WO2020195400A1

WO2020195400A1 - Motor

Info

Publication number: WO2020195400A1
Application number: PCT/JP2020/006707
Authority: WO
Inventors: 瑞貴仁平; 梅田　智之; 藤原　英雄
Original assignee: 日本電産株式会社
Priority date: 2019-03-28
Filing date: 2020-02-20
Publication date: 2020-10-01
Also published as: CN113424409A

Abstract

One embodiment of the motor according to the present invention is provided with: a rotor rotating about the central axis; a stator facing the rotor in the radial direction and having a stator core; a housing comprising a resin and having the stator embedded therein; and a fastened component to which a fastening member is fastened. The fastened component is embedded in the housing in a state of making contact with the stator core.

Description

motor

The present invention relates to a motor.

In recent years, motors in which the stator is molded with resin have been developed for the purpose of simplifying the assembly process. In the motor of Patent Document 1, the resin portion that molds the stator constitutes the housing.

Japanese Publication: Japanese Patent Application Laid-Open No. 2010-22191

The housing of Patent Document 1 is provided with a hole to which a bolt is fastened to attach the motor to the device to be attached. In such a motor, in order to obtain a sufficient fastening force by bolts, it is conceivable to adopt a structure in which a nut is embedded inside the housing. In this case, the nut is held by a housing that is a resin material. For this reason, the vibration generated from the rotor, which is a rotating portion, does not easily escape from the fastening portion to the device, and the motor itself easily resonates.

In view of the above circumstances, one of the objects of the present invention is to provide a motor that does not easily resonate.

In one aspect of the motor of the present invention, a rotor that rotates around a central axis, a stator that is radially opposed to the rotor and has a stator core, a housing that is made of resin and in which the stator is embedded, and a fastening member are fastened. It is provided with a fastener to be fastened. The fastener to be fastened is embedded in the housing in contact with the stator core.

According to one aspect of the present invention, a motor that does not easily resonate is provided.

FIG. 1 is a cross-sectional view of the motor of one embodiment. FIG. 2 is a plan view of the motor of one embodiment. FIG. 3 is a partial cross-sectional view of the motor along lines III-III of FIG. FIG. 4 is a partial cross-sectional view of the motor of the modified example 1. FIG. 5 is a cross-sectional view of the motor along the VV line of FIG. FIG. 6 is a partial cross-sectional view of the motor of the modified example 2. FIG. 7 is a cross-sectional view of the motor along lines VII-VII of FIG. FIG. 8 is a partial cross-sectional view of the motor of the modified example 3. FIG. 9 is a cross-sectional view of the motor taken along the line IX-IX of FIG.

Hereinafter, embodiments to which the present invention has been applied will be described in detail with reference to the drawings.
In the following description, the direction parallel to the central axis J (see FIG. 1) is simply referred to as "axial direction" or "vertical direction", and the radial direction centered on the central axis J is simply referred to as "radial direction". The circumferential direction around the axis J, that is, the circumference of the central axis J is simply referred to as the "circumferential direction". Further, in the present specification, one side in the axial direction along the central axis J is simply referred to as "upper side", and the other side is simply referred to as "lower side". It should be noted that the vertical direction in the present specification is merely a direction used for explanation, and does not limit the posture during use and distribution of the motor.

FIG. 1 is a cross-sectional view of the motor 1 of one embodiment. FIG. 2 is a plan view of the motor 1. Note that the rotor 10 is not shown in FIG.

As shown by a virtual line (dashed line) in FIG. 1, the motor 1 is attached to an external device 9 arranged on the upper side of the motor 1 by using a fixing bolt (fastening member) 9e. The motor 1 transmits power to the external device 9.
The motor 1 includes a rotor 10, a stator 20 surrounding the rotor 10, an upper bearing 15 and a lower bearing 16 that rotatably hold the rotor 10, an upper bearing holder 40 that holds the upper bearing 15, and a lower bearing 16. It has a lower bearing holder 70 for holding the bearing, a housing 30, a plurality of insert nuts (fastened fasteners) 50, and a plurality of bus bars 80.

The rotor 10 rotates about a central axis J extending in the vertical direction. The rotor 10 has a shaft 11 extending along the central axis J, a rotor core 12, and a rotor magnet 13.

The shaft 11 is connected to the power transmission mechanism 9d of the external device 9 at the upper end portion (the end portion on one side in the axial direction). The shaft 11 is rotatably supported around the central axis J by the upper bearing 15. The rotor core 12 is fixed to the outer peripheral surface of the shaft 11. Further, the rotor magnet 13 is fixed to the outer peripheral surface of the rotor core 12. The plurality of rotor magnets 13 may be embedded inside the rotor core 12.

The upper bearing 15 is located above the stator 20, and the lower bearing 16 is located below the stator 20. The upper bearing 15 supports the upper end of the shaft 11, and the lower bearing 16 supports the lower end of the shaft 11. The upper bearing 15 and the lower bearing 16 of the present embodiment are ball bearings. However, the upper bearing 15 and the lower bearing 16 may be other types of bearings such as needle bearings.

The upper bearing holder 40 is located above the stator 20. The upper bearing holder 40 is made of metal. The upper bearing holder 40 has a holder cylinder portion 41, an upper plate portion 42 extending radially inward from the upper end of the holder cylinder portion 41, and a holder flange portion 43 extending radially outward from the lower end of the holder cylinder portion 41. ..

The holder cylinder portion 41 has a cylindrical shape centered on the central axis J. The upper bearing 15 is arranged inside the holder cylinder portion 41 in the radial direction. The upper plate portion 42 covers the upper side of the outer ring of the upper bearing 15. The upper plate portion 42 is provided with a central hole 42a penetrating in the axial direction. The shaft 11 is inserted through the central hole 42a. The radial outer end of the holder flange portion 43 is embedded in the housing 30. That is, at least a part of the upper bearing holder 40 is embedded in the housing 30.

The lower bearing holder 70 is located below the stator 20. The lower bearing holder 70 is made of resin. The lower bearing holder 70 has a disk shape when viewed from the axial direction. The lower bearing holder 70 is fixed to the housing 30 at the outer edge.

A central hole 72a is provided in the center of the lower bearing holder 70 when viewed from the axial direction. The lower end of the shaft 11 is inserted into the central hole 72a. An inner wall surface 71a that surrounds the lower bearing 16 from the outside in the radial direction and holds the lower bearing 16 is provided around the central hole 72a.

The stator 20 surrounds the rotor 10 from the outside in the radial direction. The stator 20 faces the rotor 10 in the radial direction. The stator 20 includes a stator core 21, an insulator 22, and a coil 29.

The stator core 21 has a tubular shape extending in the axial direction. The stator core 21 has an annular core back portion 21a centered on the central axis J and a plurality of tooth portions 21b extending radially inward from the core back portion 21a. A plurality of tooth portions 21b are provided at equal intervals in the circumferential direction around the central axis J.

The coil 29 is attached to the teeth portion 21b via the insulator 22. The end of the coil 29 is connected to a bus bar 80 located below the stator 20. The bus bar 80 is connected to a control device (not shown). Electric power is supplied to the coil 29 from the control device via the bus bar 80.

The housing 30 is made of a resin material. In the present specification, the resin material may be a composite material reinforced with a fiber material such as glass fiber or carbon fiber. That is, the housing 30 may be a fiber reinforced resin material.

A stator 20, a bus bar 80, an upper bearing holder 40, and an insert nut 50 are embedded in the housing 30. As a result, the housing 30 holds the bus bar 80, the stator 20, the upper bearing holder 40, and the insert nut 50. The housing 30 is manufactured by insert molding while holding the stator 20, the bus bar 80, the upper bearing holder 40, and the insert nut 50 in the mold. According to the present embodiment, since the housing 30 embeds the stator 20, the bus bar 80, the upper bearing holder 40, and the insert nut 50, the assembly process of each member can be simplified.

The housing 30 includes a main body 31 that holds the stator 20, an upper protruding portion 3 that is located above the main body 31, a bus bar holder 36 that holds the bus bar 80, and a lower portion that extends downward from the lower surface of the main body 31. It has a tubular portion 37, a plurality of projecting portions 39 projecting radially outward from the main body portion 31, and a holder holding portion 38 for holding the upper bearing holder 40.

The stator 20 is embedded in the main body 31. The main body 31 surrounds the upper side, the lower side, and the radial outer side with respect to the stator 20. The main body 31 surrounds the teeth portion 21b and the coil 29, and is also provided between the teeth portions 21b and the coil 29 that are adjacent to each other in the circumferential direction. Further, the main body 31 does not cover the inner peripheral surface of the stator core 21. Therefore, the inner peripheral surface of the stator core 21 is exposed from the housing 30.

The main body 31 has a plurality of openings 6. That is, the housing 30 has a plurality of openings 6. The plurality of openings 6 are traces of a support portion that supports the stator 20 in the mold when the housing 30 is molded. The plurality of openings 6 is a general term including a plurality of first openings 61, a plurality of second openings 62, and a plurality of third openings 63.

The upper protruding portion 3 is a general term for a plurality of ribs protruding upward from the upper surface of the main body portion 31. The upper protruding portion 3 extends in the circumferential direction and the radial direction to reinforce the housing 30.

The upper protruding portion 3 has an annular portion 32a attached to the external device 9. The annular portion 32a is located at the upper end portion of the upper protruding portion 3. The annular portion 32a has a cylindrical shape extending upward from the inner edge of the upper protruding portion 3.

The annular portion 32a is located on the radial outside of the first opening 61. The annular portion 32a is located radially inside the outer peripheral surface of the housing 30. The annular portion 32a is attached to the external device 9 and plays a part of the sealing function of the motor 1.

The external device 9 has a cylindrical holding cylinder portion 9a centered on the central axis J. The holding cylinder portion 9a surrounds the annular portion 32a from the outside in the radial direction. The inner diameter of the holding cylinder portion 9a is slightly larger than the outer diameter of the annular portion 32a. The tip surface of the holding cylinder portion 9a comes into contact with the upper end surface of the upper protruding portion 3.

A concave groove 9b extending along the circumferential direction is provided on the inner peripheral surface of the holding cylinder portion 9a. The sealing member 9c is housed in the groove 9b. The sealing member 9c is made of an elastic material such as rubber. The seal member 9c extends along the circumferential direction. In this embodiment, the seal member 9c is an O-ring. The seal member 9c is not limited to a member having a circular cross-sectional shape as long as it functions as a gasket.

The seal member 9c is sandwiched between the outer peripheral surface 32d of the annular portion 32a facing outward in the radial direction and the bottom surface of the concave groove 9b facing outward in the radial direction. By compressing the seal member 9c, it is possible to prevent moisture from entering the inside of the holding cylinder portion 9a.

The bus bar holder portion 36 is located on the lower surface of the main body portion 31. The housing 30 of the present embodiment is provided with two bus bar holder portions 36. Three bus bars 80 are embedded inside each bus bar holder portion 36. The bus bar 80 projects downward from the lower surface of the bus bar holder portion 36.

The lower cylinder portion 37 has a cylindrical shape centered on the central axis J. The outer peripheral surface of the lower cylinder portion 37 is continuous with the outer peripheral surface of the main body portion 31. The lower cylinder portion 37 surrounds the lower end portions of the plurality of bus bars 80 protruding from the housing 30 from the outside in the radial direction. Further, the lower cylinder portion 37 surrounds the plurality of second openings 62 and the plurality of third openings 63 from the outside in the radial direction.

A control device (not shown) for controlling the motor 1 is attached to the lower cylinder portion 37. Further, the bus bar 80 is connected to a socket portion (not shown) provided in the control device. The inner peripheral surface of the lower cylinder portion 37 and the control device are sealed by a seal structure (not shown). According to the present embodiment, the lower cylinder portion 37 having a sealing function surrounds the plurality of second openings 62 and the plurality of third openings 63 from the outside in the radial direction. Therefore, it is possible to prevent water from reaching the second opening 62 and the third opening 63.

The protruding portion 39 projects radially outward from the outer peripheral surface of the upper protruding portion 3 and the outer peripheral surface of the main body portion 31. The protruding shape of the protruding portion 39 is an arc shape along the outer peripheral surface 50c of the insert nut 50. The upper end surface of the protruding portion 39 is continuous with the upper end surface of the upper protruding portion 3. The insert nut 50 is embedded so as to straddle the upper protruding portion 3 and the protruding portion 39. As a result, the housing 30 holds the insert nut 50. A fixing bolt 9e for fixing the motor 1 to the external device 9 is fastened to the insert nut 50.

As shown in FIG. 2, the housing 30 of the present embodiment is provided with three protrusions 39. The three protrusions 39 are arranged at equal intervals along the circumferential direction. One insert nut 50 is embedded in each of the three protrusions 39.

As shown in FIG. 1, the insert nut 50 is a columnar shape extending along the center line J2. The center line J2 of the insert nut 50 is parallel to the center axis J of the motor 1. The insert nut 50 has an upper end surface (first end surface) 50a facing upward, a lower end surface (second end surface) 50b facing downward, and an outer peripheral surface 50c facing radially outward of the center line J2.

The insert nut 50 has a screw hole (fastened hole) 51 that opens in the upper end surface 50a and extends downward. The screw hole 51 extends in the axial direction about the center line J2. The inner peripheral surface of the screw hole 51 is exposed from the housing 30. The screw hole 51 is a female screw. The shaft portion of the fixing bolt 9e is inserted into the screw hole 51.

As shown in FIG. 1, the external device 9 has a plate-shaped fixing plate portion 9f extending radially outward from the lower end portion of the holding cylinder portion 9a. The external device 9 of the present embodiment has the same number of fixing plate portions 9f as the insert nuts 50 (three in the present embodiment). Each fixing plate portion 9f has a fixing hole 9g penetrating in the axial direction. A fixing bolt 9e is inserted into the fixing hole 9g from above. The motor 1 is fixed to the external device 9 by fastening the fixing bolt 9e to the screw hole 51 of the insert nut 50.

The upper end surface 50a of the insert nut 50 is arranged on the same plane as the upper end surface of the protruding portion 39. The lower end surface 50b of the insert nut 50 is arranged on the same plane as the lower end surface of the protrusion 39. The entire upper end surface 50a and a part of the lower end surface 50b of the insert nut 50 are exposed from the housing 30, respectively. On the other hand, the outer peripheral surface 50c of the insert nut 50 is embedded inside the housing 30. Therefore, the outer peripheral surface 50c comes into contact with the housing 30.

According to this embodiment, the insert nut 50 is embedded in the housing 30. The motor 1 is fixed to the external device 9 with the insert nut 50. Since there is no limitation on the material of the insert nut 50, a high-strength material (metal material in this embodiment) can be adopted. That is, the material of the insert nut 50 has a higher strength than the resin material of the housing 30. Therefore, as compared with the case where the external device 9 is directly fixed to the resin housing 30, it is possible to prevent damage to the fastening portion (screw hole in the present embodiment) due to stress at the time of fastening. Therefore, the fastening strength between the motor 1 and the housing 30 can be increased. Further, by increasing the fastening strength by one fixing bolt 9e, it is possible to reduce the number of fixing bolts 9e for obtaining a desired fixing strength, and it is possible to simplify the process of fixing the motor 1 to the external device 9. ..

The insert nut 50 is located on the upper side (one side in the axial direction) of the stator core 21. Further, the lower end surface 50b of the insert nut 50 comes into contact with the upper end surface 21c of the stator core 21. That is, the insert nut 50 is embedded in the housing 30 in contact with the stator core 21. Since the stator core 21 is made of metal, it is heavier and more rigid than the housing 30. According to this embodiment, the stator core 21 suppresses the vibration of the insert nut 50 by bringing the insert nut 50 into contact with the stator core 21. More specifically, the rigidity of the insert nut 50 is increased. As a result, the natural frequency of the motor 1 becomes sufficiently higher than the frequency of the vibration generated by the motor 1 as the rotor 10 rotates. Therefore, the motor 1 is unlikely to generate resonance due to the vibration generated by the motor 1. It should be noted that this can be suppressed.

FIG. 3 is a partial cross-sectional view of the motor 1 along the line III-III of FIG.
The insert nut 50 overlaps the stator core 21 when viewed from the axial direction. According to this embodiment, it is possible to prevent the insert nut 50 from protruding outward in the radial direction with respect to the outer shape of the motor 1. Therefore, the motor 1 can be miniaturized in the radial direction.

In the present embodiment, the lower end surface 50b of the insert nut 50 and the upper end surface 21c of the stator core 21 are preferably fixed by fixing means such as welding. By fixing the insert nut 50 to the stator core 21, the rigidity of the insert nut 50 can be further increased. As a result, the effect of suppressing the resonance of the motor 1 can be enhanced. Further, according to the present embodiment, the insert nut 50 is fixed to the stator core 21 and positioned with respect to the stator core 21 before molding the housing 30. Therefore, in the process of molding the housing 30, it is possible to prevent the insert nut 50 from being displaced due to the injection pressure of the resin, and it is possible to improve the positioning accuracy of the insert nut 50 with respect to the housing 30.
The means for fixing the insert nut 50 and the stator core 21 is not limited to welding the lower end surface 50b and the upper end surface 21c. For example, a recess may be provided in a part of the outer peripheral surface of the stator core 21, and the insert nut 50 may be press-fitted into the recess.

Next, a modification will be described. In each modification, the components having the same aspects as those in the above-described embodiment are designated by the same reference numerals, and the description thereof will be omitted.
<Modification example 1>
FIG. 4 is a partial cross-sectional view of the motor 101 of the first modification in the vicinity of the insert nut (fastened tool) 150. Further, FIG. 5 is a cross-sectional view taken along the line VV of FIG. This modification is mainly different from the above-described embodiment in that the stator core 121 has a first convex portion 123 on the outer peripheral surface and the insert nut 150 has a second convex portion on the outer peripheral surface.

Similar to the above embodiment, the insert nut 150 is located above the stator core 121. Further, the lower end surface 150b of the insert nut 150 comes into contact with the upper end surface 121c of the stator core 121. That is, the insert nut 150 is embedded in the housing 30 in contact with the stator core 121.

As shown in FIG. 5, the stator core 121 of this modified example has a first convex portion 123 that protrudes outward in the radial direction. The first convex portion 123 projects in an arc shape. As shown in FIG. 4, the first convex portion 123 has an upper end surface (end surface facing one side in the axial direction) 123a. The upper end surface 123a of the first convex portion 123 is a part of the upper end surface 121c of the stator core 121.

The insert nut 150 comes into contact with the upper end surface 121c of the stator core 121. More specifically, the insert nut 150 comes into contact with a region of the upper end surface 121c of the stator core 121 including the upper end surface 123a of the first convex portion 123.

According to this modification, since the stator core 121 has the first convex portion 123, the contact area between the insert nut 150 and the stator core 121 can be increased. As a result, the rigidity of the insert nut 150 can be further increased, and the effect of suppressing the resonance of the motor 101 can be enhanced.

As shown in FIG. 5, the insert nut 150 of this modified example has a columnar nut main body (main body) 158 extending along the center line J2 and a second convex portion protruding from the outer peripheral surface of the nut main body 158. It has 159 and. The second convex portion 159 extends in a rib shape along the axial direction. As shown in FIG. 4, the second convex portion 159 has a lower end surface (end surface facing the other side in the axial direction) 159b. The lower end surface 159b of the second convex portion 159 is a part of the lower end surface 150b of the insert nut 150.

The insert nut 150 comes into contact with the stator core 121 at the lower end surface 150b. More specifically, the insert nut 150 contacts the stator core 121 in a region of the lower end surface 150b including the lower end surface 159b of the second convex portion 159.

According to this modification, since the insert nut 150 has the second convex portion 159, the contact area between the insert nut 150 and the stator core 121 can be increased. As a result, the rigidity of the insert nut 150 can be further increased, and the effect of suppressing the resonance of the motor 101 can be enhanced.

In the motor 101 of this modification, the stator core 121 and the insert nut 150 each have a second convex portion 159, and a large contact area between the insert nut 150 and the stator core 121 is secured. However, the contact area between the insert nut 150 and the stator core 121 may be increased by having either one of the stator core 121 and the insert nut 150 having a convex portion.
The insert nut 150 and the stator core 121 may be fixed to each other at a contact portion by a joining means such as welding.

<Modification 2>
FIG. 6 is a partial cross-sectional view of the vicinity of the insert nut (fastened tool) 250 of the motor 201 of the modified example 2. Further, FIG. 7 is a cross-sectional view taken along the line VII-VII of FIG. This modification is mainly different from the above-described embodiment in that the insert nut 250 is arranged in the first recess provided on the outer peripheral surface of the stator core 221.

The insert nut 250 is located on the outer side in the radial direction of the stator core 221. The insert nut 250 comes into contact with the stator core 221 from the radial outside of the stator core 221. Therefore, the axial position of the insert nut 250 overlaps with the axial position of the stator core 221. According to this modification, since the insert nut 250 is located outside the stator core 221 in the radial direction, the axial dimension of the motor 201 is reduced as compared with the case where the insert nut is located on one side in the axial direction of the stator core. it can.

As shown in FIG. 7, the stator core 221 of this modified example has a first recess 223 that is recessed inward with respect to the outer peripheral surface. The first recess 223 extends along the axial direction. The first recess 223 is recessed in an arc shape when viewed from the axial direction. The radius of curvature of the first recess 223 coincides with the radius of the outer shape of the insert nut 250. The insert nut 250 enters the first recess 223. The insert nut 250 comes into surface contact with the inner wall surface of the first recess 223. Here, the inner wall surface of the first recess 223 means a surface of the first recess 223 facing outward in the radial direction and a surface facing upward.

According to this modification, the insert nut 250 enters the first recess 223 provided in the stator core 221 and comes into surface contact with the inner wall surface of the first recess 223. As a result, the contact area between the insert nut 250 and the stator core 221 can be increased, and the rigidity of the insert nut 250 can be further increased.
The insert nut 250 and the stator core 221 may be fixed to each other at a contact portion by a joining means such as welding.

<Modification example 3>
FIG. 8 is a partial cross-sectional view of the motor 301 of the modified example 3 in the vicinity of the insert nut (fastened tool) 350. Further, FIG. 9 is a cross-sectional view taken along the line IX-IX of FIG. This modification is mainly different from the above-described embodiment in that the insert nut 350 is arranged in the second recess 323 provided on the upper end surface of the stator core 321.

The stator core 321 has a core flange portion 324 that protrudes outward in the radial direction. The core flange portion 324 is located at the upper end portion of the stator core 321. The core flange portion 324 has a plate shape extending along a plane orthogonal to the axial direction. The core flange portion 324 is provided with a second recess 323 that penetrates in the vertical direction. That is, the stator core 321 has a second recess 323 that is recessed with respect to the upper end surface (end surface on one side in the axial direction). The second recess 323 is circular when viewed from the axial direction. The diameter of the second recess 323 is substantially equal to the outer diameter of the insert nut 350.

The insert nut 350 is press-fitted into the second recess 323. That is, the outer peripheral surface of the insert nut 350 comes into contact with the inner peripheral surface of the second recess 323. Further, the insert nut 350 is fixed to the stator core 321. According to this modification, the insert nut 350 is fixed to the stator core 321 by press fitting. Therefore, the fixing strength of the insert nut 350 with respect to the stator core 321 is increased. As a result, the rigidity of the insert nut 350 can be further increased, and the effect of suppressing the resonance of the motor 301 can be enhanced.

Although one embodiment of the present invention and a modification thereof have been described above, each configuration and a combination thereof in the embodiment and the modified example are examples, and the configuration is added within a range not deviating from the gist of the present invention. , Omission, replacement and other changes are possible. Moreover, the present invention is not limited to the embodiments.

For example, the use of the motor unit of the above-described embodiment and its modified example is not particularly limited. The motor unit of the above-described embodiment and its modification is mounted on, for example, an electric pump, an electric power steering, and the like.

1,101,201,301 ... motor, 9e ... fixing bolt (fastening member), 10 ... rotor, 20 ... stator, 21,121,221,321 ... stator core, 30 ... housing, 50, 150, 250, 350 ... insert Nut (to be fastened), 51 ... Screw hole (to be fastened), 123 ... First convex portion, 158 ... Nut main body (main body), 159 ... Second convex, 223 ... First concave, 323 ... 2 recesses, J ... central axis

Claims

A rotor that rotates around the central axis and
A stator having a stator core that is radially opposed to the rotor,
A housing made of resin and in which the stator is embedded,
With a tool to be fastened to which the fastening member is fastened,
The fastened tool is a motor that is embedded in the housing in contact with the stator core.
The motor according to claim 1, wherein the fastened tool is fixed to the stator core.
The motor according to claim 1 or 2, wherein the fastened tool is an insert nut having a screw hole.
The stator core has a tubular shape extending in the axial direction and has a tubular shape.
The motor according to any one of claims 1 to 3, wherein the fastened tool is located on one side in the axial direction of the stator core.
The stator core has a first convex portion that protrudes outward in the radial direction.
The motor according to claim 4, wherein the fastened tool contacts an end surface of the first convex portion facing one side in the axial direction.
The fastener to be fastened
The main body that extends along the axial direction,
It has a second convex portion protruding from the outer peripheral surface of the main body portion, and has.
The motor according to claim 4 or 5, wherein the fastened tool contacts the stator core at an end surface of the second convex portion facing the other side in the axial direction.
The stator core has a tubular shape extending in the axial direction and has a tubular shape.
The motor according to any one of claims 1 to 3, wherein the fastened tool is located on the radial outer side of the stator core.
The stator core has a first recess extending along the recess axis direction with respect to the outer peripheral surface.
The motor according to claim 7, wherein the fastener to be fastened enters the first recess.
The stator core has a second recess that is recessed with respect to one end face in the axial direction.
The motor according to any one of claims 1 to 3, wherein the fastened tool is press-fitted into the second recess.