to 13, wherein,

the sensor magnet portion is attached to an end portion of a shaft body of the shaft by bonding.

Technical Field

The present invention relates to a motor manufacturing apparatus and a motor manufacturing method.

Background

The brushless motor includes a rotor rotation position detection unit. The means for detecting the rotational position of the rotor includes, for example, a sensor magnet portion fixed to a shaft that is the rotational axis of the rotor, and a magnetic sensor disposed so as to face the sensor magnet portion. The detection unit detects a change in a magnetic field of a sensor magnet portion that rotates in synchronization with the rotor by a magnetic sensor, thereby detecting a rotational position of the rotor.

Disclosure of Invention

Problems to be solved by the invention

When a current is applied to the coil of the stator to rotate the motor, a current flows through a lead wire connecting the control board and the coil, and a magnetic field is formed around the lead wire. Since the magnetic sensor disposed on the control board is affected by the magnetic field, the detection accuracy of the rotational position is lowered and the torque ripple is increased. In order to prevent an increase in torque ripple, the detection signal is sometimes filtered by software to adjust the rotational position. However, when the rotor is manufactured, if the magnetization position (the position of the magnetic pole in the circumferential direction) of the sensor magnet portion in the rotational direction with respect to the rotational position of the magnet of the rotor is deviated, the magnetic field affecting the magnetic sensor is also deviated. As a result, the filtering software needs to be adjusted for each motor, which increases the manufacturing cost.

The invention aims to provide a motor manufacturing device and a motor manufacturing method which can manufacture a motor capable of maintaining the detection accuracy of the rotation position of the motor and inhibiting torque fluctuation.

Means for solving the problems

A motor manufacturing apparatus according to an exemplary embodiment of the present application is an apparatus for manufacturing a motor, the motor including: a stator including a field coil; a rotor rotatably provided on a radial inner side of the stator, the rotor having a shaft and a main magnet; and a sensor magnet portion for detecting a rotational position of the rotor. A motor manufacturing apparatus includes a sensor magnet mounting portion, a magnetizing portion, a magnetic shield member, and a control portion. The sensor magnet mounting portion mounts the unmagnetized sensor magnet portion to an end portion of the shaft body of the shaft. The magnetization unit magnetizes the sensor magnet unit at a magnetic pole position having a predetermined rotation angle with respect to the magnetic pole of the main magnet in a state where the rotor is held at a predetermined rotation position. The magnetic shield member is disposed between the main magnet and the sensor magnet portion at least when the sensor magnet portion is magnetized. The control unit controls the operations of the sensor magnet mounting unit, the magnetic shield member, and the magnetizing unit.

Effects of the invention

According to the exemplary embodiments of the present application, a motor that can suppress torque ripple while maintaining detection accuracy of the rotational position of the motor can be manufactured.

Drawings

Fig. 1 is a sectional view of a motor manufacturing apparatus according to embodiment 1.

Fig. 2A is a perspective view of the sensor magnet portion.

Fig. 2B is a view showing a process for attaching the sensor magnet portion to the shaft.

Fig. 3 is a view schematically showing a magnetizing unit of the motor manufacturing apparatus according to embodiment 1.

Fig. 4 is a diagram showing a positional relationship between the main magnet of the rotor and the sensor magnet portion.

Fig. 5 is a control block diagram of the motor manufacturing apparatus.

Fig. 6 is a flowchart showing the operation of the motor manufacturing apparatus.

Fig. 7 is a view showing a manufacturing apparatus of a motor according to a modification.

Fig. 8A is a perspective view of a sensor magnet portion of the motor of fig. 7.

Fig. 8B is a sectional view of the sensor magnet portion.

Fig. 8C is a sectional view showing a state in which the sensor magnet portion is attached to the shaft.

Fig. 9 is a view showing a manufacturing apparatus of a motor according to another modification.

Fig. 10 is a sectional view of a motor manufacturing apparatus according to embodiment 2.

Fig. 11 is a partial plan view of the motor manufacturing apparatus of fig. 10.

Fig. 12 is a sectional view of a motor manufacturing apparatus according to another embodiment.

Fig. 13 is a partial plan view of the motor manufacturing apparatus of fig. 12.

Fig. 14 is a sectional view showing a part of a motor manufacturing apparatus in another embodiment.

Detailed Description

Hereinafter, embodiments of the present invention will be described with reference to the drawings. The scope of the present invention is not limited to the following embodiments, and may be arbitrarily changed within the scope of the technical idea of the present invention.

In the drawings, an XYZ coordinate system is appropriately illustrated as a 3-dimensional orthogonal coordinate system. In the XYZ coordinate system, the Z-axis direction is the up-down direction. The X-axis direction is the left-right direction of fig. 1 in the direction perpendicular to the Z-axis direction. The Y-axis direction is a direction perpendicular to both the X-axis direction and the Z-axis direction. In the following description, unless otherwise specified, a radial direction centered on a central axis (axis of the shaft) extending in the vertical direction (Z-axis direction) will be referred to as a "radial direction", and a circumferential direction centered on the central axis will be referred to as a "circumferential direction". A side radially distant from the center axis is referred to as a radially outer side, and an opposite side thereof is referred to as a radially inner side.

(embodiment mode 1)

[1-1. Structure ]

< Motor >

The motor 30 of embodiment 1 shown in fig. 1 is, for example, a brushless motor. The motor 30 includes a shaft 33, a rotor 34, a main magnet 35, a stator 36, a bus bar 37, an external connection terminal 38, and a case 39.

The shaft 33 is disposed at a position of a central axis of the motor 30, and is inserted into a cylindrical rotor core 34 a. As shown in fig. 2B, a recess 33a extending in the Z-axis direction is formed at the axial end of the shaft 33. The recess 33a is fitted with a pin portion 31b of the sensor magnet portion 31 described later.

The rotor 34 includes a rotor core 34a and a main magnet 35 attached to a radially outer side of the rotor core 34 a. As shown in fig. 4, the main magnet 35 is provided with N poles and S poles alternately in the circumferential direction. The number of poles of the main magnet 35 is 8. The main Magnet 35 of the rotor shown in the present embodiment is a Surface Permanent Magnet (SPM) fixed to the Surface of the rotor core, but is not limited thereto. The main Magnet 35 may be replaced with an IPM (interior permanent Magnet) fixed inside the rotor core.

The stator 36 is disposed near the radially outer side of the rotor 34. The stator 36 is an annular member having an annular stator core 36a, and the stator core 36a has teeth (not shown) provided at equal intervals in the circumferential direction and a core back (not shown) connecting the teeth. The teeth extend from the core back toward the radially inner side. The teeth of the stator core 36a are wound with three-phase excitation coils 32 including U-phase, V-phase, and W-phase, for example.

The bus bar 37 is a conductive member. In the present embodiment, the bus bar 37 is a plate-shaped member made of metal. The bus bar 37 is a wiring for connecting the excitation coil 32 and the external connection terminal 38 and supplying current. The external connection terminals 38 are electrically connected to an external power supply (not shown), and supply current to the excitation coil 32 through the bus bars 37. The shape, material, and the like of the bus bar 37 are not limited to the above. The bus bar 37 may be connected to the exciting coil 32, the external connection terminal 38, or the like via a control board described later.

The housing 39 is provided radially outside the stator core 36 a. The housing 39 is cylindrical and has one side opened in the Z-axis direction. In the present embodiment, the housing 39 has a cylindrical shape. The shape of the case is not particularly limited, and may be a rectangular parallelepiped or a combination of a rectangular parallelepiped and a cylinder, in addition to a cylinder. The case 39 is made of aluminum, for example, and is formed by die casting, but may be formed by other methods such as cutting and forging. The material of the case 39 may be other metal material such as iron in addition to aluminum, and is not particularly limited.

Although not shown, the motor 30 further includes a control board. The control board has a magnetic sensor (not shown) facing the sensor magnet portion 31 attached to the shaft 33. In the present embodiment, the magnetic sensor is an MR sensor, but may be a hall element or the like. The magnetic sensor detects a change in the magnetic field of the sensor magnet portion 31 rotating together with the shaft 33. This enables detection of the rotational position of the rotor 34.

The control board further includes a microcontroller including a control circuit and the like. The microcontroller is capable of calculating the rotational position of the rotor 34 from the output of the magnetic sensor. This enables the driving of the motor 30 to be controlled in accordance with a command from the microcontroller. In other words, the rotation and stop of the rotor 34 can be controlled. Therefore, for example, by controlling the energization of the three-phase field coils 32, the rotor 34 can be rotated to a predetermined position, and the magnetic poles of the main magnets 35 can be set to a predetermined rotational position. Although not shown, the control board includes other circuits such as a drive circuit and electronic components.

The motor 30 further includes a sensor magnet portion 31.

< sensor magnet part >

The sensor magnet portion 31 is attached to an end portion of the shaft 33. As shown in fig. 2A, the sensor magnet portion 31 includes a columnar magnet portion 31a and a columnar pin portion 31b having an outer diameter smaller than that of the magnet portion 31 a. The pin portion 31b includes a grip portion 31 e. The magnet portion 31a is a permanent magnet having two poles of N and S. One axial end of the pin portion 31b is attached to the inner peripheral surface of the magnet portion 31 a. More specifically, magnet portion 31a has a through hole penetrating in the axial direction. At least a part of the pin portion 31b is fixed in the through hole by press-fitting, bonding, or the like. The axial end of the pin portion 31b is positioned on the axial side of the opening of the through hole of the magnet portion 31a on the axial side. The other end in the axial direction of the pin portion 31b is positioned on the other axial side of the through hole on the other axial side of the magnet portion 31 a. The grip portion 31e is an end portion located on the other axial side of the magnet portion 31 a. The gripping portion 31e is gripped by an operation portion 15 described later.

Magnet portion 31a is not magnetized, that is, is in an unmagnetized state before sensor magnet portion 31 is attached to shaft 33. As described later, magnet portion 31a is magnetized at a predetermined magnetic pole position after sensor magnet portion 31 is attached to shaft 33.

< apparatus for manufacturing motor >

As shown in fig. 1, the motor manufacturing apparatus 10 includes an arm portion 11, a support member 13, a magnetizing portion 17, a magnetic shield member 71, a shield support member 72, and a base portion 19. The base portion 19 supports the motor 30 and the support member 13 to be manufactured. The motor manufacturing apparatus 10 further includes an operation unit 15 shown in fig. 2B.

The arm 11 supports the magnetized portion 17 at one end portion, and is moved in the X-axis direction, the Y-axis direction, and the Z-axis direction by the control of the control portion 50 shown in fig. 5. The other end of the arm 11 is supported by a support member 13.

As shown in fig. 1 and 3, magnetizing unit 17 moves above sensor magnet unit 31 attached to shaft 33, and magnetizes sensor magnet unit 31. The magnetizing unit 17 is, for example, a magnetizing yoke. The magnetizing unit 17 includes a yoke 171 forming a magnetic circuit and a coil unit 173 generating a magnetic field by energization. The magnetization unit 17 magnetizes the magnet unit 31a in a state where the sensor magnet unit 31 is attached to the shaft 33. The magnetization direction for this magnetization is predetermined in accordance with the positional relationship between the sensor magnet portion 31 and the magnetization portion 17. As a result of the magnetization by the magnetization portion 17, as shown in fig. 4, the magnetic pole position of the sensor magnet portion 31 has a predetermined angle θ with respect to the predetermined rotational position of the rotor 34 to be held.

The operation unit 15 is attached to a predetermined moving means (not shown), and is moved in the X-axis direction, the Y-axis direction, and the Z-axis direction under the control of the control unit 50 shown in fig. 5. As shown in fig. 2B, the operation unit 15 grips the grip portion 31e of the sensor magnet portion 31 and presses the pin portion 31B into the recess 33a of the shaft 33. Thereby, the sensor magnet portion 31 is attached to the shaft 33.

As shown in fig. 1, the magnetic shield member 71 is attached to the shield support member 72, and the shield support member 72 is attached to the arm portion 11. The magnetic shield member 71 is formed of a magnetic material. The magnetic shield member 71 moves together with the magnetized portion 17, and is disposed between the main magnet 35 and the sensor magnet portion 31 as shown in fig. 1. The magnetic shield member 71 prevents the magnetic force of the main magnet 35 from affecting the magnetization of the sensor magnet portion 31.

As shown in fig. 1, the shield support member 72 is attached to the arm portion 11 and supports the magnetic shield member 71. The shield support member 72 is disposed so as to surround the outer periphery of the magnetized portion 17, and moves together with the magnetized portion 17. The shield support member 72 is formed of a non-magnetic material, not a magnetic body. This reduces the magnetic force generated around the magnetized portion 17, and stabilizes the magnetism of the magnetized portion 17.

< control part >

The magnetization operation is performed by the control unit 50 shown in fig. 5 after the sensor magnet unit 31 is attached to the motor manufacturing apparatus 10. The control unit 50 includes, for example, a microcontroller, a ROM, a processor, a RAM, and the like. The microcontroller is disposed on the control substrate, and includes a control circuit and the like. The ROM stores, for example, a control program for the operation of the motor manufacturing apparatus 10. The processor controls the operation of the motor manufacturing apparatus 10, for example, according to a control program. The RAM temporarily stores various data in control, for example.

As shown in fig. 5, the control unit 50 controls the operation unit driving unit 51, the magnetization unit moving unit 52, the magnetization driving unit 53, and the rotor rotation control unit 55.

The control unit 50 generates and outputs a control signal command to the operation unit drive unit 51. The operation unit driving unit 51 instructs the operation unit 15 to be driven according to a control signal from the control unit 50. The operation unit driving unit 51 is a driving mechanism for moving the operation unit 15 in, for example, the X-axis direction, the Y-axis direction, and the Z-axis direction shown in fig. 1 and 2. As shown in fig. 2B, the operation unit driving unit 51 causes the operation unit 15 to grip the sensor magnet unit 31, thereby attaching the sensor magnet unit 31 to the shaft 33.

The control unit 50 generates and outputs a control signal command for the magnetization unit moving unit 52. The magnetization unit moving unit 52 drives the arm unit 11 to which the magnetization unit 17 is attached in accordance with a control signal command from the control unit 50. The magnetized portion moving unit 52 is a driving mechanism for moving the arm portion 11 in, for example, the X-axis direction, the Y-axis direction, and the Z-axis direction shown in fig. 1 and 2.

The control unit 50 generates and outputs a control signal command for the magnetization driving unit 53. The magnetization driving unit 53 generates a magnetic field in a predetermined direction by energizing the magnetization unit 17 in accordance with a control signal command from the control unit 50.

The control unit 50 generates and outputs a control signal command to the rotor rotation control unit 55. The rotor rotation control unit 55 controls energization of the stator 36, that is, rotation of the rotor 34, via a microcontroller or the like provided on a control board of the motor 30. For example, as described above, the rotor 34 is rotated and stopped by controlling the energization to the exciting coil 32. As a result, the magnetic poles of the main magnet 35 are at predetermined rotational positions.

[1-2. actions ]

Fig. 6 is a flowchart showing the magnetization operation from the installation of the sensor magnet portion 31, which is mainly executed by the control portion 50 of the motor manufacturing apparatus.

First, the rotor 34 is held at a predetermined rotational position in advance (step S101). Next, the operation unit 15 is moved, and the sensor magnet unit 31 to be the target is held by the operation unit 15 (step S102). The operation unit 15 is moved to move the sensor magnet unit 31 to the end of the shaft 33 as shown in fig. 2B (step S103). The pin portion 31b of the sensor magnet portion 31 is attached to the recess 33a of the shaft 33 by press fitting by the operation portion 15 (step S104).

The operation unit 15 releases the sensor magnet unit 31 and moves it (step S105). The arm portion 11 is moved, and the magnetic shielding member 71 and the magnetized portion 17 are moved (step S106). As a result, as shown in fig. 1 and 3, the magnetization unit 17 is disposed above the sensor magnet unit 31. At this time, the magnetic shield member 71 supported by the arm portion 11 is disposed below the sensor magnet portion 31. The magnetization unit 17 is driven, and the magnet unit 31a of the sensor magnet unit 31 is magnetized (step S107). Specifically, a current flows through the coil portion 173 of the magnetization unit 17, and a magnetic field having a predetermined magnetization direction is generated. The predetermined magnetization direction is adjusted and set in advance in accordance with the positional relationship between the magnetization unit 17 and the sensor magnet unit 31 attached to the shaft 33. That is, the magnetic pole positions of the sensor magnet portion 31 attached to the shaft 33 are all magnetized so as to be constant. As a result, as shown in fig. 4, the magnetic pole position of the sensor magnet portion 31 is at a predetermined angle θ with respect to the predetermined rotational position of the rotor 34 to be held. The predetermined angle θ is a constant angle in the entire motor 30 manufactured by the motor manufacturing apparatus 10. After the magnetization is completed, the arm portion 11 is moved.

The step of holding rotor 34 at the predetermined rotational position (S101) may be performed at any time before sensor magnet portion 31 is magnetized by magnetizing portion 17. For example, the step of holding the rotor 34 at the predetermined rotational position may be performed after the sensor magnet portion 31 is attached to the shaft 33 and before the magnetization starts.

According to embodiment 1, the magnetization unit 17 magnetizes the sensor magnet unit 31 at a magnetic pole position having a predetermined rotation angle with respect to the magnetic pole of the main magnet 35 in a state where the rotor 34 is held at a predetermined rotation position. The magnetic shield member 71 is disposed between the main magnet 35 and the sensor magnet 31 at least when magnetizing the sensor magnet 31. Here, since the sensor magnet portion 31 is magnetized after the unmagnetized sensor magnet portion 31 is attached to the shaft 33, the angle between the sensor magnet portion 31 and the shaft 33 can be easily and accurately aligned.

In particular, with this arrangement, the magnetic field of the sensor magnet portion 31 is affected by the current flowing through the bus bar 37. Therefore, if the rotational positions of the sensor magnet portion 31 and the rotor 34 can be made constant, a motor capable of further effectively suppressing torque ripple can be manufactured. More specifically, the arrangement of the sensor magnet portion 31 affects the detection accuracy of the magnetic sensor. Therefore, by making the rotational positions of the sensor magnet portion 31 and the rotor 34 constant, the positional accuracy of the sensor magnet portion can be improved, and the accuracy of calculating the rotational position from the output of the magnetic sensor by software can be improved. Therefore, torque ripple can be further effectively suppressed at the time of motor driving.

Further, since it is not necessary to perform software adjustment for each assembled motor 30, the manufacturing cost of the motor 30 can be suppressed.

Further, since the magnetic shield member 71 is moved between the main magnet 35 and the sensor magnet portion 31 and then magnetized, the magnetic force of the main magnet 35 can be prevented from affecting the magnetization of the sensor magnet.

According to embodiment 1, the magnetic shield member 71 is supported by the non-magnetic shield support member 72. Therefore, the influence of the magnetic material on the magnetization of the sensor magnet portion 31 can be alleviated.

According to embodiment 1, when sensor magnet portion 31 is magnetized, magnetized portion 17 is disposed opposite to sensor magnet portion 31 on the opposite side of the axial end of shaft 33 to which sensor magnet portion 31 is attached. Therefore, the magnetized portion of the sensor magnet portion 31 and the magnetic shield member 71 can be disposed separately, and thus interference of magnetic force can be prevented.

According to embodiment 1, the arm portion 11 having the magnetized portion 17 attached to one end portion thereof and the support member 13 supporting the other end portion of the arm portion 11 are provided, and the magnetized portion 17 is attached to the arm portion 11 so that the position and angle thereof with respect to the shaft 33 are constant when the sensor magnet portion 31 is magnetized. Therefore, the sensor magnet can be magnetized stably and compactly by the magnetizing unit.

According to embodiment 1, since the process from the mounting of the sensor magnet portion 31 to the shaft 33 to the magnetization can be performed using one motor manufacturing apparatus 10, the work time required for assembly, movement of components, and the like can be shortened.

According to embodiment 1, the sensor magnet portion 31 includes a magnet portion 31a having a magnetic pole and a pin portion 31b to which the magnet portion 31a is attached. The shaft 33 includes a recess 33a extending axially inside. The pin portion 31b of the sensor magnet portion 31 is press-fitted into the recess 33a of the shaft 33. Therefore, the sensor magnet portion 31 can be manufactured so that the outer diameter thereof is smaller than the outer diameter of the shaft, and the sensor magnet portion 31 can be attached to the shaft 33 before the motor 30 is assembled, whereby the assembly process of the motor 30 becomes easy.

[1-3. modified examples ]

In embodiment 1 described above, the following modifications can be applied.

[1]

Fig. 7 shows an example of a motor manufacturing apparatus 10 in which a sensor magnet portion 311 of another embodiment is attached to a shaft 331 of a motor 301. As shown in fig. 8A and 8B, the sensor magnet portion 311 of the present modification includes a magnet portion 311a having two magnetic poles and a holder portion 311B that holds the magnet portion 311 a. Holder portion 311b includes a cylindrical portion into which an end portion of shaft 331 shown in fig. 8C is press-fitted. The sensor magnet portion 311 further has a flange portion 311f protruding radially outward. As shown in fig. 8C, flange 311f is gripped by operation unit 151 and attached to an end of shaft 331.

In this example, since the shaft 331 is not required to be processed to form the recess or the like, the manufacturing cost and the working time can be suppressed.

[2]

Fig. 9 shows an example of the motor manufacturing apparatus 10 in which the sensor magnet portion 312 of another embodiment is attached to the shaft 332 of the motor 302. The sensor magnet portion 312 is attached to an end portion of the shaft 332 by bonding.

In this example, the sensor magnet portion 312 can be manufactured so that the outer diameter thereof is smaller than the outer diameter of the shaft 332, in addition to the need for processing the shaft 332 to form a recess or the like, and therefore, the assembly process of the motor is facilitated.

[3]

In embodiment 1 described above, the shield support member 72 that supports the magnetic shield member 71 is formed of a non-magnetic material, but the present invention is not limited to this. The shield support member 72 may be made of a magnetic material as long as it can be disposed so as not to affect the magnetized portion 17.

(embodiment mode 2)

Hereinafter, the same reference numerals are given to components having the same structures or functions as those of embodiment 1, and the description thereof will be omitted.