JP6601839B2 - Motor control device - Google Patents

Description

  The present invention relates to a motor control device.

  As this type of technique, a technique described in Patent Document 1 below is disclosed. Patent Document 1 discloses a motor rotation angle sensor including a sensor magnet provided on a yoke fixed to a motor shaft and a Hall element provided on a circuit board.

JP 2008-219996

However, in the technique of Patent Document 1, since the yoke and the sensor magnet, which are rotating bodies, are arranged at the positions facing the circuit board, there is a possibility that, for example, pieces of the yoke or sensor magnet, rust, etc. may be scattered on the circuit board side. It was.
The present invention has been focused on the above problems, and the object of the present invention is to provide a motor control device capable of suppressing scattered matter from the rotating body of the motor to the circuit board (power control unit). is there.

In order to achieve the above object, in the motor control device of the present invention, of the pair of end portions of the motor shaft, the motor control device is provided on the control board housing member side, and has N and S poles in the direction around the rotation axis of the motor shaft The rotation angle of the motor rotor that is provided so as to face the magnet in the housing and rotates integrally with the motor shaft by detecting the change in the magnitude or direction of the magnetic field of the magnet accompanying the rotation of the motor shaft. And a magnet cover that is formed of a nonmagnetic material and is provided on the motor element housing member side so as to surround the magnet with respect to the power control unit . The bus bar mold faces the power supply unit. As described above, the magnet cover is fixed to the motor element housing portion side and connected to the bus bar mold .

Therefore, the scattered matter from the rotating body of the motor to the power control unit can be suppressed , and the magnet cover can be assembled together with the bus bar mold, so that the assembly to the housing can be facilitated .

1 is a cross-sectional view of an electric power steering device of Example 1. FIG. FIG. 3 is an enlarged cross-sectional view of the vicinity of a motor rotation angle sensor according to the first embodiment. 1 is a perspective view of a motor housing of Example 1. FIG. FIG. 4 is an enlarged cross-sectional view of the vicinity of a motor rotation angle sensor according to a second embodiment. It is an expanded sectional view near the motor rotation angle sensor of other examples.

Example 1
[Configuration of power steering device]
FIG. 1 is a cross-sectional view of the electric power steering apparatus 1. The power steering apparatus 1 includes a steering mechanism 2 that transmits rotation of a steering wheel steered by a driver to a steered shaft 10 that steers steered wheels, and an assist mechanism 3 that applies assist force to the steered shaft 10. Have.
Each component of the power steering device 1 is accommodated in a housing 30 including a first housing 31, a second housing 32, a motor housing 33, a control unit housing 34, and a control unit cover 36.
The steering mechanism 2 has a steering input shaft 20 connected to the steering wheel. A pinion is formed at the tip of the steering input shaft 20. The pinion meshes with a rack formed on the outer periphery of the steered shaft 10.
The assist mechanism 3 includes a motor 40 and a ball screw mechanism 90 that transmits the output of the motor 40 to the steered shaft 10. The output of the motor 40 is controlled by the electronic control unit 60 in accordance with the steering torque and the steering amount input to the steering wheel by the driver.

The ball screw mechanism 90 includes a nut 91 and an output pulley 92. The appearance of the output pulley 92 is a cylindrical member, and is fixed to the nut 91 so as to be integrally rotatable. A cylindrical input pulley 93 is fixed to the motor shaft 41 of the motor 40 so as to rotate integrally. The rotation axis of the nut 91 is a first reference axis L1, and the rotation axis of the input pulley 93 is a second reference axis L2. The second reference axis L2 is arranged so as to be offset in the radial direction with respect to the first reference axis L1. The output pulley 92 fixed integrally with the nut 91 also has the first reference axis L1 as the rotation axis.
A belt 94 is wound between the input pulley 93 and the output pulley 92. The belt 94 is made of resin. The driving force of the motor 40 is transmitted to the nut 91 via the input pulley 93, the belt 94, and the output pulley 92. The outer diameter of the input pulley 93 is smaller than the outer diameter of the output pulley 92. The input pulley 93, the output pulley 92, and the belt 94 constitute a speed reducer.

The nut 91 is formed in a cylindrical shape so as to surround the steered shaft 10, and is provided so as to be rotatable with respect to the steered shaft 10. A groove is spirally formed on the inner periphery of the nut 91, and this groove forms a nut-side ball screw groove 95. A spiral groove is formed on the outer periphery of the turning shaft 10 at a position away from the portion where the rack is formed in the axial direction, and this groove constitutes the turning shaft side ball screw groove 11. .
With the nut 91 inserted into the steered shaft 10, the ball circulation groove 12 is formed by the nut side ball screw groove 95 and the steered shaft side ball screw groove 11. The ball circulation groove 12 is filled with a plurality of balls 96 made of metal. When the nut 91 rotates, the ball 96 moves in the ball circulation groove 12, so that the steered shaft 10 moves in the longitudinal direction with respect to the nut 91.

[Motor configuration]
The motor 40 has a motor shaft 41 rotatably supported in the motor housing 33, a motor rotor 42 that rotates integrally with the motor shaft 41, and a motor stator 43 that is fixed in the motor housing 33.
The motor housing 33 is formed in a bottomed cup shape. A bottom 33a is formed on the second housing 32 side of the motor housing 33. A shaft insertion hole 33b penetrating in the axial direction is formed near the center of the bottom 33a. The end of the motor shaft 41 on the second housing 32 side is inserted into the shaft insertion hole 33b and installed so as to reach the second housing 32. A bearing 80 is provided on the second housing 32 side of the bottom 33a, and the motor shaft 41 is rotatably supported by the bearing 80.
The opening on the control unit housing 34 side of the motor housing 33 is closed by a lid member 35. Near the center of the lid member 35, a shaft through hole 35a penetrating in the axial direction is formed. The end of the motor shaft 41 on the control unit housing 34 side is inserted into the shaft through hole 35a and installed so as to reach the control unit housing 34. A bearing 81 is provided on the control unit housing 34 side of the lid member 35, and the motor shaft 41 is rotatably supported by the bearing 81.

The motor 40 is provided with a motor rotation angle sensor 5, and the rotation angle of the motor rotor 42 is detected by the motor rotation angle sensor 5. The rotation angle of the motor rotor 42 detected by the motor rotation angle sensor 5 is sent to the electronic control unit 60. The electronic control unit 60 is mounted on the control board 63. The electronic control unit 60 controls the power supplied from the power supply unit 61 to the motor stator 43 based on the rotation angle of the motor rotor 42.
The power supply unit 61 is connected to the motor stator 43 via the bus bar 62. The bus bar 62 is supported by a bus bar mold 64. The bus bar mold 64 is disposed between the motor 40 and the control board 63 (electronic control unit 60). The bus bar mold 64 is fixed to the control unit housing 34 side of the lid member 35.

[Configuration of motor rotation angle sensor]
FIG. 2 is an enlarged cross-sectional view of the vicinity of the motor rotation angle sensor 5. FIG. 3 is a perspective view of the motor housing 33 with the control unit housing 34 removed and the members accommodated in the motor housing 33. FIG.
The motor rotation angle sensor 5 includes a magnet 50 provided at the tip of the motor shaft 41 of the motor 40 on the control unit housing 34 side, and a magnetic sensor 51 provided at a position facing the magnet 50 on the control board 63. Has been.
The magnetic sensor 51 detects a change in the magnetic field when the magnet 50 rotates together with the motor shaft 41 and outputs the change to the electronic control unit 60 as the rotation angle of the motor rotor 42 (motor rotation angle). The magnetic sensor 51 only needs to be on the control unit housing 34 side with respect to a magnet cover 71 described later, and the magnetic sensor 51 may be in the motor housing 33.
The end of the motor shaft 41 on the control unit housing 34 side passes through the shaft insertion hole 33 b of the motor housing 33 and is located in the control unit housing 34.

The magnet 50 is held via a magnet holder 52 at the tip of the motor shaft 41 (portion located in the control unit housing 34). The magnet holder 52 is injection-molded with a magnetic material such as iron. In the magnet holder 52, the magnet 50 is press-fitted and the tip of the motor shaft 41 is press-fitted.
The magnet 50 has N and S poles magnetized around the rotation axis of the motor shaft 41. The N pole and the S pole may be a pair or a plurality of pairs. The magnet 50 is provided with a press-fit portion extending from the vicinity of the center of the disk-shaped member, and this press-fit portion is press-fitted into the magnet holder 52. The magnet 50 is held by the magnet holder 52, and surfaces other than the surface facing the magnetic sensor 51 are surrounded by the magnet holder 52. Therefore, the magnet 50 shields the magnetic field from the outside (particularly from the bus bar 62) by the magnet holder 52.

[Composition of magnet cover]
The magnet holder 52 and the magnet 50 are located closer to the control board 63 than the bus bar mold 64. The radially outer sides of the magnet holder 52 and the magnet 50 are surrounded by a cylindrical cover 70 having a cylindrical shape. The cylindrical cover 70 is formed integrally with the bus bar mold 64 and is erected from the bus bar mold 64 on the control board 63 side. The inner diameter of the cylindrical cover 70 is formed larger than the inner diameter of the shaft insertion hole 33b. The opening on the control board 63 side of the cylindrical cover 70 is closed by a magnet cover 71. By the cylindrical cover 70 and the magnet cover 71, the space on the magnet holder 52 and the magnet 50 side is sealed with respect to the space on the control board 63 and the power supply unit 61 side.
The cylindrical cover 70, the magnet cover 71, and the bus bar mold 64 are integrally formed of a resin material. That is, the cylindrical cover 70 and the magnet cover 71 are made of a nonmagnetic and insulating material.

[Action]
The motor rotation angle sensor 5 needs to be arranged with the magnet 50 and the magnetic sensor 51 as close as possible. The magnet 50 and the magnet holder 52 to which the magnet 50 is attached rotate integrally with the motor shaft 41. Therefore, there is a possibility that fragments of the magnet 50 and the magnet holder 52 may be scattered on the control board 63 side. In particular, since the magnet holder 52 is made of iron, there is a high possibility that the rust will be scattered on the control board 63.
Since the motor shaft 41 and the magnet 50 are press-fitted into the magnet holder 52, iron, which is a low-cost material with sufficient strength, is often used. There is a possibility that water from the outside may enter the electric power steering apparatus 1, and iron may be rusted. In order to prevent rust, it is conceivable that the magnet holder 52 is plated or the like. However, when the magnet 50 or the motor shaft 41 is press-fitted into the magnet holder 52 or when the magnet 50 is magnetized, the magnet holder 52 is also hot. Therefore, the plating is easily peeled off and the generation of rust cannot be sufficiently prevented.

Therefore, in the first embodiment, the cylindrical cover 70 and the magnet cover 71 (magnet cover) are provided so as to surround the magnet 50 with respect to the control board 63 (power control unit). Thereby, it is possible to suppress the fragments and rust of the magnet 50 and the magnet holder 52 from being scattered on the control board 63. In addition, since the cylindrical cover 70 and the magnet cover 71 are made of a nonmagnetic material, it is possible to prevent foreign matter such as iron powder from adhering to the magnet 50 in the manufacturing process or the like.
In the first embodiment, the cylindrical cover 70 and the magnet cover 71 are made of an insulating material. In the case of a non-magnetic but conductive material such as aluminum or copper, an eddy current is generated due to a change in the magnetic field, which may reduce the detection accuracy of the motor rotation angle. By forming the cylindrical cover 70 and the magnet cover 71 from an insulating material, it is possible to suppress the generation of eddy currents and suppress a decrease in the detection accuracy of the motor rotation angle.
In Example 1, the cylindrical cover 70 and the magnet cover 71 are made of a resin material. Thereby, it is easy to make the cylindrical cover 70 and the magnet cover 71 thinner, and the magnet 50 and the magnetic sensor 51 can be brought closer to each other. Therefore, it is possible to suppress a decrease in the detection accuracy of the motor rotation angle.

In the first embodiment, the cylindrical cover 70 and the magnet cover 71 are connected to the bus bar mold 64. Thereby, since the cylindrical cover 70 and the magnet cover 71 can be assembled together with the bus bar mold 64, the assembly to the motor housing 33 can be facilitated.
In the first embodiment, the cylindrical cover 70 and the magnet cover 71 are integrally formed with the bus bar mold 64. As a result, the number of parts can be reduced and the productivity can be improved.
In Example 1, the cylindrical cover 70 and the magnet cover 71 are provided so as to surround only the magnet 50 and the magnet holder 52. Thereby, the cylindrical cover 70 and the magnet cover 71 can be downsized. Even when the cylindrical cover 70 and the magnet cover 71 are thinned, the rigidity of the cylindrical cover 70 and the magnet cover 71 can be maintained. Therefore, the magnet 50 and the magnetic sensor 51 can be brought close to each other, and a decrease in the detection accuracy of the motor rotation angle can be suppressed.
In the first embodiment, the cylindrical cover 70 and the magnet cover 71 are sealed with respect to the power supply unit 61. Thereby, it is possible to suppress the fragments and rust of the magnet 50 and the magnet holder 52 from being scattered on the control board 63.

[effect]
(1) A housing 30 having a motor housing 33 (motor element housing member) and a control unit housing 34 (control board housing member), a motor shaft 41 provided in the motor housing 33 and rotatably supported, and a motor shaft 41 A motor rotor 42 provided in the motor housing 33 so as to rotate integrally with the motor, a motor stator 43 provided in the motor housing 33 and driven to rotate by being energized, and provided on the control unit housing 34 side. The power supply 61 for supplying power to the motor stator 43 and the control shaft housing 34 of the pair of ends of the motor shaft 41 are arranged on the control housing 34 side. A motor shaft provided on the control unit housing 34 side so as to face the magnet 50 in the housing 30 and the magnet 50 in which the S pole is arranged. Provided on the control unit housing 34 side, a magnetic sensor 51 that detects the rotation angle of the motor rotor 42 that rotates integrally with the motor shaft 41 by detecting the change in the magnitude or direction of the magnetic field of the magnet 50 accompanying the rotation of 41. A control board 63 for controlling the power supplied from the power supply unit 61 to the motor stator 43 based on the rotation angle of the motor rotor 42, and a motor housing formed of a nonmagnetic material and surrounding the magnet 50 with respect to the control board 63 A cylindrical cover 70 and a magnet cover 71 (magnet cover) provided on the 33 side were provided.
Therefore, it is possible to suppress the fragments and rust of the magnet 50 and the magnet holder 52 from being scattered on the control board 63. In addition, since the cylindrical cover 70 and the magnet cover 71 are made of a nonmagnetic material, it is possible to prevent foreign matter such as iron powder from adhering to the magnet 50 in the manufacturing process or the like.

(2) The cylindrical cover 70 and the magnet cover 71 are made of an insulating material.
Therefore, generation | occurrence | production of an eddy current can be suppressed and the fall of the detection precision of a motor rotation angle can be suppressed.
(3) The cylindrical cover 70 and the magnet cover 71 are made of a resin material.
Thereby, it is easy to make the cylindrical cover 70 and the magnet cover 71 thinner, and the magnet 50 and the magnetic sensor 51 can be brought closer to each other. Therefore, it is possible to suppress a decrease in the detection accuracy of the motor rotation angle.
(4) A bus bar 62 that transmits electric power from the power supply unit 61 to the motor stator 43, and a bus bar mold 64 that is formed of a resin material and holds the bus bar 62. The bus bar mold 64 faces the power supply unit 61. Thus, the cylindrical cover 70 and the magnet cover 71 are fixed to the motor housing 33 side, and are connected to the bus bar mold 64.
Therefore, since the cylindrical cover 70 and the magnet cover 71 can be assembled together with the bus bar mold 64, the assembly to the motor housing 33 can be facilitated.
(5) The cylindrical cover 70 and the magnet cover 71 are integrally formed with the bus bar mold 64.
Therefore, the number of parts can be reduced, and manufacturability can be improved.

(6) The cylindrical cover 70 and the magnet cover 71 are provided so as to surround only the magnet 50 and the magnet holder 52.
Therefore, the cylindrical cover 70 and the magnet cover 71 can be reduced in size. Even when the cylindrical cover 70 and the magnet cover 71 are thinned, the rigidity of the cylindrical cover 70 and the magnet cover 71 can be maintained. Therefore, the magnet 50 and the magnetic sensor 51 can be brought close to each other, and a decrease in accuracy of detecting the motor rotation angle can be suppressed.
(7) The cylindrical cover 70 and the magnet cover 71 are sealed with respect to the power supply unit 61.
Therefore, it is possible to suppress the fragments and rust of the magnet 50 and the magnet holder 52 from being scattered on the control board 63.

(Example 2)
In the first embodiment, the bus bar mold 64, the cylindrical cover 70, and the magnet cover 71 are integrally formed of a resin material. In the second embodiment, the bus bar mold 64 and the cylindrical cover 70 are integrally formed, but the magnet cover 71 is formed separately, and after the bus bar molding 64 and the cylindrical cover 70 are attached to the motor housing 33, the magnet cover 71 is cylindrical. Hereinafter, the electric power steering apparatus 1 according to the second embodiment will be described. However, the same components as those of the first embodiment are denoted by the same reference numerals, and the description thereof is omitted.

[Composition of magnet cover]
FIG. 4 is an enlarged cross-sectional view in the vicinity of the motor rotation angle sensor 5. The magnet holder 52 and the magnet 50 are located closer to the control board 63 than the bus bar mold 64. The radially outer sides of the magnet holder 52 and the magnet 50 are surrounded by a cylindrical cover 70 having a cylindrical shape. The cylindrical cover 70 and the bus bar mold 64 are integrally formed of a thermoplastic resin material. The cylindrical cover 70 is erected from the bus bar mold 64 to the control board 63 side. The inner diameter of the cylindrical cover 70 is formed larger than the inner diameter of the shaft insertion hole 33b.
A cylindrical magnetic shield member 72 is provided on the outer peripheral side of the cylindrical cover 70. The height of the magnetic shield member 72 is substantially the same as or slightly lower than the height of the cylindrical cover 70. The magnetic shield member 72 is made of a magnetic material such as iron. The surface of the magnetic shield member 72 is plated. The magnetic shield member 72 shields the magnetic field from the outside (especially from the bus bar 62). For this reason, the magnet holder 52 may be formed of, for example, a resin material instead of a magnetic material such as iron.

  The opening on the control board 63 side of the cylindrical cover 70 is closed by a magnet cover 71. The magnet cover 71 is made of a thermoplastic resin. The magnet cover 71 is a disk-shaped member, and is formed so that its outer diameter is at least larger than the inner diameter of the magnetic shield member 72. The magnet cover 71 is fixed to the cylindrical cover 70 by ultrasonic welding. By the cylindrical cover 70 and the magnet cover 71, the space on the magnet holder 52 and the magnet 50 side is sealed with respect to the space on the control board 63 and the power supply unit 61 side. The magnet 50 is magnetized before the magnet cover 71 is attached.

[Action]
In Example 2, the magnet cover 71 is formed of a thermoplastic resin, and is joined to the cylindrical cover 70 provided on the motor housing 33 side and formed of the thermoplastic resin by ultrasonic welding. Compared with a snap fit or the like, rattling after the magnet cover 71 is assembled can be suppressed.
In the second embodiment, the magnet cover 71 is molded separately from the bus bar mold 64. Further, in Example 2, the magnet cover 71 is assembled after the magnet 50 is magnetized. When magnetizing the magnet 50, it is necessary to bring the magnetizing device as close as possible to the magnet 50. Therefore, it is not desired to provide a cover or the like on the side facing the magnet 50. In the second embodiment, since only the magnet cover 71 is assembled after the magnet 50 is magnetized, the magnet 50 can be magnetized efficiently. Further, since the bus bar molding and 64 can be assembled to the motor housing 33 and the magnet 50 can be magnetized while the bus bar 62 is energized, the phase of the motor 40 and the phase of the motor rotation angle sensor 5 can be matched.
In the second embodiment, the magnet cover 71 is provided with a magnetic shield member 72 (magnetic shield portion) made of a magnetic material provided on a portion other than the surface where the magnet 50 faces the magnetic sensor 51. Thereby, the magnetic field from the outside to the magnet 50 (especially from the bus bar 62) can be shielded. By providing the magnetic shield member 72, it is not necessary to form the magnet holder 52 with iron or the like, and the magnetic shield member 72 can also be plated, so that the occurrence of rust can be suppressed.

[effect]
(8) The magnet cover 71 is formed of a thermoplastic resin, and is joined to the cylindrical cover 70 provided on the motor housing 33 side and formed of the thermoplastic resin by ultrasonic welding.
Therefore, backlash after assembling of the magnet cover 71 can be suppressed as compared with a snap fit or the like.
(9) The magnet cover 71 was molded separately from the bus bar mold 64.
Therefore, since the bus bar molding and 64 can be assembled to the motor housing 33 and the magnet 50 can be magnetized while the bus bar 62 is energized, the phase of the motor 40 and the phase of the motor rotation angle sensor 5 can be matched. Further, the magnet 50 can be magnetized efficiently.
(10) The magnet cover 71 is assembled after the magnet 50 is magnetized.
Therefore, the magnet 50 can be magnetized efficiently.
(11) The magnet cover 71 is provided with a magnetic shielding member 72 (magnetic shielding portion) made of a magnetic material provided on a portion other than the surface where the magnet 50 faces the magnetic sensor 51.
Therefore, the magnetic field from the outside to the magnet 50 can be shielded.

[Other Examples]
As described above, the present invention has been described based on the first embodiment and the second embodiment. However, the specific configuration of each invention is not limited to the first and second embodiments and does not depart from the gist of the present invention. Such design changes are included in the present invention.
In the first and second embodiments, the space on the magnet holder 52 and the magnet 50 side is sealed from the space on the control board 63 and the power supply unit 61 side by the cylindrical cover 70 and the magnet cover 71. However, if the structure does not allow debris or rust to enter the space on the control board 63 and the power supply unit 61 side from the space on the magnet holder 52 and magnet 50 side, it does not need to be sealed.
FIG. 5 is an enlarged sectional view of the vicinity of the motor rotation angle sensor 5. For example, the magnet cover 71 may be formed of a waterproof and moisture permeable material.

[Technical thought other than claims]
Further, technical ideas other than the claims that can be grasped from the above-described embodiment will be described below.
(A) In the motor control device according to claim 5,
The motor control device according to claim 1, wherein the magnet cover is integrally formed with the bus bar mold.
(B) In the motor control device according to claim 1,
The motor control device according to claim 1, wherein the magnet cover includes a magnetic shielding portion formed of a magnetic material provided on a portion other than the surface where the magnet faces the magnetic sensor.
(C) In the motor control device according to claim 1,
The motor control device according to claim 1, wherein the magnet cover has a sealed structure with respect to the power supply unit.

30 Housing
33 Motor housing (motor element housing member)
34 Control unit housing (control board housing member)
41 Motor shaft
42 Motor stator
43 Motor rotor
50 magnet
51 Magnetic sensor
61 Power supply unit
62 Busbar
63 Control board
64 busbar mold
70 Cylindrical cover (Magnet cover)
71 Magnet cover
72 Magnetic shield (magnetic shield)

Claims (7)

A housing having a motor element housing member and a control board housing member;
A motor shaft provided in the motor element housing member and rotatably supported;
A motor rotor provided in the motor element housing member so as to rotate integrally with the motor shaft;
A motor stator that is provided in the motor element housing member and rotates the motor rotor when energized;
A power supply unit provided on the control board housing member side for supplying power to the motor stator;
A bus bar for transmitting power from the power supply unit to the motor stator;
A bus bar mold for holding the bus bar;
Of the pair of end portions of the motor shaft, a magnet provided on the control board housing member side and having a north pole and a south pole arranged in a direction around the rotation axis of the motor shaft;
It is provided on the control board housing member side so as to face the magnet in the housing, and is integrated with the motor shaft by detecting a change in the magnitude or direction of the magnetic field of the magnet accompanying the rotation of the motor shaft. A magnetic sensor for detecting a rotation angle of the rotating motor rotor;
A power control unit that is provided on the control board housing member side and controls power supplied from the power supply unit to the motor stator based on a rotation angle of the motor rotor;
A magnet cover formed of a non-magnetic material and provided on the motor element housing member side so as to surround the magnet with respect to the power control unit;
A motor control device comprising :
The bus bar mold is fixed to the motor element housing part side so as to face the power supply part,
The motor control device according to claim 1, wherein the magnet cover is connected to the bus bar mold . The motor control device according to claim 1,
The motor control device according to claim 1, wherein the magnet cover is formed of an insulating material. The motor control device according to claim 2,
The motor control device, wherein the magnet cover is formed of a resin material. The motor control device according to claim 3,
The motor control device according to claim 1, wherein the magnet cover is formed of a thermoplastic resin, and is joined to a member provided on the motor element housing member side and formed of the thermoplastic resin by ultrasonic welding. The motor control device according to claim 1,
The motor control device according to claim 1, wherein the magnet cover is formed separately from the bus bar mold. In the motor control device according to claim 1 ,
The magnet cover is a motor control device according to claim to provided we are able to surround only member connecting the magnet and the magnet on the motor shaft. In the motor control device according to claim 1,
The motor control device according to claim 1, wherein the magnet cover is assembled after the magnet is magnetized.

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