Motor control apparatus, electrical power steering device, and vehicle

Abstract

This motor control apparatus comprises: an electrical motor; and a control device. The control device has a conductive motor case, an electronic circuit board, a connector, and a conductive cover. The electronic circuit board has a motor drive circuit and a motor control circuit. The connector has a power supply fitting part and a signal fitting part. At least one opening part into which the power supply fitting part and the signal fitting part can be inserted is provided to the cover. A first waterproof member is provided between the motor case and the cover. A second waterproof member is provided between the connector and a part of the cover surrounding the opening part. The electronic circuit board and the connector are arranged in a sealed space defined by the cover, the first waterproof member, the second waterproof member, and the motor case.

Description

Motor control device, electric power steering device, and vehicle

[0001] The present disclosure relates to a motor control device, an electric power steering device, and a vehicle.

[0002] Electric power steering devices installed in vehicles such as automobiles include a motor control device that integrates an electric motor that assists steering of the steering wheel and a controller that controls the electric motor. This motor control device includes a circuit board on which electrical components for driving and controlling the motor are mounted, an input / output connector for inputting and outputting power and signals from external devices, and a motor case and cover that house the electric motor and circuit board. The electric motor has windings, motor terminals for passing current through the windings, and a rotor that rotates when current flows through the windings.

[0003] Automobiles are equipped with a variety of electronic devices in addition to propulsion systems such as engines. In order to make automobiles lighter and smaller, miniaturization of each electronic device is required. Electric power steering devices are also required to be miniaturized, but miniaturization of motor control devices requires miniaturization of the housing and higher density of components mounted on the board.

[0004] Conventionally, an electric motor control device (Patent Document 1) is known in which, in order to miniaturize the motor control device, the mating portion of the external connector is exposed on the side opposite the electric motor, and the external connector is moved closer to the center of the electric motor and electric motor control device.

[0005] Japanese Patent Publication No. 2017-158223

[0006] Motor control devices are used in electric power steering devices mounted on vehicles such as automobiles. Vehicles are exposed to rain, snow, car washes, and other environmental factors. Therefore, when a motor control device is mounted in the engine compartment, water from these environments may enter the motor control device and cause a short circuit. Therefore, motor control devices are required to have waterproofing capabilities to prevent water from entering the motor control device.

[0007] One known method for providing waterproofing to motor control devices is to use waterproofing members, as described in Patent Document 1. To ensure sufficient adhesive strength to prevent the waterproofing members from peeling off due to temperature cycles or vibration, it is necessary to provide a sufficient adhesive margin to increase the adhesive area of ​​the waterproofing members. However, the connector fittings in Patent Document 1 are arranged in a single row at the edge of the control board. Therefore, providing a sufficient adhesive margin poses a problem: the dimensions of the motor control device increase in the direction perpendicular to the motor shaft. Because a vehicle contains numerous devices and wiring, the dimensions of the motor control device are strictly specified at the time of development (hereinafter, the dimensions of the motor control device specified at the time of development are referred to as the dimensional specifications).

[0008] The present disclosure has been made in consideration of these circumstances, and aims to solve the problem of providing a motor control device with waterproof functionality while satisfying dimensional regulations for the motor control device in a motor control device, an electric power steering device, and a vehicle.

[0009] In order to solve the above problems, a first aspect of the present disclosure provides an electric motor, and a control device integrated with the electric motor that controls driving of the electric motor, the control device having a conductive motor case, an electronic circuit board, a connector, and a conductive cover, the motor case having an attachment portion that fixes the motor case to the electronic circuit board and the connector, the electronic circuit board having a motor drive circuit mounted with a plurality of semiconductor switching elements that control current of the electric motor, and a motor control circuit mounted with a microcomputer that generates drive signals for driving the semiconductor switching elements, the connector being electrically connected to an external device and having a power supply fitting portion and a signal fitting portion that fit with the external device, a bar attached to the motor case so as to cover the electronic circuit board, the power supply fitting portion and the signal fitting portion being individually provided at different positions on the connector, the cover having at least one opening through which the power supply fitting portion and the signal fitting portion can be inserted, a first waterproofing member being provided between the motor case and the cover, and a second waterproofing member being provided between a portion of the cover surrounding the opening and the connector, and with the cover attached to the motor case via the first waterproofing member and the second waterproofing member, the electronic circuit board and the connector are arranged within an enclosed space defined by the cover, the first waterproofing member, the second waterproofing member, and the motor case.

[0010] In order to solve the above problem, a second aspect of the present disclosure is an electric power steering device including the motor control device according to the first aspect.

[0011] In order to solve the above problem, a third aspect of the present disclosure is a vehicle comprising a wheel and the electric power steering device described in the second aspect, wherein the motor control device of the electric power steering device is arranged in the vicinity of the wheel.

[0012] In the motor control device, electric power steering device, and vehicle according to the present disclosure, the connector fitting portion is divided into a power fitting portion and a signal fitting portion, allowing for flexibility in the arrangement of the connector fitting portion. This allows for a margin to be provided between the portion of the cover surrounding the opening and the connector to ensure the adhesive strength of the waterproofing member, allowing the motor control device to have waterproof functionality while satisfying dimensional regulations for the motor control device.

[0013] FIG. 1 is an exploded perspective view showing a motor control device according to a first embodiment of the present disclosure. FIG. 2 is an assembly view showing a motor control device according to a second embodiment of the present disclosure. FIG. 3 is an assembly view showing a motor control device according to a third embodiment of the present disclosure. FIG. 4 is an assembly view showing a motor control device according to a fourth embodiment of the present disclosure. FIG. 5 is an exploded perspective view showing a motor control device according to a fifth embodiment of the present disclosure. FIG. 6 is an exploded perspective view showing a motor control device according to a sixth embodiment of the present disclosure. FIG. 7 is an exploded perspective view showing a motor control device according to a seventh embodiment of the present disclosure. FIG. 8 is an external view showing motor control devices according to the first to seventh embodiments of the present disclosure.

[0014] Hereinafter, each embodiment of the present disclosure will be described with reference to the drawings. Note that the same reference numerals in the drawings indicate the same or equivalent parts and components.

[0015] (First Embodiment) Fig. 1 is an exploded perspective view showing a motor control device 24 according to a first embodiment of the present disclosure. Fig. 8 is an external view showing the motor control device 24 according to the first embodiment. In Fig. 1, the motor control device 24 includes an electric motor 1 and a control device 25 that controls the driving of the electric motor 1. The electric motor 1 and the control device 25 are integrated together. The control device 25 is disposed adjacent to the electric motor 1 in the direction in which the rotation axis O of the electric motor 1 extends. Hereinafter, the direction in which the rotation axis O of the electric motor 1 extends will be referred to as the axial direction O.

[0016] The control device 25 includes a conductive motor case 2, an electronic circuit board 5, a connector 6, and a conductive cover 9. The conductive motor case 2, the electronic circuit board 5, the connector 6, and the cover 9 are arranged side by side in the stated order in the axial direction O toward the side away from the electric motor 1.

[0017] The motor case 2 is formed in a plate shape and is formed in a rectangular shape when viewed from the axial direction O. The motor case 2 is adjacent to the electric motor 1 in the axial direction O. When the motor case 2 is viewed from the axial direction O, a notch is formed around the entire periphery of the outer periphery of the motor case 2 on the edge farthest from the electric motor 1. Furthermore, a first waterproofing member 11A is provided inside the notch around the entire periphery. The first waterproofing member 11A is made of a material with waterproof properties. An example of a material with waterproof properties is rubber.

[0018] The electronic circuit board 5 is formed in a plate shape and is formed in a rectangular shape when viewed from the axial direction O. The electronic circuit board 5 includes a motor drive circuit 3 and a motor control circuit 4 that are arranged on a surface facing the connector 6.

[0019] The connector 6 is formed in a rectangular shape when viewed from the axial direction O. The connector 6 includes a power supply fitting portion 7 and a signal fitting portion 8. The connector 6 has a plate-shaped base, and the power supply fitting portion 7 and the signal fitting portion 8 stand upright from the surface of the base that faces the cover 9. The power supply fitting portion 7 and the signal fitting portion 8 are individually provided at different positions on the connector 6.

[0020] The second waterproofing member 11B is provided on the surface of the connector 6 facing the cover 9 so as to surround the power supply fitting portion 7 and the signal fitting portion 8. The second waterproofing member 11B is made of a material that has a waterproof function. The material of the second waterproofing member 11B may be the same as or different from that of the first waterproofing member 11A.

[0021] The cover 9 is attached to the motor case 2 via the first waterproofing member 11A and the second waterproofing member 11B. In this state, the electronic circuit board 5 and the connector 6 are disposed in the sealed space defined by the motor case 2, the cover 9, the first waterproofing member 11A, and the second waterproofing member 11B.

[0022] The cover 9 is attached to the motor case 2 so as to cover the electronic circuit board 5. The cover 9 includes a plate-like member and a peripheral wall extending from the entire periphery of the plate-like member in a direction approaching the electric motor 1 in the axial direction O. The cover 9 is formed in a rectangular shape when viewed from the axial direction O. The cover 9 has at least one opening 10 through which the power supply fitting 7 and the signal fitting 8 can be inserted. In this embodiment, two openings 10 are provided in the cover 9, and the power supply fitting 7 and the signal fitting 8 are inserted into each of the two openings 10. However, the power supply fitting 7 and the signal fitting 8 may be inserted into one opening 10.

[0023] The motor case 2 and the cover 9 are formed into rectangular shapes of approximately the same shape and dimensions when viewed from the axial direction O. The electronic circuit board 5 and the connector 6 are formed into rectangular shapes of smaller dimensions than the motor case 2 and the cover 9 when viewed from the axial direction O.

[0024] The connector 6 has four connector through holes 19A that penetrate the base in the axial direction O. The four connector through holes 19A are arranged near each corner of the base of the connector 6. The electronic circuit board 5 has four board through holes 19B that penetrate the electronic circuit board 5 in the axial direction O. The four board through holes 19B are arranged near each corner of the electronic circuit board 5.

[0025] The motor case 2 includes a plurality of mounting portions 26. Each mounting portion 26 has a screw hole 18. In this embodiment, the mounting portions 26 are cylindrical, with the screw holes 18 formed on their upper surfaces. When viewed from the axial direction O, the mounting portions 26 are disposed at positions corresponding to the connector through-holes 19A of the connector 6 and the board through-holes 19B of the electronic circuit board 5. The connector 6 and the electronic circuit board 5 are fixed to the motor case 2 by a plurality of screws 12 passing through the connector through-holes 19A and the board through-holes 19B and threading into the screw holes 18.

[0026] The electronic circuit board 5 includes a motor drive circuit 3 and a motor control circuit 4. The motor drive circuit 3 is equipped with a plurality of semiconductor switching elements that control the current of the electric motor 1. The motor control circuit 4 is equipped with a microcomputer that generates drive signals for driving the semiconductor switching elements.

[0027] As described above, the motor control device 24 according to the first embodiment includes the electric motor 1 and a control device 25 integrated with the electric motor 1 that controls the drive of the electric motor 1. The control device 25 includes a conductive motor case 2, an electronic circuit board 5, a connector 6, and a conductive cover 9. The motor case 2 has a mounting portion 26 that secures the motor case 2 to the electronic circuit board 5 and the connector 6. The electronic circuit board 5 includes a motor drive circuit 3 that is equipped with multiple semiconductor switching elements that control the current of the electric motor 1, and a motor control circuit 4 that is equipped with a microcomputer that generates drive signals for driving the semiconductor switching elements. The connector 6 electrically connects to an external device and has a power supply fitting portion 7 and a signal fitting portion 8 that fit with the external device. The cover 9 is attached to the motor case 2 so as to cover the electronic circuit board 5. The power supply fitting portion 7 and the signal fitting portion 8 are individually provided at different positions on the connector 6. The cover 9 is provided with at least one opening 10 through which the power supply fitting portion 7 and the signal fitting portion 8 can be inserted. A first waterproofing member 11A is provided between the motor case 2 and the cover 9. A second waterproofing member 11B is provided between the portion of the cover 9 surrounding the opening 10 and the connector 6. With the cover 9 attached to the motor case 2 via the first waterproofing member 11A and the second waterproofing member 11B, the electronic circuit board 5 and the connector 6 are disposed in the sealed space defined by the cover 9, the first waterproofing member 11A, the second waterproofing member 11B, and the motor case 2.

[0028] This configuration allows for greater flexibility in the placement of the power fitting portion 7 and the signal fitting portion 8 of the connector 6. This alleviates dimensional restrictions on the control device 25, enabling a design that flexibly accommodates restrictions on the placement of the control device 25 within the vehicle. Furthermore, by placing waterproof members 11A, 11B between the connector 6 and the cover 9, it is possible to provide the motor control device 24 with a high level of waterproofing capability.

[0029] Second Embodiment Fig. 2 is an assembly diagram showing a motor control device 24 according to a second embodiment of the present disclosure. Fig. 8 is an external view showing the motor control device 24 according to the second embodiment. The basic structure of the motor control device 24 according to the second embodiment is similar to that of the first embodiment, so the following description will focus on the differences. Compared to the motor control device 24 according to the first embodiment, the present embodiment further includes the following structure.

[0030] 2, the control device 25 according to this embodiment includes a shielding material 13 that shields electromagnetic waves. The shielding material 13 has a plurality of crimping holes 15. The connector 6 includes a plurality of crimping protrusions 14. The crimping protrusions 14 are provided on the surface of the base of the connector 6 that faces the electronic circuit board 5. The crimping protrusions 14 are inserted into the crimping holes 15 and are thereby thermally crimped, thereby fixing the shielding material 13 to the connector 6.

[0031] The shielding material 13 is formed in a plate shape and is formed in a rectangular shape when viewed from the axial direction O. The shielding material 13 is provided between the electronic circuit board 5 and the connector 6 in the axial direction O. When viewed from the axial direction O, the crimping holes 15 are arranged near each corner of the shielding material 13. The crimping holes 15 penetrate the shielding material 13 in the axial direction O.

[0032] As described above, in the motor control device 24 of the second embodiment, the control device 25 has a shielding material 13 that shields electromagnetic waves. The shielding material 13 has a crimping hole 15 formed therein. The connector 6 is provided on a surface facing the electronic circuit board 5 and has a crimping protrusion 14 inserted into the crimping hole 15. The crimping hole 15 and the crimping protrusion 14 are fixed together by thermal crimping. This configuration can prevent electromagnetic waves generated by the motor control device 24 from passing through the opening 10 in the cover 9 and radiating to the outside. It can also prevent electromagnetic waves from passing through the opening 10 in the cover 9 and causing malfunction of the electronic circuit. In other words, electromagnetic waves are shielded by the shielding material 13, suppressing radiative and conductive electromagnetic interference and noise interference in in-vehicle radios, audio equipment, and the like.

[0033] Third Embodiment Fig. 3 is an assembly diagram showing a motor control device 24 according to a third embodiment of the present disclosure. Fig. 8 is an external view showing the motor control device 24 according to the third embodiment. The basic structure of the motor control device 24 according to the third embodiment is similar to that of the first embodiment, and therefore differences will be mainly described. Compared with the motor control device 24 according to the first embodiment, the present embodiment further includes the following structure.

[0034] As shown in Fig. 3, the control device 25 according to the third embodiment includes a shielding material 13 that shields electromagnetic waves. The shielding material 13 is formed in a plate shape and is rectangular when viewed from the axial direction O. The shielding material 13 is provided between the electronic circuit board 5 and the connector 6 in the axial direction O. The shielding material 13 has at least one snap-fit ​​hole 17. In the third embodiment, the shielding material 13 has two snap-fit ​​holes 17. The snap-fit ​​holes 17 penetrate two wall portions that protrude toward the connector 6 from two of the four parallel sides of the shielding material 13.

[0035] The connector 6 has the same number of snap-fit ​​protrusions 16 as the number of snap-fit ​​holes 17. One snap-fit ​​protrusion 16 is disposed near one of the four sides of the base of the connector 6. More specifically, the snap-fit ​​protrusion 16 is located inside a recess formed in the base of the connector 6, and protrudes laterally (in a direction perpendicular to the axial direction O).

[0036] The shielding material 13 is fixed to the connector 6 by the snap-fit ​​protrusions 16 that are fitted into and hooked onto the snap-fit ​​holes 17 .

[0037] As described above, in the motor control device 24 of embodiment 3, the control device 25 has the shielding material 13 that shields electromagnetic waves, and the shielding material 13 has snap-fit ​​holes 17 formed therein. The connector 6 has the snap-fit ​​protrusions 16. The snap-fit ​​protrusions 16 are fitted into the snap-fit ​​holes 17 and hooked into the snap-fit ​​holes 17, thereby fixing the shielding material 13 to the connector 6. This configuration makes it possible to easily fix the shielding material 13 and the connector 6 together. This has the advantage that no equipment is required for, for example, thermal caulking.

[0038] (Fourth embodiment) Fig. 4 is an assembly diagram showing a motor control device 24 according to a fourth embodiment of the present disclosure. Fig. 8 is an external view showing the motor control device 24 according to the fourth embodiment. The basic structure of the motor control device 24 according to the fourth embodiment is similar to that of the first embodiment, so the following description will focus on the differences. Compared with the motor control device 24 according to the first embodiment, the fourth embodiment further includes the following structure.

[0039] 4, a control device 25 according to this embodiment includes a shielding material 13 that blocks electromagnetic waves. The shielding material 13 has a plurality of shield through-holes 19C. The shield through-holes 19C are disposed near each corner of the shielding material 13 and penetrate the shielding material 13 in the axial direction O.

[0040] The connector 6 has a plurality of screw holes 18. The screw holes 18 are provided on the surface of the base of the connector 6 that faces the electronic circuit board 5. A plurality of screws 12 pass through the shield through-holes 19C and are screwed into the screw holes 18. In this way, the shielding material 13 is fixed to the connector 6.

[0041] As described above, in the motor control device 24 of embodiment 4, the control device 24 includes the screws 12 and the shielding material 13 that shields electromagnetic waves. The shielding material 13 has the shield through-holes 19C formed therein. The connector 6 has the screw holes 18 formed on the surface facing the electronic circuit board 5. The screws 12 are inserted into the shield through-holes and threaded into the screw holes 18, thereby fixing the shielding material 13 to the connector 6. This configuration makes it possible to easily fix the shielding material 13 and the connector 6 together. In other words, this has the advantage that an existing mechanism for tightening screws can be used during assembly.

[0042] Fifth Embodiment Fig. 5 is an exploded perspective view showing a motor control device 24 according to a fifth embodiment of the present disclosure. Fig. 8 is an external view showing the motor control device 24 according to the fifth embodiment. The motor control device 24 according to the fifth embodiment further includes the following structure in addition to the motor control device 24 according to the second to fourth embodiments.

[0043] The control device 25 has screws 12. The shielding material 13 has shield through-holes 19C. The connector 6 has connector through-holes 19A. The motor case 2 has screw holes 18 provided on the surface facing the electronic circuit board 5. The connector 6 and the shielding material 13 are fastened together to the motor case 2 by screws 12 that pass through the connector through-holes 19A and the shield through-holes 19C and are threaded into the screw holes 18.

[0044] The motor control device 24 of embodiment 5 allows the energy of external noise and noise radio waves received by the shielding material 13 to flow to the motor case 2, and from the motor case 2 to be absorbed by the earth of the system (e.g., vehicle) in which the motor control device 24 is installed. This further enhances the effect described in embodiment 2, namely, the effect of suppressing radiated and conductive electromagnetic interference and suppressing noise interference in in-vehicle radios, audio equipment, etc.

[0045] Sixth Embodiment Fig. 6 is an exploded perspective view showing a motor control device 24 according to a sixth embodiment of the present disclosure. Fig. 8 is an external view showing the motor control device 24 according to the sixth embodiment. The motor control device 24 according to the sixth embodiment further includes the following structure in addition to the motor control device 24 according to the fifth embodiment.

[0046] The control device 25 includes a ground lead 20 and a ground wire 21. The ground lead 20 is provided on the connector 6 and can be electrically connected to the ground of an external device. The ground wire 21 is provided on the electronic circuit board 5 and electrically connected to the motor case 2. The ground lead 20 and the ground wire 21 are in contact with each other so as to be electrically conductive.

[0047] According to the motor control device 24 of the fifth embodiment, the energy of external noise and noise radio waves received by the shielding material 13 can be absorbed by the earth of the system (e.g., a vehicle) in which the motor control device 24 is installed, via the earth wiring 21 and the earth lead 20. As a result, even in a system (e.g., a vehicle) in which the motor case 2 is installed, in which the motor case 2 cannot be connected to the vehicle earth, the effect of the motor control device 24 of the fifth embodiment described above can be obtained, i.e., the effect of suppressing radiated and conducted electromagnetic interference and suppressing noise interference in in-vehicle radios, audio equipment, etc., via the earth lead 20.

[0048] Seventh Embodiment Fig. 7 is an exploded perspective view showing a motor control device 24 according to a seventh embodiment of the present disclosure. Fig. 8 is an external view showing the motor control device 24 according to the seventh embodiment. The motor control device 24 according to the seventh embodiment further includes the following structure in addition to the motor control devices 24 according to the first to sixth embodiments.

[0049] The control device 25 further includes a heat dissipation material 22 that is disposed between the motor drive circuit 3 and the cover 9 and dissipates heat generated by the motor drive circuit 3. The cover 9 includes a heat dissipation protrusion 23 that protrudes toward the electronic circuit board 5 and is in contact with the heat dissipation material 22.

[0050] The motor control device 24 of the seventh embodiment can transfer heat generated by the motor drive circuit 3 to the cover 9, and then from the cover 9 to the motor case 2. This makes it possible to lower the temperature of the motor drive circuit 3, and improve the performance (for example, the operable temperature and operating current) and lifespan of the motor control device 24.

[0051] Eighth Embodiment Next, an eighth embodiment relating to an electric power steering device and a vehicle will be described. The motor control device 24 according to the first to seventh embodiments of the present disclosure can be used in an electric power steering device mounted on a vehicle. The electric power steering device includes the motor control device 24 according to any one of the first to seventh embodiments. The vehicle includes wheels and an electric power steering device, and the motor control device 24 is disposed near the wheels.

[0052] Generally, when a motor control device is disposed near the wheels, as in a rack-assist electric power steering device, water is likely to seep into the motor control device from outside the vehicle. In contrast, according to the electric power steering device or vehicle of embodiment 8, the waterproof performance of the motor control device 24 of embodiments 1 to 7 makes it possible to prevent malfunctions caused by water seeping into the motor control device 24. Therefore, malfunctions in the electric power steering device and vehicle can be prevented.

[0053] The technical scope of the present disclosure is not limited to the above-described embodiments, and various modifications can be made without departing from the spirit of the present disclosure.

[0054] In addition, within the scope of the present disclosure, it is possible to replace the components in the above-described embodiments with well-known components as appropriate, and the above-described embodiments and variations may be combined as appropriate.

[0055] REFERENCE SIGNS LIST 1 electric motor 2 motor case 3 motor drive circuit 4 motor control circuit 5 electronic circuit board 6 connector 7 power supply fitting portion 8 signal fitting portion 9 cover 10 opening 11A first waterproof member 11B second waterproof member 12 screw 13 shielding material 14 crimped protrusion 15 crimped hole 16 snap-fit ​​protrusion 17 snap-fit ​​hole portion 18 screw hole 19A connector through-hole 19B board through-hole 19C shield through-hole 20 earth lead 21 earth wiring 22 heat dissipation material 23 heat dissipation protrusion 24 motor control device 25 control device 26 mounting portion

Claims

1. An electric motor comprising: an electric motor; and a control device integrated with the electric motor for controlling the drive of the electric motor, the control device having a conductive motor case, an electronic circuit board, a connector, and a conductive cover, the motor case having an attachment portion for fixing the motor case to the electronic circuit board and the connector, the electronic circuit board having: a motor drive circuit equipped with a plurality of semiconductor switching elements for controlling the current of the electric motor, and a motor control circuit equipped with a microcomputer for generating a drive signal for driving the semiconductor switching elements, the connector electrically connects to an external device and has a power supply fitting portion and a signal fitting portion for fitting with the external device, the cover is attached to the motor case so as to cover the electronic circuit board, the power supply fitting portion and the signal fitting portion are individually provided at different positions on the connector, at least one opening through which the power supply fitting portion and the signal fitting portion can be inserted is provided in the cover, and a first waterproofing member is provided between the motor case and the cover, a second waterproofing member is provided between the connector and a portion of the cover surrounding the opening, and the electronic circuit board and the connector are disposed within an enclosed space defined by the cover, the first waterproofing member, the second waterproofing member, and the motor case with the cover attached to the motor case via the first waterproofing member and the second waterproofing member.

2. A motor control device as described in claim 1, wherein the control device has a shielding material that blocks electromagnetic waves, the shielding material has a crimping hole formed therein, the connector is provided on a surface facing the electronic circuit board and has a crimping protrusion inserted into the crimping hole, and the crimping hole and the crimping protrusion are fixed by thermal crimping.

3. A motor control device as described in claim 1, wherein the control device has a shielding material that blocks electromagnetic waves, a snap-fit ​​hole portion is formed in the shielding material, and the connector has a snap-fit ​​protrusion, and the snap-fit ​​protrusion is fitted into the snap-fit ​​hole portion and hooked into the snap-fit ​​hole portion, thereby fixing the shielding material to the connector.

4. A motor control device as described in claim 1, wherein the control device has a screw and a shielding material that blocks electromagnetic waves, the shielding material has a shield through-hole formed therein, the connector has a screw hole provided on a surface facing the electronic circuit board, and the shielding material is fixed to the connector by the screw being inserted through the shield through-hole and screwed into the screw hole.

5. A motor control device as described in any one of claims 2 to 4, wherein the control device has a screw, the shielding material has a shield through-hole, the connector has a connector through-hole, and the motor case has a screw hole provided on a surface facing the electronic circuit board, and the screw passes through the shield through-hole and the connector through-hole and is screwed into the screw hole, thereby fastening the connector and the shielding material together to the motor case.

6. The motor control device according to claim 5, wherein the control device comprises: an earth lead provided in the connector and electrically connectable to the earth of the external device; and an earth wiring provided in the electronic circuit board and electrically connected to the motor case, the earth lead and the earth wiring being in contact with each other so as to have electrical conductivity.

7. A motor control device as claimed in any one of claims 1 to 6, wherein the control device has a heat dissipation material disposed between the motor drive circuit and the cover for dissipating heat generated by the motor drive circuit, and the cover has a heat dissipation protrusion that protrudes towards the electronic circuit board and comes into contact with the heat dissipation material.

8. An electric power steering device equipped with a motor control device according to any one of claims 1 to 7.

9. A vehicle comprising: a wheel; and an electric power steering device according to claim 8, wherein the motor control device of the electric power steering device is disposed in the vicinity of the wheel.

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