JP5141681B2 - Motor, power device and electric power steering device - Google Patents

Description

  The present invention relates to a motor, a power device using the motor, and an electric power steering device using the power device, and particularly to fixing a rotation sensor of a motor and adjusting a phase relationship between a motor induced voltage and a rotation sensor signal. Is also suitable

A brushless motor employed in an electric power steering device (hereinafter referred to as an EPS system) generally uses a rotation sensor (see, for example, Patent Document 1). The rotation sensor stator is rotatably fixed to the outside of the flange motor, and the rotation sensor stator is fixed in the rotational direction by a screw. Phase adjustment of the motor induced voltage and the rotation sensor signal is performed by loosening a screw that fixes the flange and the rotation sensor stator.
JP 2001-78393 A

  In the motor of Patent Document 1, the resolver stator fixed to the flange is used as means for correcting the phase deviation between the induced voltage and the resolver signal due to the manufacturing variation in the phase relationship between the rotor and the resolver rotor, and the phase variation between the case and the flange. The method of adjusting the position of is adopted. That is, in order to provide a mechanism that can adjust the phase relationship between the flange and the resolver stator, a screw for fixing the resolver stator to the flange inside the motor or the gear box is required. In this case, consideration must be given to a structure in which the motor is not locked or short-circuited even when the screw is loosened or dropped.

  The present invention has been made in consideration of the above points, and in a motor equipped with a rotation sensor, a screw for fixing the rotation sensor is not required inside the motor, and the phase of the motor induced voltage and the rotation sensor signal is adjusted. An object of the present invention is to propose a motor that can be easily performed, a power unit using the motor, and an electric power steering device using the power unit.

  The present invention relates to a cylindrical stator case, a fixing member to which the stator case is fixed, a shaft rotatably disposed on a substantially central axis in the stator case, a rotor fixed to the shaft, and a stator In a motor including a stator provided inside a case, a rotation sensor stator that detects rotation of the rotor is fixed to a fixing member, and the rotation sensor rotor is fixed directly or indirectly to a shaft, A position adjustment mechanism for adjusting the positional relationship with the stator case is provided. By this position adjustment mechanism, the phase relationship between the motor induced voltage and the rotation sensor signal can be adjusted.

  In the motor of the present invention, the stator case in which the stator is fixed and the fixing member to which the rotation sensor stator is fixed are fixed, and the positional relationship between the stator case and the fixing member is adjustable. Since the phase relationship between the motor induced voltage and the rotation sensor signal is adjusted by adjusting the positional relationship between the stator case and the fixing member, the rotation sensor stator may be press-fitted or bonded to the fixing member, and the motor or gear box No screw is required. The position of the rotation sensor stator is not directly adjusted, but the positions of the fixing member to which the rotation sensor stator is fixed and the stator case are adjusted.

  Further, the position adjusting mechanism may fix the stator case to the fixing member at an arbitrary axis angle within a predetermined range.

  Furthermore, the phase relationship between the motor induced voltage and the rotation sensor signal is adjusted by rotating the stator case and the fixed member relatively in the axial direction.

  Further, the position adjusting mechanism has a long hole in the circumferential direction provided in one of the stator case and the fixing member, and passes through the long hole and is screwed to the other, thereby connecting the stator case and the fixing member. It can be provided with a screw to be fixed.

  Thus, by providing a long hole in one of the stator case and the fixing member, after adjusting the mutual position of the stator case and the fixing member, the stator case and the fixing member at any position within the range of the long hole. Can be fixed.

  Further, the position adjustment mechanism may include a caulking mechanism that fixes the fixing member and the stator case so as to be relatively movable in the circumferential direction while preventing movement in the axial direction.

  Thereby, the mutual position of a stator case and a fixing member is adjustable. The relative circumferential movement distance between the fixing member and the stator case may be at least within a range in which the phase of the motor induced voltage and the rotation sensor signal can be adjusted. Moreover, you may combine with the long hole formed in the stator case. The caulking mechanism can be composed of a claw projecting from one of the stator case and the fixing member toward the other, and a recess such as a caulking groove provided on the other and engaged with the claw.

  The position adjustment mechanism may include a caulking mechanism that fixes the fixing member and the stator case after the phase adjustment between the fixing member and the stator case.

  Further, the fixing member may be formed integrally with the outer shell part of the motor control device that controls the motor.

  Thereby, a motor and a motor control apparatus can be collectively reduced in size.

  Moreover, in a power unit including a motor and a reduction gear box including a reduction mechanism that reduces the rotation speed of the motor, any of the above-described motors may be applied. A reduction gear box used in this power unit is connected to, for example, an output shaft of a motor, a worm shaft having a worm pinion formed in a part thereof, a worm wheel connected to a steering shaft and meshed with the worm pinion, It can be configured by including a speed reduction mechanism that houses and holds the worm shaft and the worm wheel. The speed reduction mechanism may be a mechanism that combines a spur gear and a planetary gear. The power unit having such a configuration is used for a power unit used in combination with a gear, such as a geared motor used in an industrial machine or a vehicle-mounted power window motor.

  Furthermore, in the electric power steering apparatus provided with the power unit, the power unit described above may be applied.

  Thereby, in the electric power steering apparatus, the phase relationship between the motor induced voltage and the rotation sensor signal can be easily adjusted.

  Further, by making the fixing member a part of the reduction gear box, the device can be simplified, and the power device and the electric power steering device can be downsized and the manufacturing cost can be reduced.

  Further, the present invention is provided in a cylindrical stator case, a shaft rotatably disposed on a substantially central axis in the stator case, a rotor fixed to the shaft, and an inner side of the stator case. In a power device including a motor including a stator and a reduction gear box, a rotation sensor stator that detects rotation of the rotor is fixed to the reduction gear box, and the rotation sensor rotor is directly attached to the shaft. Alternatively, it is provided with a position adjusting mechanism that is fixed indirectly and adjusts the positional relationship between the reduction gear box and the stator case. By this position adjustment mechanism, the phase relationship between the motor induced voltage and the rotation sensor signal can be adjusted.

  According to the motor of the present invention, the power device using the motor, and the electric power steering device using the power device, the positional relationship between the stator case and the fixing member is adjusted with respect to the phase relationship between the motor induced voltage and the rotation sensor signal. It is done by. Therefore, the rotation sensor stator may be press-fitted or bonded to the fixing member, and no screw is required inside the motor or gear box, and the rotation sensor stator is directly or indirectly fixed to the stator case. By adjusting the position, the phase shift between the motor induced voltage and the rotation sensor signal can be easily corrected.

1 is a cross-sectional view of a motor according to a first embodiment of the present invention. It is an exploded view of the motor. It is a perspective view of the motor which concerns on 2nd Embodiment of this invention. It is a perspective view of the motor which concerns on 3rd Embodiment of this invention. It is sectional drawing of the motor which concerns on 4th Embodiment of this invention, and is the figure which showed the example by which the resolver stator was fixed to the motor side with respect to the worm | warm. It is sectional drawing of the motor which concerns on 4th Embodiment of this invention, and is the figure which showed the example by which the resolver stator was fixed to the opposite side to a motor with respect to the worm | warm. It is sectional drawing of the motor which concerns on 5th Embodiment of this invention. It is sectional drawing of the motor which concerns on 6th Embodiment of this invention. It is sectional drawing of the electric power steering apparatus which concerns on 7th Embodiment of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Motor, 3 ... Stator case, 4 ... Stator, 6 ... Rotor, 7 ... Resolver rotor, 8 ... Flange (fixing member), 10 ... Resolver stator (rotation sensor stator), 14 ... Long hole, 21 ... Stator case , 22 ... flange (fixing member), 23 ... caulking mechanism (position adjusting mechanism), 25 ... claw, 28 ... caulking groove, 35 ... motor, 37 ... stator case, 38 ... control device case (fixing member), 40 ... Motor, 41, 42 ... Reduction gear box (fixed member), 46 ... Flange (fixed member), 49 ... Main gear, 50a ... Driven gear, 51 ... Planetary gear, 60 ... Motor controller, 100 ... Power device, 101 ... Electric power steering device

<First Embodiment>
FIG. 1 is a cross-sectional view of a motor 1 according to the first embodiment. The motor 1 includes a cylindrical stator case 3 having an opening 2 at one end, a stator 4 press-fitted and fixed to the inner surface of the stator case 3, and a shaft that is rotatably supported in the radially inner space of the stator 4. 5 and a rotor 6 fixed to the shaft 5. A resolver rotor (rotation sensor rotor) 7 is fixed to the shaft 5 on the opening side of the rotor 6.

  A flange (fixing member) 8 is fixed to the opening 2 of the stator case 3 by a screw 9. The flange 8 is integrally provided with a recess 11 into which a resolver stator (rotation sensor stator) 10 is press-fitted and fixed. The recess 11 is formed in a region surrounded by an inner side surface 8a of the flange 8 and an annular wall portion 8b protruding from the inner side surface 8a inward in the motor axial direction. When the shaft 5 is accommodated in the stator case 3, the resolver rotor 7 fixed to the shaft 5 is paired with the resolver stator 10, and the rotor 6 is paired with the stator 4. That is, in the motor 1 of the first embodiment, the stator 4 is fixed to the stator case 3 and the resolver stator 10 is fixed to the flange 8.

  FIG. 2 is an exploded perspective view of the motor 1. The stator case 3 is provided with at least two fixing rods 13 extending radially outward on the periphery of the opening 2 as a position adjusting mechanism, and the fixing rod 13 is formed with a long long hole 14 in the circumferential direction. On the flange 8 side, a screw hole 15 is formed at a position corresponding to the long hole 14.

  The motor 1 according to the first embodiment is configured as described above, so that the positional relationship between the flange 8 and the stator 4 can be adjusted when the screw 9 is tightened. More specifically, the shaft 5 is accommodated in the stator case 3, and the rotor 6 and the stator 4, and the resolver rotor 7 and the resolver stator 10 are combined. Next, the flange 8 and the stator case 3 are relatively rotated around the axis, and the positional relationship between the flange 8 and the stator 4 is adjusted while confirming the relationship between the resolver signal and the induced voltage. After the adjustment, the flange 8 and the stator case 3 are fixed by the screw 9.

  Thereby, the phase deviation between the motor induced voltage and the resolver signal due to the manufacturing variation in the phase relationship between the rotor 6 and the resolver rotor 7 and the manufacturing variation in the phase relationship between the stator case 3 and the stator 4 can be easily corrected. Even when the screw 9 is loosened or dropped out, the screw 9 is positioned outside the stator case 3 so that the motor 1 can be prevented from locking or short-circuiting, and the phase difference between the motor induced voltage and the resolver signal can be achieved. It is easy to readjust.

  In the first embodiment, the fixing of the flange 8 and the resolver stator 10 and the fixing of the stator 4 and the stator case 3 are press-fit fixing, but an adhesive fixing or an integral resin mold may be used. Moreover, although the long hole 14 was provided in the stator case 3 as a position adjustment mechanism, you may provide a long hole in the flange 8 side.

Second Embodiment
FIG. 3 is a perspective view showing a motor 20 as a second embodiment of the present invention. In addition, since the internal structure of the motor 20 is the same as that of the said 1st Embodiment, it abbreviate | omits the description about the same structure using the same code | symbol.

  The stator case 21 of the second embodiment is configured to be temporarily fixed to a flange (fixing member) 22 by a caulking mechanism (position adjusting mechanism) 23. The stator case 21 is provided with claws 25 that protrude outward in substantially the axial direction at at least two locations on the edge. The claw 25 includes a body portion 26 that extends outward and a flange portion 27 that protrudes radially inward from the tip of the body portion 26, and a crimping groove 28 that engages the flange portion 27 is formed on the peripheral surface of the flange 22. Is formed. The caulking groove 28 extends in the circumferential direction of the flange 22 and has a dimension that provides a margin in the circumferential direction with respect to the width of the claw 25. The claw 25 and the caulking groove 28 constitute a caulking mechanism 23. Note that the caulking strength of the claw 25 and the caulking groove 28 only needs to be sufficient to withstand the performance measurement of the motor alone and vibration during transportation, and ensuring the coupling strength between the stator case 21 and the flange 22 when mounted on the vehicle. This is done by fastening the projecting screw seat surface 22b together with the flange 22 with a gear box mounting bolt 30. As in the first embodiment, a long hole 31 is formed in the screw seat surface 22b along the circumferential direction, and a screw hole 15 is formed in the flange 22.

  The motor 20 according to the second embodiment formed as described above can temporarily fix the stator case 21 and the flange 22 by the caulking mechanism 23. Since the caulking groove 28 engaged with the claw 25 has play, the stator case 21 and the flange 22 are not detached from each other, but they are rotated relative to each other so that the positional relationship between the stator case 21 and the flange 22 is maintained. The phase relationship between the motor induced voltage and the resolver signal can be adjusted. Thereby, the stator case 21 and the flange 22 before adjustment are prevented from being detached, and the fixing work by the bolt 30 is facilitated. In addition, the same effect as the first embodiment can be obtained.

<Third Embodiment>
FIG. 4 is a perspective view of a motor according to the third embodiment. In addition, since the internal structure of the motor 35 is the same as that of the said 1st Embodiment, it abbreviate | omits the description about the same structure using the same code | symbol.

  The motor 35 includes a stator case 37 and a motor control device case (outer shell part) 38 to which the stator case 37 is fixed. That is, in the third embodiment, the flanges 8 and 22 in the first and second embodiments are formed integrally with the case 38 of the motor control device. The stator case 37 has the same configuration as that of the stator case 3, and a screw hole 15 is formed in the case 38 of the motor control device in the same manner as the flange 8.

  A resolver stator (not shown) is press-fitted or adhesively fixed to a case 38 of the motor control device, and the stator case 37 and the motor control device case 38 are fixed by screws 9 as in the first embodiment. Yes.

  With this configuration, the motor and the motor control device can be reduced in size. Note that, similarly to the case of the second embodiment, the stator case 37 and the case 38 of the motor control device may be crimped and fixed by a crimping mechanism. In addition, the same effect as the first embodiment can be obtained.

<Fourth embodiment>
5 and 6 are sectional views of a motor according to the fourth embodiment. In the fourth embodiment, the motor 40 is fixed to the reduction gear box 41 of the power unit 100. The power unit 100 is connected to a motor 40, a motor shaft (output shaft) 5 of the motor 40, a worm shaft 45 a having a worm pinion 45 formed on a part thereof, and a steering shaft. A meshed worm wheel 44 and a reduction gear box 41 that houses and holds a reduction mechanism including a worm shaft 45a and a worm wheel 44 are provided. In addition, since the internal structure of the motor 40 is the same as that of the said 1st Embodiment, it abbreviate | omits the description about the same structure using the same code | symbol. This power unit 100 is used for a power unit used in combination with a gear, such as a geared motor used in an industrial machine or a vehicle-mounted power window motor. In addition, an electric power steering device can be configured using the power device 100.

The resolver stator 10 included in the motor 40 is fixed to the reduction gear box 41 instead of the inside of the motor 40. FIG. 5 shows the resolver stator 10 fixed to the worm pinion 45 on the motor 40 side, and FIG. 6 shows the worm pinion 45 fixed to the opposite side of the motor 40. In any case, the stator case 3 is provided with a long hole 14 which is long in the circumferential direction. Thereby, the phase relationship between the resolver signal and the motor induced voltage can be adjusted by adjusting the positional relationship between the stator case 3 and the reduction gear box 41. In the fourth embodiment, the motor 40 is fixed to the reduction gear box 41 (fixing member) by a screw 47 penetrating the flange 46. More specifically, the relative positions of the flange 46 and the reduction gear box 41 are determined by the screw 47, and the positions of the stator case 3 and the flange 46 are adjusted using the long holes 14 provided in the stator case 3. As a result, the positional relationship between the stator case 3 and the reduction gear box 41 can be adjusted.
Further, instead of providing the long hole 14 in the stator case 3, the screw hole 46a of the flange 46 may be a long hole in the circumferential direction. In this case, after the relative positions of the stator case 3 and the flange 46 are determined, the positions of the reduction gear box 41 and the flange 46 are adjusted using the long holes 46a provided in the flange 46, resulting in the stator case as a result. 3 and the reduction gearbox 41 can be adjusted.

  With this configuration, the motor 40 according to the fourth embodiment is similar to the first embodiment in that the phase difference between the rotor 6 and the resolver rotor 7 is manufactured, and the stator case 3 and the flange 46. Alternatively, the phase shift between the motor induced voltage and the resolver signal due to manufacturing variations in the phase relationship between the stator case 3 and the stator 4 can be easily corrected, and the screw 47 can be removed even when the screw 47 is loosened or dropped. Since the motor 40 is positioned outside the stator case 3, the motor 40 can be structured not to be locked or short-circuited, and the readjustment of the motor induced voltage and the phase shift of the resolver signal is easy.

  In the fourth embodiment, the worm shaft 45a formed integrally with the worm pinion 45 and the motor shaft 5 are driven to rotate by fitting a spline or the like, but the worm shaft 45a and the motor shaft 5 are integrated. It may be formed. Further, the stator case 3 is fixed to the reduction gear box 41 via the flange 46 by the screw 47, but the stator case 3 may be directly fixed to the reduction gear box 41 by the screw 47. In this case, the flange 46 and the bearing 48 fixed to the flange 46 are not necessary. As a result, the apparatus is simplified, and the power device 100 including the motor 40 and the reduction gear box 41 and the electric power steering device using the power device 100 can be reduced in size and manufacturing cost can be reduced. Further, the flange 46 and the reduction gear box 41 may be integrated.

<Fifth Embodiment>
FIG. 7 is a sectional view of a motor according to the fifth embodiment. In the fifth embodiment, a reduction gear in which a reduction gear box and a case (outer shell part) of a control device are integrally formed in place of the reduction gear box 41 of the power unit 100 of the fourth embodiment shown in FIG. A case where the box 42 is used will be described.

  Similarly to the case shown in FIG. 5 of the fourth embodiment, the stator case 3 or the flange is adjusted so that the phase relationship between the resolver signal and the induced voltage is adjusted by adjusting the positional relationship between the stator case 3 and the reduction gear box 42. 46 screw holes (not shown) are elongated holes in the circumferential direction.

  As shown in FIG. 7, the reduction gear box 42 is provided with a recess 42 a that houses a motor control device 60 that controls the motor 40, and the opening of the recess 42 a is closed by a control device cover 43. At least one control board 62 including an electronic component 62 that constitutes the motor control device 60 is attached to the recess 42a, and is connected to the motor by wiring (not shown) so that the motor 40 can be controlled. In addition, since the internal structure of the motor 40 is the same as that of the said 1st Embodiment, it abbreviate | omits the description about the same structure using the same code | symbol. Thus, instead of the reduction gear box 41 of the power unit 100 of the fourth embodiment, a reduction gear box 42 in which the case of the reduction gear box and the control device is integrally formed may be used as in the fourth embodiment. Effects can be obtained.

<Sixth Embodiment>
FIG. 8 is a sectional view of a motor according to the sixth embodiment. In the sixth embodiment, a case where a speed reduction mechanism including a spur gear and a planetary gear is used instead of the speed reduction mechanism of the fourth embodiment will be described.

  As in the case shown in FIGS. 5 and 6 of the fourth embodiment, the phase relationship between the resolver signal and the induced voltage is adjusted by adjusting the positional relationship between the stator case 3 and the reduction gear box 41. 3 or a screw hole (not shown) of the flange 46 is a long hole in the circumferential direction.

  As shown in FIG. 8, the main driving gear 49 is fixed to a shaft 49 a coupled so as to rotate around the motor shaft 5, and the resolver rotor 7 is fixed to the opposite side of the shaft 49 a to the motor. The driven gear 50a meshes with the main driving gear 49 and is rotatably supported on the output shaft 54. The sun gear 50b of the planetary gear mechanism is formed integrally with the driven gear 50a or coupled so as to be rotated. In addition, 52 is an outer ring gear and 51 is a planetary gear. The planet carrier 53 is fixed to the output shaft 54 so as to transmit the revolution movement of the planetary gear 51 to the output shaft 54. In addition, since the internal structure of the motor 40 is the same as that of the said 1st Embodiment, it abbreviate | omits the description about the same structure using the same code | symbol. Thus, the same effect as that of the fourth embodiment can be obtained by using a spur gear and a planetary gear instead of the speed reduction mechanism of the fourth embodiment. Note that the speed reduction mechanism included in the speed reduction gear box 41 is not limited to the speed reduction mechanism described in the fourth to sixth embodiments.

  As shown in FIGS. 5 to 8, the rotation of the motor can be detected by fixing the resolver rotor 7 to the gear shaft (shaft 49 a) that rotates with the motor shaft 5. For this reason, it can be set as the structure which fixes the resolver rotor 7 to the reduction gear box 41 irrespective of the detailed structure of a reduction mechanism.

  In the first to sixth embodiments, the resolver is used as the rotation sensor. However, the rotation sensor to which the present invention can be applied is a rotation sensor rotation formed by a rotor and a rotation sensor stator formed separately from the stator. For example, a rotation sensor using a Hall element is applicable.

<Seventh embodiment>
An example of the electric power steering apparatus of the present invention will be described below with reference to FIG.
The electric power steering apparatus 101 controls the motor 1 that is driven according to the steering torque applied to the steering wheel 102, the power transmission mechanism 120 that transmits the auxiliary steering torque generated by the motor 1 to the steering shaft 103, and the motor 1. ECU (control device) etc. which are not illustrated.

  A part of the steering shaft 103 is housed in a steering column (not shown), and includes an input shaft 103a, an upper output shaft 103b, and a lower output shaft 103c. The input shaft 103a has an upper end fixed to the steering wheel 102 and a lower end connected to the upper end of the upper side output shaft 103b via a torsion bar (not shown). The lower end of the upper side output shaft 103b is connected to the lower side output shaft 103c via the universal joint 104a, and the lower side output shaft 103c is connected to the tie rod 106 of the traveling vehicle via the universal joint 104b and the pinion rack mechanism 105. Has been.

  When the steering wheel 102 is steered by the driver and the torsion bar is twisted, a torque sensor (not shown) detects the steering torque applied to the steering wheel 102 based on the twist. The ECU calculates the auxiliary steering torque (assist torque) by the motor 1 based on the steering torque detected by the torque sensor and the vehicle speed from the vehicle speed sensor, and drives the motor 1 so as to generate the calculated auxiliary steering torque. . As a result, the auxiliary steering torque from the motor 1 is applied to the upper output shaft 103b of the steering shaft 103 via the power transmission mechanism 120 including a speed reduction mechanism described later, and the driver's steering torque is assisted.

  In addition, this application is based on the Japanese application (Japanese Patent Application No. 2007-077105) of an application on March 23, 2007, The content is taken in here as a reference.

Claims (10)

A cylindrical stator case, a fixing member to which the stator case is fixed, a shaft rotatably disposed on a substantially central axis in the stator case, a rotor fixed to the shaft, and a stator case In a motor provided with a stator provided on the inside,
A rotation sensor stator for detecting rotation of the rotor is fixed to the fixing member, and the rotation sensor rotor is fixed directly or indirectly to the shaft;
A position adjusting mechanism for adjusting a positional relationship between the fixing member and the stator case ;
By rotating the stator case relative to the fixing member, an induced voltage of the motor is adjusted with respect to a sensor signal of a rotation sensor composed of the rotation sensor stator and the rotation sensor rotor, and the induced voltage and the motor characterized that you adjust the phase of the sensor signal.   2. The motor according to claim 1, wherein the position adjustment mechanism is a mechanism in which the stator case is fixed to the fixing member at an angle around an axis within a predetermined range.   The position adjusting mechanism includes a long hole in a circumferential direction provided in one of the stator case and the fixing member, and the stator case and the fixing by passing through the long hole and screwing to the other. The motor according to claim 2, further comprising a screw for fixing the member.   3. The position adjusting mechanism includes a caulking mechanism that fixes the fixing member and the stator case so as to be relatively movable in the circumferential direction while preventing movement in the axial direction. The motor described.   The motor according to claim 2, wherein the position adjusting mechanism includes a caulking mechanism that fixes the fixing member and the stator case after phase adjustment between the fixing member and the stator case.   6. The motor according to claim 1, wherein the fixing member is formed integrally with an outer shell part of a motor control device that controls the motor. A motor according to any one of claims 1 to 6;
A power device comprising: a reduction gear box including a reduction mechanism that reduces the rotation speed of the motor. A cylindrical stator case, a shaft rotatably disposed on a substantially central axis in the stator case, a rotor fixed to the shaft, and a stator provided inside the stator case. A motor,
In a power unit comprising a reduction gear box,
A rotation sensor stator for detecting rotation of the rotor is fixed to the reduction gear box, and a rotation sensor rotor is fixed directly or indirectly to the shaft;
A position adjusting mechanism for adjusting a positional relationship between the reduction gear box and the stator case ;
By rotating the stator case relative to the reduction gear box, an induced voltage of the motor is adjusted with respect to a sensor signal of a rotation sensor composed of the rotation sensor stator and the rotation sensor rotor, and the induced voltage power unit, characterized that you adjust the phase of the sensor signal.   The power unit according to claim 7 or 8, wherein the reduction gear box is formed integrally with an outer shell part of a motor control device that controls the motor.   An electric power steering apparatus comprising the power unit according to any one of claims 7 to 9.

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