阅读说明：本技术 电机用滤波装置及电机 (Filter device for motor and motor ) 是由 欧阳鹏 李南 刘磊 于 2021-08-06 设计创作，主要内容包括：提供了电机用滤波装置及电机。电机用滤波装置包括：柔性电路板(10),其具有滤波电路(11)和接地层(12),所述接地层(12)卷绕成圆筒形,所述滤波电路(11)位于所述接地层(12)的内表面侧和/或外表面侧；绝缘管(20),所述柔性电路板(10)卷绕成圆筒形并收纳于所述绝缘管(20)内；第一连接线(30),其连接到所述滤波电路(11)并用于将所述滤波电路(11)连接到待滤波装置(50)；第二连接线(40),其连接到所述滤波电路(11)并用于将所述滤波电路(11)连接到控制单元；以及灌封材料(60),其位于所述绝缘管(20)内,至少使所述滤波电路(11)被绝缘密封。(Provided are a filter device for a motor and the motor. The filtering device for the motor comprises: a flexible circuit board (10) having a filter circuit (11) and a ground layer (12), the ground layer (12) being wound in a cylindrical shape, the filter circuit (11) being located on an inner surface side and/or an outer surface side of the ground layer (12); an insulating tube (20) in which the flexible circuit board (10) is wound in a cylindrical shape and housed; -a first connection line (30) connected to the filtering circuit (11) and intended to connect the filtering circuit (11) to a device to be filtered (50); -a second connection line (40) connected to the filter circuit (11) and intended to connect the filter circuit (11) to a control unit; and a potting material (60) which is located inside the insulating tube (20) and which insulates and seals at least the filter circuit (11).)

1. A filter device for a motor, comprising:

a flexible circuit board (10) having a filter circuit (11) and a ground layer (12), the ground layer (12) being wound in a cylindrical shape, the filter circuit (11) being located on an inner surface side and/or an outer surface side of the ground layer (12);

an insulating tube (20) in which the flexible circuit board (10) is wound in a cylindrical shape and housed;

-a first connection line (30) connected to the filtering circuit (11) and intended to connect the filtering circuit (11) to a device to be filtered (50);

-a second connection line (40) connected to the filter circuit (11) and intended to connect the filter circuit (11) to a control unit; and

a potting material (60) located within the insulating tube (20) to insulate and seal at least the filter circuit (11).

2. Filter device for a motor according to claim 1, characterized in that said first connection line (30) and said second connection line (40) are soldered to said flexible circuit board (10), the soldering points being covered by said potting material (60).

3. The filter device for a motor of claim 1, wherein the potting material is a thermally conductive potting adhesive.

4. A filtering device for electric motors according to claim 1, characterized in that it further comprises, as said device to be filtered (50), a negative temperature coefficient sensor electrically connected to said first connection line (30) and housed in said insulating tube (20), said negative temperature coefficient sensor being coated with said potting material.

5. The filtering device for a motor of claim 1, further comprising:

a first plug connector (70) which is electrically connected to the first connecting line (30) and is used for plug connection with a plug connector of the device to be filtered; and/or

A second plug connector (80) which is electrically connected to the second connecting line (40) and is used for plug connection with the plug connector of the control unit.

6. Filter device for a motor according to claim 5, characterized in that at least a part of the first plug connector (70) and/or the second plug connector (80) is received in the insulating tube (20).

7. A filter device for a motor according to claim 5, wherein the device to be filtered is a negative temperature coefficient sensor or a resolver, and the control unit is a motor control unit.

8. A filter arrangement for a motor according to claim 1, characterised in that the filter circuit (11) comprises surface-mounted devices comprising resistors, capacitors and inductors.

9. An electrical machine, characterized in that it comprises a filter device for an electrical machine according to any one of claims 1 to 8.

10. An electric machine as claimed in claim 9, characterized in that the motor filter means are mounted to the motor housing of the electric machine by means of a band or snap fit.

Technical Field

The application relates to the field of motors, in particular to a filtering device for a motor and a motor.

Background

In pure electric vehicles, some companies use PCB hardboards to filter high frequency harmonics of NTC (Negative Temperature Coefficient) sensors to improve the EMC (Electromagnetic Compatibility) performance of the vehicle. One side of the PCB hard board is connected with the NTC sensor, and the other side of the PCB hard board is connected with a motor control unit (PEU) through a low-voltage plug connector. The high frequency harmonics of the NTC sensor are caused by the motor. There is a filter circuit on the PCB hard board which will filter the high frequency harmonics of the NTC sensor, which will improve the EMC performance of the vehicle.

The above technique has the following problems:

the NTC sensor and the PCB are separate, and the mounting process is complicated;

the separate parts require soldered connections, the solder joints (e.g. of the PCB hardboard to the connecting wires of the NTC sensor, and of the PCB hardboard to the connecting wires of the motor control unit) are exposed to air, with low reliability;

the area of the PCB hard board is large, and special space needs to be reserved for arranging the PCB hard board on the motor shell;

the PCB hardboard needs to be bolted into the motor housing, which adds weight.

Additionally, in some applications, the PCB board may also be connected to a resolver (resolver), or both the resolver and the NTC sensor, with one or more filter channels (filter circuits) on the PCB board filtering high frequency harmonics of the resolver and/or NTC sensor.

In this scheme, in addition to the above-mentioned problems, there are also the following problems:

when the relative position of the connection lines changes, it is generally necessary to redesign and verify the connection points of the housing;

if some parts of the PCB board are damaged, the entire PCB board needs to be replaced, which is costly and poorly adaptable.

Disclosure of Invention

The present application has been made in view of the state of the art described above. An object of the application is to provide a filter equipment and motor for motor.

Provided is a filter device for a motor, including:

a flexible circuit board having a filter circuit and a ground layer, the ground layer being wound in a cylindrical shape, the filter circuit being located on an inner surface side and/or an outer surface side of the ground layer;

an insulating tube in which the flexible circuit board is wound in a cylindrical shape and housed;

a first connection line connected to the filter circuit and used for connecting the filter circuit to a device to be filtered;

a second connection line connected to the filter circuit and for connecting the filter circuit to a control unit; and

and the encapsulating material is positioned in the insulating tube and at least enables the filter circuit to be insulated and sealed.

In at least one embodiment, the first and second connection lines are soldered to the flexible circuit board, and the solder joints are encapsulated by the potting material.

In at least one embodiment, the potting material is a thermally conductive potting adhesive.

In at least one embodiment, the filter device for a motor further includes a negative temperature coefficient sensor as the device to be filtered, the negative temperature coefficient sensor being electrically connected to the first connection line and received in the insulating tube, the negative temperature coefficient sensor being covered with the potting material.

In at least one embodiment, the filtering device for a motor further comprises:

the first plug connector is electrically connected with the first connecting wire and is used for being in plug connection with the plug connector of the device to be filtered; and/or

And the second plug connector is electrically connected with the second connecting wire and is used for being in plug connection with the plug connector of the control unit.

In at least one embodiment, at least a portion of the first and/or second plug connector is received in the insulating tube.

In at least one embodiment, the device to be filtered is a negative temperature coefficient sensor or a rotary transformer, and the control unit is a motor control unit.

In at least one embodiment, the filter circuit includes a surface mount device including a resistor, a capacitor, and an inductor.

A motor is also provided, which comprises a filter device for a motor according to the present application.

In at least one embodiment, the motor filter is mounted to the motor housing of the motor by a band or snap fit.

So, this application provides a simple structure, small, the high filter for motor of reliability and includes this filter for motor's motor.

Drawings

Fig. 1 shows a schematic structural view of a filter device for a motor according to an embodiment of the present application.

Fig. 2 shows a schematic view of the flexible printed circuit of the filter device for a motor in fig. 1.

Fig. 3 shows a schematic cross-sectional view of the filter device for the motor in fig. 1.

Fig. 4 shows a schematic structural view of a filter device for a motor according to another embodiment of the present application.

Fig. 5 shows a schematic illustration of the development of the filter device for the motor in fig. 4.

Fig. 6A shows a schematic illustration of a first plug connector of the filter device for a motor in fig. 4.

Fig. 6B shows a schematic illustration of the second plug connector of the filter device for a motor in fig. 4.

Description of the reference numerals

10 flexible circuit board

11 filter circuit

111 capacitor

112 inductance

12 ground plane

20 insulating tube

30 first connecting line

40 second connecting line

50 device to be filtered

60 potting Material

70 first plug-in connector

80 second plug-in connector

Detailed Description

Exemplary embodiments of the present application are described below with reference to the accompanying drawings. It should be understood that the detailed description is only intended to teach one skilled in the art how to practice the present application, and is not intended to be exhaustive or to limit the scope of the application.

Referring to fig. 1 to 6B, the present application provides a filter device for a motor, which includes a flexible circuit board 10, an insulating tube 20, a first connection line 30, a second connection line 40, and a potting material 60.

The flexible circuit board 10 has a filter circuit 11 and a ground layer 12, the ground layer 12 is wound in a cylindrical shape, and the filter circuit 11 is located on the inner surface side and/or the outer surface side of the ground layer 12. The flexible circuit board 10 is wound in a cylindrical shape and is accommodated in the insulating tube 20. The first connection line 30 is connected to the filter circuit 11 and is used to connect the filter circuit 11 to the device to be filtered 50. The second connection line 40 is connected to the filter circuit 11 and serves to connect the filter circuit 11 to the control unit. The potting material 60 is located in the insulating tube 20, and at least the filter circuit 11 is hermetically sealed.

Therefore, the filtering device for the motor is simple in structure and convenient to arrange. The shape of the ground plane 12 is cylindrical, which will increase the interference rejection capability of the filter circuit 11.

Preferably, the potting material 60 fills the insulating tubing 20. The interior of the insulating tube 20 is filled with a potting material 60, which will increase the strength and durability of the filter device for the entire motor.

Alternatively, the first and second connection lines 30 and 40 may be soldered to the flexible circuit board 10, and the soldering points are covered with the potting material 60. The solder connection is inexpensive, and the solder joint is embedded in the potting material 60, which can improve reliability, for example, the occurrence of poor connection due to vibration is not likely.

Of course, the present application is not limited thereto, for example, the first connection line 30 and/or the second connection line 40 may also be plug-connected with a corresponding interface on the flexible circuit board 10.

Preferably, the potting material 60 may be an electrically insulating, thermally conductive potting compound, in particular a highly thermally conductive potting compound. The heat-conducting pouring sealant can enhance the shock resistance, the waterproof capability and the heat dissipation performance of the product. The stability of the working environment of the product is protected, and the service life is prolonged. As examples, a polyurethane heat conductive potting adhesive, an epoxy heat conductive potting adhesive, a silicone heat conductive potting adhesive, and the like can be used.

As shown in fig. 1, in an alternative embodiment, the filter device for a motor may further include a negative temperature coefficient sensor as the device to be filtered 50, which is electrically connected to the first connection line 30 and is received in the insulating tube 20. The negative temperature coefficient sensor may be encapsulated by a potting material 60. Here, a negative temperature coefficient sensor may be used to measure the temperature of the motor windings.

As shown in fig. 4 and 5, in an alternative embodiment, the filter device for a motor may further comprise a first plug connector 70, the first plug connector 70 being electrically connected to the first connecting line 30 for plug connection to a plug connector of the device to be filtered. Here, the device to be filtered may have a plug connector itself, or a plug connector may be provided on the connection line of the device to be filtered.

As shown in fig. 4 and 5, in an alternative embodiment, the filter device for a motor may further include a second plug connector 80, the second plug connector 80 being electrically connected to the second connecting line 40 for plug connection with the plug connector of the control unit. Here, the control unit itself can have a plug connection, or the control unit can have a plug connection on its connecting line.

Here, the first plug connector 70 and/or the second plug connector 80 may be a male connector or a female connector.

Preferably, at least a portion of the first and/or second plug connectors 70, 80 is received in the insulating tube 20. The dashed lines in fig. 4 illustrate the insulating tube 20, wherein a portion of the first plug connector 70 and a portion of the second plug connector 80 are received in the insulating tube 20 and adhesively secured to the insulating tube 20 via a thermally conductive potting compound. Preferably, the first plug connector 70 and/or the second plug connector 80 are waterproof plug connectors.

In this embodiment, the means to be filtered may be selected as desired. Alternatively, the device to be filtered here may be a negative temperature coefficient sensor or a resolver. Alternatively, the control unit here may be a motor control unit. Of course, the present application is not limited thereto, and for example, the device to be filtered may also be other devices or means.

Alternatively, the filter circuit 11 may include a surface mount device (SMD structure), which may include a resistor, a capacitor 111, and an inductor 112. The resistor, the capacitor 111 and the inductor 112 are surface mount devices and are soldered on the flexible circuit board 10, which helps to reduce the volume and facilitate the mounting.

A filter device for a motor according to an embodiment of the present application will be described in further detail with reference to fig. 1 to 3.

As described above, this embodiment of the present application provides a novel filter device for a motor, which may improve EMC performance, and may include an NTC sensor and a filter circuit. Therefore, the motor filter in this embodiment may also be referred to as an NTC sensor (i.e., an NTC sensor having a filter function).

As shown in fig. 1 and 2, the filter device for the motor may be represented as a cylindrical line and includes a general NTC sensor, a flexible circuit board 10 with a resistor, a capacitor 111, and an inductor 112, an insulating paste as a potting material 60, an insulating tube 20, 2 lead-out wires as first connection wires 30, and 3 lead-out wires as second connection wires 40. The 2 outgoing lines as the first connection lines 30 are connected to two outputs of the NTC sensor. The 3 lead lines as the second connection line 40 include a positive line, a negative line, and a Ground (GND) line. The 3 outgoing lines may be connected to the motor control unit via a low voltage plug connector.

The flexible circuit board 10 is made into a cylindrical shape by insulating paste and an insulating tube 20, and if the flexible circuit board 10 is cut in an axial direction (left-right direction in fig. 1 and 2) and extended into a flat plate shape, or in the flexible circuit board 10 before being wound into a cylindrical shape, a capacitor 111, an inductor 112, and a resistor can be seen.

Referring to fig. 3, in the illustrated example, the flexible circuit board 10 has 3 layers, the middle layer is a ground layer 12, and the other layers (i.e., the layer inside the middle layer and the layer outside the middle layer) may include circuit lines for connecting capacitors, inductors, resistors, and pinouts. It is to be understood that the present application is not limited to the above, and the flexible circuit board 10 may also have a two-layer or more structure, and the electrical components may be arranged on each layer outside the ground layer.

The flexible circuit board 10 and the NTC sensor have an insulating tube 20 on the outside thereof, which increases the insulating performance of the filter device for a motor, and the insulating tube 20 is filled with a potting material 60, which increases the strength, durability, and reliability of the filter device for a motor.

The flexible circuit board 10 is printed with a plurality of circuit lines, and then the resistors, the capacitors, the inductors and the outgoing lines are connected with the flexible circuit board 10 in a welding manner, so that the filtering function is achieved.

The filter device for a motor may be manufactured in the following manner.

(A) Manufacturing a flat flexible circuit board 10;

(B) soldering the first connection line 30, the second connection line 40 on the flexible circuit board 10, and connecting the first connection line 30 with a device to be filtered 50 such as an NTC sensor;

(C) the flexible circuit board 10 is curled into a cylindrical shape, and the flexible circuit board 10 and the device to be filtered 50 are placed into the insulating tube 20;

(D) the insulating tube 20 is filled with a heat-conducting potting adhesive.

In this way, the filter device for the motor forms a cylindrical line with a temperature measuring function and a filtering function.

In the filter device for the motor of the present embodiment, the NTC sensor is integrated with the flexible circuit board 10, and the filter device for the motor is a simple cylindrical circuit, and has a small volume and a simple structure.

The application also provides a motor, and it includes filter equipment for the motor according to the application.

The filter device for the motor is easy to fix, bolts are not used, and a large space is not needed for arrangement.

Alternatively, the motor filter device may be mounted to the motor housing of the motor by a band or snap fit.

The motor or the filter device for the motor of the present embodiment may be applied to an electric bridge or an electric vehicle (including a pure electric vehicle and a hybrid vehicle) including a motor that includes a temperature measuring function and a filtering function, which will improve the EMC performance of the electric bridge and the vehicle.

A filter device for a motor according to another embodiment of the present application will be described in further detail with reference to fig. 4 to 6B.

The main difference between this embodiment and the embodiment shown in fig. 1 to 3 is that a first plug connector 70 and a second plug connector 80 are connected to both ends of the flexible circuit board 10, respectively. The same reference numerals are given to components having the same or similar structure or function as those of the embodiment shown in fig. 1 to 3, and detailed descriptions of the components are omitted.

In the present embodiment, the first connection line 30 electrically connects the flexible circuit board 10 and the first plug connector 70. The first connection line 30 may include a positive line and a negative line, and the first plug connector 70 may include two pins (pins) connected to the positive line and the negative line of the first connection line 30, respectively. Two pins may be used to connect the sine and cosine outputs of the NTC sensor or resolver, respectively.

It is to be understood that the filtering device for a motor of the present embodiment is not limited to the filtering for the NTC sensor or the resolver, but may be used for any product requiring filtering, for example, having positive and negative output lines. In other words, the present application provides a filter device for a universal motor.

The generic motor filter device can be used for different products, which means that the costs can be further distributed.

The second connection line 40 electrically connects the flexible circuit board 10 and the second plug connector 80. The second connection line 40 may include a positive line, a negative line, and a ground line, and the second plug connector 80 may include three pins connected to the positive line, the negative line, and the ground line of the second connection line 40, respectively. The second plug-in connector 80 can be used for connecting a motor control unit.

A portion of the first plug connector 70 and a portion of the second plug connector 80 may be inserted into both ends of the insulating tube 20. Thus, the two connectors and the circuit board, i.e. the entire motor filter, form a cylindrical line. The filtering device for the motor is of a short-line structure, small in size and simple in structure.

It will be appreciated that in some aspects, multiple filtering channels may be provided on a single circuit board, such that the circuit board may be connected to multiple devices to be filtered.

In one example of the application, a filter device for a motor, or a flexible printed circuit board 10, can have only one filter channel. In this way, the motor filter device can be flexibly placed. Compared with a solution in which one circuit board comprises a plurality of filter channels, the arrangement of such a filter device for a motor is more flexible and simpler, and one or more filters for a motor can be arranged according to one or more devices to be filtered, such as NTC sensors or rotary transformers. When the filtering device for the motor is damaged, only the filtering device for the motor needs to be replaced, the filtering device (such as a PCB) comprising a plurality of filtering channels and having higher cost does not need to be replaced, and the maintenance and replacement cost is lower.

It should be understood that the above embodiments are merely exemplary, and are not intended to limit the present application. Various modifications and alterations of the above-described embodiments may be made by those skilled in the art in light of the teachings of this application without departing from the scope thereof.