WO2021186973A1

WO2021186973A1 - Motor device

Info

Publication number: WO2021186973A1
Application number: PCT/JP2021/005249
Authority: WO
Inventors: 雄太郎城; 吉田　靖
Original assignee: 株式会社ミツバ
Priority date: 2020-03-19
Filing date: 2021-02-12
Publication date: 2021-09-23
Also published as: JP7489796B2; JP2021151104A

Abstract

The present invention improves the compactness and increases the performance of a motor device. This motor device has: a ring-shaped stator; a coil wound around the stator; a rotor shaft 27 which rotates around a rotational axis 31 and is provided on the inside of the stator in the radial direction thereof; a rotor core 22 which is secured to the rotor shaft 27, is equipped with a through hole 22e passing therethrough along the rotational axis 31, and is radially centered around said rotational axis 31; and a magnet 23 provided to the outer-circumferential surface of the rotor core 22. The rotor core 22 is equipped with a securing part 22a to be secured to the rotor shaft 27, and a holding part 22b for holding the magnet 23, and the through hole 22e includes a first through hole 22f and a second through hole 22g. The rotor shaft 27 is positioned in the first through hole 22f and not in the second through hole 22g. The securing part 22a and the holding part 22b are provided in positions which do not overlap one another in the direction of the rotational axis 31.

Description

Motor device

The present invention relates to a miniaturized motor device.

Motor devices used as drive sources for sunroof devices mounted on vehicles such as automobiles are arranged in narrow spaces such as inside the doors and ceilings of vehicles, so it is desirable that they be miniaturized. Therefore, in order to make the motor device smaller, for example, it has been devised to make a part of the shaft of the motor device thinner.

As a miniaturized motor device, for example, Patent Document 1 describes a motor having a shaft structure having a different thickness and integrally provided with a first shaft portion and a second shaft portion. The device is shown.

Japanese Unexamined Patent Publication No. 2019-140849

However, since the shaft of the motor device described in Patent Document 1 includes a thick portion and a thin portion, the coaxiality between the thick portion and the thin portion may deteriorate, and the runout due to rotation may also increase. There is sex. Further, since the rotor core is fixed to the shaft, the coaxiality and vibration of the rotor core are added, and there is a possibility that the sound and vibration become loud.

An object of the present invention is to provide a miniaturized motor device while improving performance.

One aspect of the present invention is an annular stator, a coil wound around the stator, a shaft provided inside the stator in the radial direction and rotating around the rotation axis, and fixed to the shaft. It is provided with a through hole penetrating along the rotation axis, and further has a holding member centered on the rotation axis in the radial direction, and a magnet provided on the outer peripheral surface of the holding member. Further, the holding member is a pressure member provided with a fixing portion to be press-fitted into the shaft and a holding portion for holding the magnet, and the through hole is a first through hole provided in the fixing portion. The shaft is arranged in the first through hole and is not arranged in the second through hole, including the second through hole provided in the holding portion, and the fixing portion and the holding portion. Are provided at positions that do not overlap in the direction along the rotation axis.

In another aspect of the present invention, the holding member is a forged member.

In another aspect of the present invention, a cylindrical cover is provided to cover the magnet, and the end of the cover is fixed to the fixing portion of the cover.

Further, in another aspect of the present invention, the fixing portion includes a portion in which the radial thickness of the fixing portion is thicker than the radial thickness of the holding portion.

According to the present invention, it is possible to reduce the size of a motor device while improving its performance.

It is the schematic which shows the sunroof device mounted on the roof of a vehicle. It is a perspective view of the sunroof motor (motor device) of Embodiment 1 of this invention. It is a perspective view which shows the meshing state of the worm formed on the shaft of the motor apparatus shown in FIG. 2 and a worm wheel. It is sectional drawing which follows the AA line of FIG. It is an exploded perspective view of the rotor core unit of the motor apparatus shown in FIG. It is a perspective view of the rotor core shown in FIG. (A) and (b) are a cross-sectional view and a partial cross-sectional view of the rotor core unit shown in FIG. 5 along the axial direction. It is a figure which shows the variation of the rotor core unit of the motor apparatus shown in FIG. 2, (a) is a low torque type rotor core unit, (b) is a high torque type rotor core unit. FIG. 5 is an exploded perspective view of the rotor core unit of the motor device shown in FIG. 2 as viewed from the magnet cover side. It is a partial perspective view which shows the fixed state of the magnet cover in the motor apparatus shown in FIG. It is an external view which looked at the fixed state of the magnet cover shown in FIG. 10 from the rear side. It is a perspective view which shows the mounting state of the magnet in the rotor core unit of the motor apparatus shown in FIG. It is an external view of the rotor core unit of Embodiment 2 of this invention. It is an exploded perspective view of the rotor core unit shown in FIG. (A) and (b) are a cross-sectional view and a partial cross-sectional view of the rotor core unit shown in FIG. 14 along the axial direction.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

(Embodiment 1)
First, a sunroof device on which the motor device of the first embodiment is mounted will be described. As shown in FIG. 1, the sunroof device 10 includes a roof panel 11. The roof panel 11 opens and closes the opening 14 formed in the roof 13 of the vehicle 12. A pair of

shoes

15a and 15b are fixed to both sides of the roof panel 11 along the vehicle width direction (vertical direction in the drawing). Further, guide rails 16 extending in the front-rear direction (left-right direction in the drawing) of the vehicle 12 are fixed on both sides of the opening 14 of the roof 13 along the vehicle width direction. The pair of

shoes

15a and 15b are guided by the corresponding pair of guide rails 16, so that the roof panel 11 can be moved in the front-rear direction of the vehicle 12, that is, can be opened and closed.

One ends of the

drive cables

17a and 17b with gears are connected to each of the shoes 15b arranged on the rear side (right side in the figure) of the vehicle 12. The other ends of these

drive cables

17a and 17b are routed to the front side (left side in the drawing) of the vehicle 12 with respect to the opening 14.

A sunroof motor (motor device) 20 is mounted inside the roof 13 arranged between the opening 14 and the windshield 18 on the front side of the vehicle 12. The other ends of the pair of

drive cables

17a and 17b are meshed with the output gear 42b provided on the sunroof motor 20. Here, when the sunroof motor 20 is driven, the pair of

shoes

15a and 15b are moved in opposite directions as the output gear 42b rotates. As a result, the roof panel 11 is pushed and pulled by the pair of

drive cables

17a and 17b via the pair of shoes 15b, whereby the roof panel 11 is automatically opened and closed.

Next, the sunroof motor 20 of the first embodiment will be described. In the following description, the term "axial direction" refers to the direction of the rotation axis of the shaft of the motor unit, the term "circumferential direction" refers to the circumferential direction of the shaft, and the term "diameter direction" refers to the direction of the shaft. It shall refer to the radial direction.

As shown in FIG. 2, the sunroof motor 20 has a motor portion 21 and a gear portion 40. The motor unit 21 is provided inside the annular stator 29 shown in FIG. 4, the coil 28 wound around the stator 29, and the stator 29 in the radial direction, and rotates around the rotation axis 31 shown in FIG. It has a rotor shaft (shaft) 27 and. Further, the motor unit 21 is fixed to the rotor shaft 27, has a through hole 22e penetrating along the rotation axis 31, and has a rotor core (holding member) 22 centered on the rotation axis 31 in the radial direction, and a rotor core. It has

magnets

23a, 23b, 23c, 23d shown in FIG. 4 provided on the outer peripheral surface of 22.

In the sunroof motor 20, the magnet 23 is provided on the outer peripheral surface of the rotor core 22 in a state of being divided into four parts. That is, on the outer peripheral surface of the rotor core 22,

magnets

23a, 23b, 23c, 23d are provided along the circumferential direction thereof.

Further, as shown in FIG. 3, the rotor shaft 27 is rotatably supported by a ball bearing 44. Then, the rotor core 22 is fixed to the rotor shaft 27. Specifically, the rotor core 22 and the rotor shaft 27 are fixed by press fitting.

Further, as shown in FIG. 4, the stator 29 includes a plurality of teeth 30 projecting radially inward from the inner peripheral surface of the stator 29, and a coil 28 is wound around each of the plurality of teeth 30. Has been done.

Next, as shown in FIG. 2, the gear portion 40 is provided with a gear case 41. The opening portion of the gear case 41 is closed by a gear cover (not shown). This gear cover is formed in a substantially flat plate shape by a resin material such as plastic, and can be easily attached to the gear case 41 by a so-called snap-fit engagement structure.

Further, the gear case 41 is provided with a worm wheel accommodating portion 41a. The worm wheel accommodating portion 41a is provided so as to be recessed in the thickness direction of the gear case 41 and on the side opposite to the gear cover side. A worm wheel 42 forming a deceleration mechanism is rotatably housed in the worm wheel accommodating portion 41a.

The worm wheel 42 is formed of a resin material such as plastic in a substantially disk shape, and a worm provided on the worm shaft 43 formed in succession with the rotor shaft 27 is provided on the outer side in the radial direction thereof, as shown in FIG. A tooth portion 42a to which 43a is engaged is formed. Further, the axial base end side of the output gear 42b is fixed to the rotation center of the worm wheel 42. Here, the output gear 42b is made of steel, and its axial intermediate portion is rotatably supported by the boss portion of the gear case 41 shown in FIG. The axial tip side of the output gear 42b extends to the outside of the gear case 41, whereby the other ends of the pair of

drive cables

17a and 17b are engaged with the tip end side of the output gear 42b (FIG. FIG. 1).

As shown in FIG. 5, the motor unit 21 of the first embodiment includes a rotor core 22, four

magnets

23a, 23b, 23c, 23d, a magnet holder 24, and a magnet cover (cover) as the magnet unit 26. 25 and are provided.

Here, the rotor core 22 of the first embodiment will be described. The rotor core 22 of the first embodiment shown in FIG. 6 is an annular member formed by heading, and includes a through hole 22e penetrating along the rotation axis 31. Then, as shown in FIG. 7A, the rotor core 22 has an annular fixing portion 22a, which is a portion fixed to the rotor shaft 27 by press fitting, and four

magnets

23a, 23b, 23c, 23d (see FIG. 5). It is provided with an annular holding portion 22b which is a portion for holding the above. The through hole 22e includes a first through hole 22f provided in the fixing portion 22a and a second through hole 22g communicating with the first through hole 22f and provided in the holding portion 22b.

Then, the fixing portion 22a and the holding portion 22b are integrated. The rotor shaft 27 is arranged in the first through hole 22f, but is not arranged in the second through hole 22g. Further, the fixing portion 22a and the holding portion 22b are provided at positions where they do not overlap with each other in the direction along the rotation axis 31 of the rotor core 22. Here, the press-fitting of the rotor shaft 27 is performed only on the fixed portion 22a. That is, as shown in FIG. 7B, the rotor shaft 27 penetrates to the end of the first through hole 22f of the fixing portion 22a (the boundary portion with the second through hole 22g), but the holding portion 22b It does not enter the second through hole 22g. That is, it does not enter the region of the holding portion 22b of the rotor core 22. Therefore, the space directly below the holding portion 22b of the rotor core 22 is hollow.

Further, the fixing portion 22a of the rotor core 22 includes a portion in which the radial thickness of the fixing portion 22a is thicker than the radial thickness of the holding portion 22b. Specifically, the fixing portion 22a includes a flange portion 22c whose radial thickness is thicker than the radial thickness of the holding portion 22b. That is, as shown in FIG. 7B, the radial thickness T1 of the flange portion 22c in the fixing portion 22a is larger than the radial thickness T2 of the holding portion 22b (T1> T2).

The fixing portion 22a of the rotor core 22 is formed by collecting excess meat when the rotor core 22 is formed by heading, and at that time, the flange portion 22c which is a thick portion is formed by collecting more excess meat. do. Further, as shown in FIG. 6, on the outer peripheral surface of the holding portion 22b of the rotor core 22, each of the four

magnets

23a, 23b, 23c, 23d shown in FIG. 5 is evenly divided into four regions in the circumferential direction and positioned. Four elongated ribbed protrusions 22d are formed at equal intervals. As a result, each of the four

magnets

23a, 23b, 23c, and 23d is arranged on the outer peripheral surface of the holding portion 22b at equal intervals and positioned in the circumferential direction of the holding portion 22b.

Further, the flange portion 22c of the rotor core 22 also has a function of positioning the rotor shaft 27 side in the direction along the rotation axis 31 of each end of the four

magnets

23a, 23b, 23c, 23d.

On the other hand, a magnet holder 24 is provided as a member for holding the ends of the four

magnets

23a, 23b, 23c, and 23d on the side opposite to the rotor shaft 27 side in the direction along the rotation axis 31 of each. That is, each of the four

magnets

23a, 23b, 23c, and 23d is sandwiched and held by the flange portion 22c of the rotor core 22 and the magnet holder 24 on the outer peripheral surface of the rotor core 22.

Further, the four

magnets

23a, 23b, 23c, and 23d are covered with a cylindrical (cylindrical) magnet cover 25. Then, as shown in FIG. 10 described later, the magnet cover 25 has an protruding portion 25a, which is an end portion thereof, fixed to the flange portion 22c of the fixing portion 22a. As a result, it is possible to prevent the four

magnets

23a, 23b, 23c, and 23d from falling off from the rotor core 22.

In the sunroof motor 20 of the first embodiment, since the rotor shaft 27 is press-fitted only into the first through hole 22f of the fixing portion 22a of the rotor core 22 formed by pressure fabrication, a thin portion can be formed on the rotor shaft 27. The rotor shaft 27 can be made into a straight shape. As a result, the rotor shaft 27 can be shortened. That is, since the rotor shaft 27 can be shortened, the sunroof motor 20 can be made smaller and lighter.

Further, since the rotor shaft 27 has a straight shape and does not require a thin portion, a shaft having a stepped structure having a thick portion and a thin portion is not adopted. Therefore, it is possible to prevent the deterioration of the coaxiality and the deterioration of the runout due to the rotation that occur in the case of the shaft having the stepped structure. That is, in the sunroof motor 20, by making the rotor shaft 27 a straight shape and shortening the shaft, the coaxiality between the rotor shaft 27 and the rotor core 22 can be increased, and the magnitude of shaft runout due to rotation is reduced. can do.

Thereby, it is possible to reduce the size and weight while improving the performance of the sunroof motor 20 of the first embodiment.

Further, since the rotor shaft 27 can be shortened, the material cost can be reduced and the cost of the sunroof motor 20 can be reduced.

Further, as shown in FIG. 7B, the press-fitting of the rotor shaft 27 into the rotor core 22 is completed by the first through hole 22f of the fixing portion 22a of the rotor core 22. That is, the rotor shaft 27 is arranged directly below the fixed portion 22a of the rotor core 22, but the rotor shaft 27 is not arranged directly below the holding portion 22b of the rotor core 22. As a result, the space directly below the holding portion 22b has a hollow structure. Since the fixing portion 22a includes a flange portion 22c which is a thick portion formed by collecting excess meat during pressing, no pressure is applied to the inside of the magnet 23 when the rotor shaft 27 is press-fitted. As a result, the influence of the rotor shaft 27 on the magnet 23 at the time of press fitting can be reduced, and the magnet 23 can be prevented from being deformed or cracked.

The press-fitting position of the rotor shaft 27 is determined by the position of the jig to be press-fitted from the opposite side at the time of press-fitting. That is, the jig is inserted into the rotor core 22 from the opening on the side opposite to the pressure inlet of the rotor shaft 27, and the jig is inserted up to the boundary portion between the holding portion 22b and the fixing portion 22a. Then, when the rotor shaft 27 is press-fitted, the rotor shaft 27 is press-fitted until the rotor shaft 27 abuts on the jig.

As a result, the press-fitting position of the rotor shaft 27 can be easily determined, and the press-fitting position can be easily managed.

Further, in the rotor core 22, the fixing portion 22a and the end face of the rotor core 22 which are the press-fitting points are machined, whereby the press-fitting accuracy can be ensured. The press-fitting portion of the rotor shaft 27 may be knurled to prevent the rotor shaft 27 from coming off or rotating.

Further, as shown in FIG. 8, the sunroof is simply changed from the length D shown in FIG. 8 (a) to the length D + α shown in FIG. 8 (b) by changing the length of the rotor core 22 (magnet 23). The performance of the motor 20 can be changed. For example, when the length of the rotor core 22 is the length D shown in FIG. 8 (a), the motor device is a low torque type, while the length of the rotor core 22 is the length D + α shown in FIG. 8 (b). In this case, it becomes a high torque type motor device. That is, it is possible to correspond to the variation of the characteristics of the motor device only by changing the length of the magnet 23.

Further, in the magnet unit 26 shown in FIG. 9, the four

magnets

23a, 23b, 23c, and 23d are provided on the outer peripheral surface of the holding portion 22b of the rotor core 22 and are covered with the cylindrical magnet cover 25. .. In other words, the four

magnets

23a, 23b, 23c, 23d are housed in the cylindrical magnet cover 25. Specifically, each of the four

magnets

23a, 23b, 23c, 23d is attached to the outer peripheral surface of the holding portion 22b of the rotor core 22, and further, the outer peripheral portions of the

magnets

23a, 23b, 23c, 23d, respectively. Is covered with a cylindrical magnet cover 25.

This makes it possible to prevent the

magnets

23a, 23b, 23c, and 23d from peeling off from the rotor core 22.

As shown in the P portion of FIG. 10, the magnet cover 25 is attached to the flange portion 22c by caulking a plurality of protruding portions 25a provided at the end portions to the flange portion 22c of the rotor core 22. Has been done. At that time, the outer diameter of the flange portion 22c is larger than the outer diameter of the magnet 23. Therefore, even when the magnet cover 25 is fixed to the flange portion 22c by caulking, the caulking load is received by the flange portion 22c of the fixing portion 22a of the rotor core 22, so that stress is generated on the magnet 23 in the magnet cover 25. It is possible to prevent the magnet 23 from cracking.

Here, in the magnet cover 25, the fixing portion to the flange portion 22c is not limited to the protruding portion 25a, but is, for example, a fixing portion provided over the entire circumference of the end portion of the cylindrical magnet cover 25. In that case, the flange portion 22c can be fixed by rolling caulking.

Further, since one end of the magnet 23 is supported by the flange portion 22c of the fixing portion 22a of the rotor core 22, only one magnet holder 24 is required to support the other end of the magnet 23, and the number of parts can be reduced.

Further, in the sunroof motor 20 of the first embodiment, the magnet cover 25 is fixed by mechanical fixing by caulking instead of fixing by using an adhesive. In the case of fixing with an adhesive, the curing time of the adhesive and the curing furnace are required. However, according to the method of fixing the magnet cover 25 of the first embodiment, since the machine is fixed by caulking, the process can be simplified by shortening the time and the capital investment can be suppressed.

Further, as shown in FIG. 9, four convex portions 24a are provided on the back surface side of the magnet holder 24 at equal intervals with respect to the circumferential direction of the rotation axis 31. The four protrusions 24b are provided on the surface opposite to the surface on which the four protrusions 24a are provided at equal intervals with respect to the circumferential direction of the rotation axis 31. These four protrusions 24b are provided so as to be arranged at the same positions as the four protrusions 22d provided on the holding portion 22b of the rotor core 22 with respect to the circumferential direction of the rotation axis 31.

Further, four notched portions 25b are provided on the surface of the end portion of the magnet cover 25 opposite to the end portion provided with the protruding portion 25a. These four notches 25b are provided at equal intervals with respect to the circumferential direction of the rotation axis 31, and are arranged at the same positions as the four convex portions 24a of the magnet holder 24 with respect to the circumferential direction of the rotation axis 31. It is provided so that it can be done.

As a result, as shown in FIG. 11, when the magnet cover 25 is attached, the four convex portions 24a of the magnet holder 24 and the four notched portions 25b of the magnet cover 25 are engaged with each other, and the magnet cover 25 is positioned. .. As a result, the subsequent magnet assembly can be easily performed. Further, as shown in FIG. 12, each of the four

magnets

23a, 23b, 23c, and 23d is positioned with respect to the circumferential direction of the rotor core 22 by the protrusion 22d of the rotor core 22 and the protrusion 24b of the magnet holder 24. , The convex portion 24a of the magnet holder 24 and the central portion of each magnet 23 are at the same position. As a result, the convex portion 24a of the magnet holder 24 can be used for positioning in the magnetizing process.

Further, as shown in the Q portion of FIG. 12, the corner portions of each magnet 23 have an R shape. As a result, even when the caulking load when fixing the magnet cover 25 by caulking is applied to the magnet 23, the caulking load is not applied to the corners of the magnet 23, so that the corners of the magnet 23 are prevented from cracking. be able to.

Further, when the magnet unit 26 shown in FIG. 9 is conveyed, it can be chucked to the flange portion 22c of the rotor core 22. As a result, it is not necessary to apply a load to the magnet 23 or the like during transportation, so that cracking or chipping of the magnet 23 can be suppressed.

In the sunroof motor 20 of the first embodiment, as shown in FIG. 4, the cross-sectional shape of the stator 29 is substantially hexagonal. As a result, the thickness L of the stator 29 can be reduced as compared with the case where the cross-sectional shape is circular. That is, by reducing the thickness of the stator 29, the sunroof motor 20 can be made thinner. Since it is important to reduce the thickness of the sunroof motor 20 in the vehicle portion to which the sunroof device 10 shown in FIG. 1 is attached, the sunroof motor 20 of the first embodiment is assembled to the sunroof device 10. Very effective.

Next, the operation of the sunroof motor 20 will be described.

In the sunroof motor 20, the electric power supplied from the outside to the controller board (not shown) via the terminal 32 shown in FIG. 2 is selectively supplied to each coil 28 of the motor unit 21 shown in FIG. Then, a predetermined interlinkage magnetic flux is formed on the stator 29 (teeth 30), and a magnetic attraction force or a repulsive force is formed between the interlinkage magnetic flux and the effective magnetic flux formed by the magnet 23 provided on the rotor core 22. Occurs. As a result, the rotor core 22 continuously rotates.

Then, when the rotor core 22 rotates, the worm shaft 43 integrated with the rotor shaft 27 shown in FIG. 3 rotates, and further, the worm wheel 42 meshing with the worm shaft 43 rotates. Then, the output gear 42b connected to the worm wheel 42 rotates, and a desired electrical component or the like can be driven.

Further, the motor portion 21 has a structure in which

magnets

23a, 23b, 23c, and 23d are arranged on the outer peripheral surface of the holding portion 22b of the rotor core 22. Therefore, the inductance value in the d-axis direction, which is the direction of the magnetic flux of the magnet 23, can be reduced.

The outer peripheral surface of the holding portion 22b of the rotor core 22 is provided with four protrusions 22d at equal intervals in the circumferential direction. The protrusion 22d is formed so as to project outward in the radial direction and extend in the entire axial direction of the rotor core 22. It is preferable that each of the four protrusions 22d has a width dimension in the circumferential direction at the outer end in the radial direction set to 20 ° or more and 40 ° or less in the electric angle θ. By setting the width dimension of the protrusion 22d in the circumferential direction to 40 ° or less in the electric angle θ in this way, the inductance value in the q-axis direction magnetically orthogonal to the d-axis can be reduced. As a result, a demagnetizing field can be suppressed and a high reluctance torque can be obtained.

(Embodiment 2)
The rotor core unit of the second embodiment will be described. As shown in FIG. 14, the rotor core unit of the second embodiment is provided with a rotor core 22, four

magnets

23a, 23b, 23c, 23d, and a magnet cover (cover) 25 as a magnet unit 26. ing. The difference from the magnet unit 26 of the first embodiment is that it does not have the magnet holder 24 as shown in FIG.

As a result, the number of parts in the magnet unit 26 can be reduced, and the assembly of the magnet unit 26 can be facilitated and the cost can be reduced.

Further, in the second embodiment, as shown in FIG. 14, a fixed portion of the rotor core 22 to the flange portion 22c of the magnet cover 25 is provided over the entire circumference of the end portion of the cylindrical magnet cover 25. The caulking portion is 25c. As a result, by performing rolling caulking on the flange portion 22c, as shown in FIG. 13, the caulking portion 25c of the magnet cover 25 can be fixed over the entire circumference of the flange portion 22c, and the magnet cover 25 can be fixed. The joint strength can be increased to the flange portion 22c.

Further, the rotor core 22 of the second embodiment has substantially the same structure as the rotor core 22 of the first embodiment, but as shown in FIGS. 15A and 15B, the second through hole 22g of the rotor core 22 The portion forming the above is the thin portion 22h. Specifically, in the through hole 22e provided in the rotor core 22, as shown in FIG. 15B, the diameter Φ2 of the second through hole 22g is larger than the diameter Φ1 of the first through hole 22f. (Φ1 <Φ2). That is, the inner peripheral wall of the through hole 22e of the rotor core 22 has a stepped structure, and the wall thickness of the region of the holding portion 22b of the rotor core 22 is thinner than the wall thickness of the region of the fixed portion 22a. Therefore, the diameter Φ2 of the second through hole 22g in the region of the holding portion 22b is larger than the diameter Φ1 of the first through hole 22f in the region of the fixing portion 22a.

This makes it possible to assemble the rotor shaft 27 from the side opposite to the press-fitting side of the rotor shaft 27 when assembling the rotor shaft 27 to the rotor core 22. That is, the rotor shaft 27 can be press-fitted into the first through hole 22f through the rotor shaft 27 from the end opening side of the second through hole 22g while using the second through hole 22g as a guide. As a result, a jig or the like is not required when the rotor shaft 27 is press-fitted, and the press-fitting process of the rotor shaft 27 can be facilitated as compared with the first embodiment.

Regarding the other structures of each member of the rotor core unit of the second embodiment (rotor core 22, four

magnets

23a, 23b, 23c, 23d and the magnet cover 25), each member of the rotor core unit of the first embodiment Since each structure is the same, the duplicate description will be omitted.

It goes without saying that the present invention is not limited to the above-described embodiment and can be variously modified without departing from the gist thereof. For example, in the above embodiment, the case where the cross-sectional shape of the stator 29 incorporated in the sunroof motor 20 is substantially hexagonal has been taken up, but the cross-sectional shape of the stator 29 may be circular.

10 Sunroof device 11 Roof panel 12 Vehicle 13 Roof 14

Opening

15a, 15b Shoe 16

Guide rail

17a, 17b Drive cable 18 Windshield 20 Sunroof motor (motor device)
21 Motor part 22 Rotor core (holding member)

22a Fixing part

22b Holding part

22c Flange part 22d Protrusion 22e Through hole 22f First through hole 22g Second through hole 22h

Thin part

23, 23a, 23b, 23c, 23d Magnet 24 Magnet holder 24a Convex part 24b Protrusion part 25 Magnet cover ( cover)
25a Overhang (end)
25b Notch 25c Caulking (end)
26 Magnet unit 27 Rotor shaft (shaft)
28 Coil 29 Stator 30 Teeth 31 Rotating axis 32 Terminal 40 Gear part 41 Gear case 41a Warm wheel accommodating part 42 Warm wheel

42a Tooth part

42b Output gear 43 Warm shaft 43a Warm 44 Ball bearing

Claims

With an annular stator,
The coil wound around the stator and
A shaft provided inside the stator in the radial direction and rotating around the axis of rotation,
A holding member fixed to the shaft, provided with a through hole penetrating along the rotation axis, and having the rotation axis as the radial center.
A magnet provided on the outer peripheral surface of the holding member and
Have,
The holding member includes a fixing portion that is press-fitted into the shaft and a holding portion that holds the magnet.
The through hole includes a first through hole provided in the fixing portion and a second through hole provided in the holding portion.
The shaft is arranged in the first through hole and is not arranged in the second through hole.
A motor device characterized in that the fixed portion and the holding portion are provided at positions where they do not overlap in a direction along the rotation axis.
The motor device according to claim 1, wherein the holding member is a pressure member.
The motor device according to claim 1 or 2.
A cylindrical cover is provided to cover the magnet.
The cover is a motor device in which an end portion of the cover is fixed to the fixed portion.
The method according to any one of claims 1 to 3, wherein the fixed portion includes a portion in which the radial thickness of the fixed portion is thicker than the radial thickness of the holding portion. Motor device.