JP2017099059A - Motor device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a motor device which further suppresses deterioration of the magnetic characteristics of the stator.SOLUTION: A motor 10 has a stator 20, a rotor 30 arranged on the inner periphery of the stator 20, and a rotating shaft 11 fitted and fixed to the inner periphery of the rotor 30. The stator 20 has a stator core 21, and a coil 24 wound around the teeth 23 of the stator core 21. The stator core 21 has a yoke 22, and teeth 23. In the opposite side faces of the yoke 22 in the axial direction, fitting holes 25, 26 of such depth as not penetrating are provided in the axial direction. A fitting hole 42c is provided in the fitting hole 25 in the flange 42b of a bearing holder 42. A fitting hole 54b is provided in a warm housing 54. The opposite ends of a pin 70 are inserted, respectively, into the fitting holes 25 and 42c. The opposite ends of a pin 71 are inserted, respectively, into the fitting holes 26 and 54b.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a motor device.

  Conventionally, a motor device has been configured by housing a stator in which a yoke and a plurality of teeth protruding radially inward of the yoke are stacked in a motor housing (Patent Document 1). The stator is housed in the motor housing by being press-fitted into the motor housing, and is fixed inside the motor housing.

JP 2014-180103 A

  By the way, when the stator is press-fitted into the housing, its shape slightly changes. The stator has a characteristic that its magnetic characteristics deteriorate as the pressure is applied (for example, as it is compressed). For this reason, when the stator is press-fitted into the housing, the magnetic characteristics of the stator deteriorate, so that the motor can only generate torque smaller than the original output torque. This is because loss torque is generated in the motor due to deterioration of the magnetic characteristics. Further, since the magnetic characteristics at each portion of the tooth are not uniform due to the press-fitting, a so-called torque fluctuation occurs in the motor.

  The objective of this invention is providing the motor apparatus which suppresses that the magnetic characteristic of a stator deteriorates more.

  A motor device capable of achieving the above object includes a rotor fixed to a rotating shaft, a stator disposed with a gap around the outer periphery of the rotor, and a first bearing provided at a first end of the rotating shaft. A reduction gear housing having a bearing holding portion fitted with an outer peripheral surface thereof, a holding hole fitted with a second bearing provided at a second end portion of the rotating shaft, the bearing holding portion and the stator And a second positioning portion for fixing the stator and the speed reducer housing using the concave-convex fitting.

  According to this configuration, the stator and the bearing holding portion are fixed by being unevenly fitted through the first positioning portion. The stator and the reduction gear housing are fixed by being concavo-convexly fitted via the second positioning portion. Conventionally, each member of the motor device is fixed by press-fitting each member of the motor device such as a stator into the motor housing. However, each member of the motor device is fixed by the first positioning portion and the second positioning portion. Can be fixed. For this reason, the deterioration of the magnetic characteristics of the stator is suppressed by the amount that the stator need not be press-fitted.

  In the above motor device, the stator has fitting holes provided at both end portions in the direction along the rotation axis of the yoke, and the bearing holding portion faces the stator in the direction along the rotation axis. The speed reducer housing has a second hole provided in a portion facing the stator in a direction along the rotation axis, and the first reducer housing Preferably, the positioning portion is inserted into the fitting hole and the first hole portion, and the second positioning portion is inserted into the fitting hole and the second hole portion.

  According to this configuration, by inserting the first positioning portion into the fitting hole and the first hole portion, the stator and the bearing holding portion can be fixed, and the second positioning portion is fitted into the fitting hole. And the second hole, the stator and the reducer housing can be fixed.

In the motor device described above, it is preferable that a plurality of the first positioning portions and the second positioning portions are provided in the circumferential direction of the stator.
In the motor device, the stator core is configured by a plurality of divided stator cores divided in a circumferential direction, and the first positioning portion and the second positioning portion correspond to a divided yoke of the divided stator core. Are preferably provided.

  According to these configurations, by providing a plurality of the first positioning portion and the second positioning portion, the stress acting on any one of the first positioning portion and the second positioning portion is the first The number of positioning parts and the number of second positioning parts are distributed.

  In the motor apparatus, the stator includes a yoke, a stator core configured by teeth projecting radially inward of the yoke, and a coil wound around the teeth, and in the circumferential direction of the yoke, It is preferable that a fitting hole corresponding to the first positioning portion and the second positioning portion is provided in a portion facing the teeth and a central portion in the radial direction of the yoke.

  According to this configuration, since the fitting hole can be provided in a portion where the magnetic flux density is small, when the first positioning part and the second positioning part are inserted into the fitting hole, the first positioning part And it suppresses that a 2nd positioning part prevents the flow of more magnetic flux.

In the motor device described above, it is preferable that the second positioning portion is unevenly fitted in a fitting hole provided in the speed reducer housing via an elastic body.
According to this configuration, since the fitting hole and the second positioning portion are concavo-convexly fitted via the elastic body, vibration of the stator can be suppressed when the stator vibrates.

In the motor device described above, it is preferable that each of the first positioning unit and the second positioning unit is a pin.
According to this configuration, by using the pins as the first positioning portion and the second positioning portion, the stator and the bearing holding portion are fixed, and the stator and the reduction gear housing are fixed.

In the motor device described above, it is preferable that an outer peripheral surface between the bearing holding portion and the reduction gear housing is covered with a film-like resin.
According to this configuration, the film-like resin covers the outer peripheral surface between the bearing holding portion and the speed reducer housing, thereby preventing foreign matter from entering the motor device.

  According to the motor control device of the present invention, it is possible to further suppress the deterioration of the magnetic characteristics of the stator.

The schematic diagram which shows the schematic structure about the motor apparatus of one Embodiment. The schematic diagram of the motor apparatus at the time of cut | disconnecting a motor apparatus along the 2-2 line of FIG. The perspective view which shows schematic structure of a pin about the motor apparatus of one Embodiment. The figure which shows the relationship between the stress of a tooth | gear, and a loss torque about the motor apparatus of one Embodiment.

Hereinafter, an embodiment of the motor device will be described.
As shown in FIG. 1, the motor 10 includes a stator 20 that is fitted and fixed between the bearing holder 42 and the speed reduction mechanism 50, a rotor 30 that is disposed with a gap in the inner periphery of the stator 20, The rotary shaft 11 is fitted and fixed to the inner periphery, and two bearings 41 and 43 that rotatably support the rotary shaft 11 are provided. An ECU (electronic control unit) 60 that controls the operation of the motor 10 is provided on the end surface of the motor 10 opposite to the speed reduction mechanism 50.

The stator 20 includes a cylindrical stator core 21 and a coil 24 wound around a tooth 23 of the stator core 21.
As shown in detail in FIG. 2, the stator core 21 includes an annular yoke 22 and a plurality of teeth 23 that are arranged along the circumferential direction on the inner peripheral surface of the yoke 22 and receive magnetic flux from the rotor 30. . The stator core 21 is composed of a plurality of divided stator cores 21a that are annularly arranged at equal pitch intervals in the circumferential direction. The split stator core 21a includes an arc-shaped split yoke 22a and split teeth 23a that protrude radially inward of the split yoke 22a. The divided stator core 21a has a substantially T shape when viewed from the axial direction of the rotary shaft 11. The end surfaces in the circumferential direction of the adjacent divided yokes 22a are in contact with each other. These divided yokes 22a are arranged at equal pitch intervals in the circumferential direction, so that the yoke 22 has an annular shape. These divided yokes 22a are fixed to each other by welding or the like. Further, each coil 24 is wound around the divided tooth 23a via an insulator such as a resin.

  As shown in FIG. 1, the rotor 30 includes an annular rotor core 31 that is attached to the rotary shaft 11 so as to be integrally rotatable, and a cylindrical magnet 32 that is attached to the outer periphery of the rotor core 31 so as to be integrally rotatable. ing. In the magnet 32, for example, a plurality of magnets are arranged in the circumferential direction. These magnets are arranged such that their magnetic poles alternate between the N pole and the S pole in the circumferential direction of the rotor core 31.

  The speed reduction mechanism 50 is provided as a transmission mechanism for transmitting the output torque of the motor 10 to a target to which the output torque is applied (for example, a turning shaft in a steering device). The speed reduction mechanism 50 includes a worm shaft 51 as a drive side member of the transmission mechanism and a worm wheel 52 as a driven side member of the transmission mechanism that meshes with the worm shaft 51. The worm shaft 51 and the worm wheel 52 are accommodated in a worm housing 54. The worm housing 54 is provided on the second end side of the rotating shaft 11 (below the rotating shaft 11 in the drawing).

  The worm shaft 51 is connected to the rotating shaft 11 of the motor 10 so as to be integrally rotatable. A recess 51a is provided at the first end of the worm shaft 51 (the upper end surface of the worm shaft 51 in FIG. 1). The inner diameter of the recess 51 a is set slightly larger (or equal) than the outer diameter of the rotating shaft 11. By inserting the rotating shaft 11 into the recess 51 a provided in the worm shaft 51, the rotating shaft 11 is fixed in a state of being fitted to the worm shaft 51. Thereby, the worm shaft 51 is rotationally driven by the motor 10. A worm gear 53 is provided on the outer peripheral surface of the worm shaft 51. The worm gear 53 and the worm wheel 52 mesh with each other. When the motor 10 rotationally drives the worm shaft 51, the worm wheel 52 is rotationally driven through meshing of the worm gear 53 and the worm wheel 52.

  A bearing 41 is provided on the outer periphery of the first end (upper in FIG. 1) of the rotating shaft 11. The first end of the rotating shaft 11 is supported via a bearing 41 so as to be rotatable with respect to the bearing holder 42. The bearing holder 42 includes a cylindrical portion 42a and a flange portion 42b provided on a peripheral surface at an end portion of the cylindrical portion 42a on the ECU 60 side. A gap is provided in the axial direction between the cylindrical portion 42 a and the rotor 30. Further, the outer diameter of the cylindrical portion 42 a is smaller than the inner diameter of the stator 20. Further, when viewed from the direction orthogonal to the axial direction, a gap is provided between the cylindrical portion 42 a and the stator 20.

The bearing 41 (the outer ring) is fitted on the inner peripheral surface of the cylindrical portion 42a. The rotating shaft 11 is supported via a bearing 41 so as to be rotatable with respect to the cylindrical portion 42a.
A bearing 43 is provided on the outer periphery of the second end (the lower end in FIG. 1) of the rotating shaft 11. The inner ring of the bearing 43 is in contact with the first end (the upper end in FIG. 1) of the worm shaft 51 in the axial direction. The outer ring of the bearing 43 is fitted in the inner peripheral surface of the accommodation hole 54 a provided in the worm housing 54. The inner diameter of the accommodation hole 54 a is set to be larger than the outer diameters of the rotating shaft 11 and the worm shaft 51, and is set to be slightly larger (almost equal) than the outer diameter of the bearing 43.

  The second end portion (lower end in FIG. 1) of the worm shaft 51 is provided with a reduced diameter portion 51b whose outer diameter is smaller than other portions. The outer diameter of the reduced diameter portion 51 b is set to be almost the same as the outer diameter of the rotating shaft 11. A bearing 44 is provided on the outer peripheral surface of the reduced diameter portion 51 b of the worm shaft 51. The inner ring of the bearing 44 is fitted on the outer peripheral surface of the reduced diameter portion 51b. The outer ring of the bearing 44 is fitted in the inner peripheral surface of the accommodation hole 54a.

  On the first end surface (upper end in FIG. 1) of the stator core 21 (yoke 22) in the axial direction, a fitting hole 25 having a depth that does not penetrate is provided along the axial direction. A fitting hole 26 having a depth that does not penetrate is provided in the second end portion (lower end in FIG. 1) in the axial direction of the stator core 21 (yoke 22). The fitting holes 25 and 26 are provided coaxially with each other. A plurality of fitting holes 25 and 26 are provided at intervals in the circumferential direction. As shown in FIG. 2, the fitting hole 25 is provided in the central portion of the divided yoke 22a of the divided stator core 21a. The central portion of the divided yoke 22a is an intermediate position in the radial direction and an intermediate position in the circumferential direction in the divided arc shape. The reason why the fitting hole 25 is provided in the central portion of the divided yoke 22a is to avoid a portion where the density of the magnetic flux M from the rotor 30 shown by a broken line in FIG. 2 is high (the higher the density of the broken line, the higher the magnetic flux Representing high density). For example, when the fitting hole 25 is provided in a portion where the density of the magnetic flux M is high and a pin or the like is inserted into the fitting hole 25, the flow of more magnetic flux will be hindered. For this reason, the fitting hole 25 is provided in the part where the density of the magnetic flux M in the split stator core 21a is low. Note that the density of the magnetic flux M is lower in the divided yoke 22a than in the divided teeth 23a. This is because the divided yoke 22a is further away from the magnet 32 and away from the coil 24 than the divided teeth 23a.

  As shown in FIG. 1, a fitting hole 42 c is provided on a surface of the flange portion 42 b of the bearing holder 42 that faces the fitting hole 25 in the axial direction. The fitting hole 42c is provided at a depth that does not penetrate the flange portion 42b. A plurality of fitting holes 42 c are provided in the circumferential direction of the bearing holder 42 corresponding to the fitting holes 25.

  A fitting hole 54 b is provided on the surface of the worm housing 54 that faces the fitting hole 26 in the axial direction. As illustrated as an example, the fitting hole 54 b may be provided on the wall surface of the worm housing 54 where the worm wheel 52 is accommodated. A plurality of fitting holes 54 b are provided in the circumferential direction of the worm housing 54 corresponding to the fitting holes 26.

  In order to fix the bearing holder 42 and the stator core 21 so as not to move both in the circumferential direction and in the axial direction, both end portions of the pin 70 as a positioning portion are inserted into the fitting hole 25 and the fitting hole 42c, respectively. Further, in order to fix the worm housing 54 and the stator core 21 so as not to move both in the circumferential direction and in the axial direction, both end portions of a pin 71 as a positioning portion are inserted into the fitting hole 26 and the fitting hole 54b, respectively. . In other words, the bearing holder 42 and the stator core 21 are fixed to each other by fitting the bearing holder 42 and the stator core 21 with the concave and convex portions via the pins 70. In addition, the worm housing 54 and the stator core 21 are fixed by fitting the worm housing 54 and the stator core 21 through the pins 71 in an uneven manner. Here, for convenience, the depths of the fitting holes 25, 26, 42c, and 54b are set to be approximately the same. The inner diameters of the fitting holes 25, 26, and 42c are set to be approximately the same. The inner diameter of the fitting hole 54b is set larger than the inner diameter of the fitting holes 25, 26, and 42c.

  As shown in FIG. 3, the pin 70 and the pin 71 have the same shape. The pins 70 and 71 have a cylindrical flange portion 74 and cylindrical fitting portions 72 and 73 provided at both ends of the flange portion 74. The outer diameter of the flange portion 74 is set larger than the outer diameters of the fitting portions 72 and 73. The outer diameters of the fitting part 72 and the fitting part 73 are set to be equal to each other. The axial lengths of the fitting portions 72 and 73 are set to be equal to each other. The axial lengths of the fitting portions 72 and 73 are set to be approximately the same as the depths of the fitting holes 25, 26, and 54b. Further, the axial length of the flange portion 74 of the pin 70 is set to be approximately the same as the distance between the flange portion 42 b and the stator core 21. The axial length of the flange portion 74 of the pin 71 is set to be approximately the distance between the worm housing 54 and the stator core 21.

  A cylindrical elastic body 75 such as a rubber bush is disposed in the fitting hole 54b. The outer diameter of the elastic body 75 is set to be approximately the same as the inner diameter of the fitting hole 54 b, and the inner diameter of the elastic body 75 is set to be approximately the same as the outer diameter of the fitting portions 72 and 73 of the pin 71. The elastic body 75 is disposed in the radial gap between the fitting hole 54 b and the fitting portions 72 and 73 of the pin 71. For example, the electromagnetic force (magnetic force) generated when electric power is supplied to the coil 24 of the stator 20 and the magnetic force of the magnet 32 repel each other, whereby a force that causes vibration is applied to the teeth 23. Is brought into contact with the fitting hole 54b via the elastic body 75, whereby the vibration of the stator 20 is attenuated by the elastic force of the elastic body 75.

  The outer peripheral portion of the motor 10 is covered with a thin film-like resin 80. That is, the resin 80 is provided so as to cover the space from the bearing holder 42 to the worm housing 54 in the axial direction of the motor 10. As the resin 80, for example, a heat-shrinkable resin is used. The resin 80 is provided to prevent foreign matter from entering the motor 10.

  Next, the operation of this embodiment will be described. First, the case where the motor 10 is accommodated in the motor housing will be described as a comparative example. In this case, the stator 20 is press-fitted into the motor housing.

  FIG. 4 shows the relationship between the stress S acting on the stator 20 and the loss torque (iron loss) L generated in the stator 20. The loss torque L is a component of the output torque of the motor 10 that is lost electromagnetically and physically (for example, friction) due to the structure of the motor 10. That is, as the absolute value of the loss torque L is larger, the motor 10 can generate only an output torque smaller than the original output torque. As the stress S increases positively, the loss torque L increases. When the stress is positive, the stator 20 is compressed in its radial direction. Further, the loss torque L increases as the stress S increases negatively. When the stress S is negative, the stator 20 is expanded in the radial direction. In addition, when the stress S increases, the increase rate of the loss torque L is larger (the inclination is large) than when the stress S is negatively increased.

  When press-fitting the stator 20 into the motor housing, the stator 20 is accommodated in the motor housing in a compressed state in the radial direction. At this time, since the positive stress S acts on the stator 20, the loss torque L becomes large.

  On the other hand, in this embodiment, the fitting portions 72 and 73 of the pin 70 are fitted into the fitting hole 25 and the fitting hole 42c, respectively, so that the bearing holder 42 and the stator core 21 are fixed, and the pin 71 is fitted. The joint portions 72 and 73 are fitted into the fitting hole 26 and the fitting hole 54b, respectively, so that the worm housing 54 and the stator core 21 are fixed. For this reason, since the stator 20 does not need to be press-fitted into the motor housing, the positive stress S does not act on the stator 20 and the loss torque L can be reduced. For this reason, deterioration of the magnetic characteristics of the stator 20 can be suppressed. Even if the pins 70 and 71 are press-fitted into the fitting holes 25 and 26 of the stator 20, the loss torque L does not increase greatly because the compression amount of the entire stator 20 is small. Further, when the motor 10 is applied to an electric power steering apparatus, the steering feeling (steering feeling) near the neutral position of the steering wheel is improved. This is because the original output torque of the motor 10 can be obtained because the magnetic characteristics of the stator 20 are maintained.

The effect of this embodiment will be described.
(1) The bearing holder 42 and the stator core 21 are fixed by fitting both ends of the pin 70 into the fitting hole 25 and the fitting hole 42c, respectively. In addition, the worm housing 54 and the stator core 21 are fixed by fitting the fitting portions 72 and 73 of the pin 71 into the fitting hole 26 and the fitting hole 54b, respectively. For this reason, the loss torque L of the stator 20 is suppressed to the extent that the stator 20 does not need to be press-fitted into the motor housing, and the deterioration of the magnetic characteristics of the stator 20 is further suppressed.

  (2) By disposing the elastic body 75 in the fitting hole 54b, vibration of the stator 20 is suppressed. This is because the vibration of the stator 20 is absorbed by the elastic body 75 via the pin 71. Further, the elastic body 75 suppresses abnormal noise when the pin 71 contacts the fitting hole 54b.

(3) Since the peripheral surface of the motor 10 is covered with the resin 80, the entry of foreign matter into the motor 10 is suppressed.
(4) Since the motor 10 does not need to be provided with a motor housing, the motor 10 can be reduced in weight and volume.

  (5) When a plurality of fitting holes 25 and 26 are provided and the pins 70 and 71 are inserted, the stress applied to each pin is dispersed by the number of pins. For this reason, the stress which acts on one pin becomes small.

The present embodiment may be modified as follows. The following other embodiments can be combined with each other within a technically consistent range.
-In this embodiment, although the elastic body 75 was provided in the fitting hole 54b, it does not need to provide. In this case, the effect of suppressing the vibration of the stator 20 cannot be obtained, but the worm housing 54 and the stator core 21 can be fixed by the pins 71.

  -In this embodiment, although resin 80 was provided, it is not necessary to provide. Even when the resin 80 is not provided, the bearings 42 and the stator core 21 and the worm housing 54 and the stator core 21 can be fixed by the pins 70 and 71.

  -In this embodiment, although the pins 70 and 71 were used as a positioning member, it is not restricted to this. For example, it may be fixed by inlay fitting or by bolts. For example, in the case of fixing with bolts, a thread groove is provided on the inner peripheral surface of the fitting hole 42c and the fitting hole 25 that penetrates the flange part 42b in the axial direction, and the bolt is inserted into the fitting hole 25 from the flange part 42b. And fix.

  In the present embodiment, the outer diameter of the reduced diameter portion 51b is set to be almost the same as the outer diameter of the rotating shaft 11, but is not limited thereto. For example, the outer diameter of the reduced diameter portion 51b may be larger or smaller than the outer diameter of the rotating shaft 11.

  -In this embodiment, although the fitting holes 25 and 26 were provided in the center part in the yoke 22, it is not restricted to this. That is, the fitting holes 25 and 26 may be provided in the yoke 22. This is because the magnetic flux density is smaller if the yoke 22 is provided than if the yoke 23 is provided.

In the present embodiment, a plurality of fitting holes 25 and 26 are provided in the circumferential direction of the tooth 23, but only one may be provided.
-In this embodiment, although the fitting holes 25 and 26 were each provided in the depth which is not penetrated to the both ends of the yoke 22, it is not restricted to this. For example, the fitting holes 25 and 26 may be through holes communicating with each other.

  -In this embodiment, although the fitting holes 25 and 26 were provided so that it might become coaxial, it is not restricted to this. Even with different axes, the bearings 42 and the stator core 21 and the worm housing 54 and the stator core 21 can be fixed by the pins 70 and 71.

-In this embodiment, although the fitting hole 42c was provided in the depth which does not penetrate the bearing holder 42, you may provide so that the bearing holder 42 may be penetrated.
In this embodiment, the fitting hole 54b is provided so as to penetrate the wall surface of the worm housing 54. May be.

  In the present embodiment, the pins 70 and 71 have the same shape, but the outer diameters of the fitting portions 72 and 73 are different depending on the inner diameters of the fitting holes 25, 26, 42 c and 54 b. Also good. Also, the axial lengths of the fitting portions 72 and 73 of the pins 70 and 71 may be different depending on the axial depths of the fitting holes 25, 26, 42c, and 54b. The outer diameters of the flange portions 74 of the pins 70 and 71 may also be different from each other. The axial lengths of the flange portions 74 of the pins 70 and 71 are also set to be different depending on the distance between the flange portion 42b and the stator core 21 and the distance between the worm housing 54 and the stator core 21. May be. Moreover, the axial centers of the fitting portions 72 and 73 of the pins 70 and 71 may be different from each other.

  -In this embodiment, although the bearing holder 42 and the stator core 21 were unevenly fitted via the pin 70, it is not restricted to this. For example, a bearing holder (a portion corresponding to the fitting portion 73) in which the bearing holder 42 and the pin 70 are provided integrally is engaged with the stator core 21 (fitting hole 25) so that the bearing holder 42 and The stator core 21 may be fixed. In addition, the stator core (portion corresponding to the fitting portion 72) in which the stator core 21 and the pin 70 are integrally provided is engaged with the bearing holder 42 (fitting hole 42c) so that the bearing holder 42 and the stator core are integrated. 21 may be fixed.

  -In this embodiment, although the worm housing 54 and the stator core 21 were unevenly fitted via the pin 71, it is not restricted to this. For example, a worm housing (a portion corresponding to the fitting portion 72) in which the worm housing 54 and the pin 71 are integrally provided is engaged with the stator core 21 (fitting hole 26) so that the worm housing 54 and The stator core 21 may be fixed. In addition, the stator core (the portion corresponding to the fitting portion 73) in which the stator core 21 and the pin 71 are integrally provided is engaged with the worm housing 54 (fitting hole 54b) so that the worm housing 54 and the stator core are integrated. 21 may be fixed.

  In the present embodiment, the rotation shaft 11 is fixed to the worm shaft 51 so as to be integrally rotatable by inserting the rotation shaft 11 into the recess 51 a provided in the worm shaft 51, but the present invention is not limited to this. For example, the rotary shaft 11 and the worm shaft 51 may be fixed so as to be integrally rotatable by inserting the worm shaft 51 into a recess provided in the rotary shaft 11. That is, as long as the rotating shaft 11 and the worm shaft 51 are fixed so as to be integrally rotatable, the rotating shaft 11 and the worm shaft 51 may be fixed by any fixing method.

  DESCRIPTION OF SYMBOLS 10 ... Motor (motor apparatus), 11 ... Rotating shaft, 20 ... Stator, 21 ... Stator core, 21a ... Split stator core, 22 ... Yoke, 22a ... Split yoke, 23 ... Teeth, 23a ... Split yoke, 24 ... Coil, 25, 26 ... fitting hole, 30 ... rotor, 31 ... rotor core, 32 ... magnet, 41 ... bearing (first bearing), 42 ... bearing holder (bearing holding part), 42a ... cylindrical part, 42b ... flange part, 42c ... Fitting hole (first hole), 43 ... bearing (second bearing), 44 ... bearing, 50 ... speed reduction mechanism, 51 ... worm shaft, 51a ... recess, 51b ... reduced diameter portion, 52 ... worm wheel, 53 ... Worm gear, 54 ... Worm housing (reduction gear housing), 54a ... Housing hole, 54b ... Fitting hole (second hole), 60 ... ECU, 70 ... (First positioning part), 71 ... pin (second positioning part), 72, 73 ... fitting part, 74 ... flange part, 75 ... elastic body, 80 ... resin, L ... loss torque, M ... magnetic flux, S: Stress.

Claims (8)

A rotor fixed to the rotating shaft;
A stator disposed with a gap around the outer periphery of the rotor;
A bearing holding portion fitted to an outer peripheral surface of a first bearing provided at a first end of the rotating shaft;
A reduction gear housing having a holding hole in which a second bearing provided at a second end of the rotating shaft is fitted;
A first positioning portion for fixing the bearing holding portion and the stator using a concave-convex fitting;
A motor device comprising: a second positioning portion that fixes the stator and the speed reducer housing using concave and convex fitting. The motor device according to claim 1,
The stator has fitting holes provided at both ends in the direction along the rotation axis of the yoke,
The bearing holding portion has a first hole provided in a portion facing the stator in a direction along the rotation axis,
The speed reducer housing has a second hole provided in a portion facing the stator in a direction along the rotation axis;
The first positioning part is inserted into the fitting hole and the first hole part,
The second positioning portion is a motor device that is inserted into the fitting hole and the second hole portion. The motor device according to claim 1 or 2,
A motor device in which a plurality of the first positioning portions and the second positioning portions are provided in a circumferential direction of the stator. The motor apparatus as described in any one of Claims 1-3 WHEREIN:
The stator includes a stator, a stator core including a yoke, teeth projecting radially inward of the yoke, and a coil wound around the teeth.
The stator core is composed of a plurality of divided stator cores divided in the circumferential direction,
The first positioning portion and the second positioning portion are motor devices provided respectively corresponding to the split yokes of the split stator core. The motor apparatus as described in any one of Claims 1-4 WHEREIN:
The stator includes a stator, a stator core including a yoke, teeth projecting radially inward of the yoke, and a coil wound around the teeth.
In the circumferential direction of the yoke, a motor device provided with fitting holes corresponding to the first positioning portion and the second positioning portion in a portion facing the teeth and a central portion in the radial direction of the yoke. . In the motor apparatus as described in any one of Claims 1-5,
A motor device in which the second positioning portion is unevenly fitted in a fitting hole provided in the speed reducer housing via an elastic body. In the motor apparatus as described in any one of Claims 1-6,
The motor device in which the first positioning unit and the second positioning unit are pins. In the motor device according to any one of claims 1 to 7,
A motor device in which an outer peripheral surface between the bearing holding portion and the reduction gear housing is covered with a film-like resin.

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