Motor

Patent metadata

Field	Value
Publication number	US-10523083-B2
Application number	US-201815972257-A
Country	US
Kind code	B2
Filing date	May 7, 2018
Priority date	May 29, 2017
Publication date	Dec 31, 2019
Grant date	Dec 31, 2019

Abstract

A motor includes a bearing housing and a stator. The stator includes a stator core, an insulator, and a conductor. The insulator is an insulating body covering at least a part of the stator core. The conductor is wound around the stator core via the insulator. The bearing housing and the stator are connected to each other by a main adhesive and an auxiliary adhesive. A curing time of the auxiliary adhesive is shorter than that of the main adhesive. Therefore, the bearing housing and the stator can be temporarily fixed by the auxiliary adhesive of which the curing time is short until the main adhesive is cured. Therefore, it is possible to suppress that the position of the stator is deviated with respect to the bearing housing until the main adhesive is cured.

First claim

What is claimed is:

1. A motor comprising:
a stationary portion; and
a rotating portion that is rotatably supported by the stationary portion centered on a central axis extending upward and downward,
wherein the stationary portion includes
a cylindrical bearing housing that extends in an axial direction around the central axis, and
a stator that is disposed on an outside of the bearing housing in a radial direction,
wherein the stator includes
a stator core that is a magnetic body,
an insulator that is an insulating body covering at least a part of the stator core, and
a conductor that is wound around the stator core via the insulator, and
wherein the bearing housing and the stator are connected to each other by
a main adhesive, and
an auxiliary adhesive of which a curing time is shorter than a curing time of the main adhesive.

2. The motor according to claim 1 ,
wherein the main adhesive is an elastic adhesive elastically deformable after curing.

3. The motor according to claim 2 ,
wherein the main adhesive connects the bearing housing and the stator core to each other.

4. The motor according to claim 1 ,
wherein the auxiliary adhesive is an ultraviolet curable adhesive.

5. The motor according to claim 4 ,
wherein the auxiliary adhesive connects the bearing housing and the stator core to each other.

6. The motor according to claim 4 ,
wherein the auxiliary adhesive connects the bearing housing and the insulator to each other.

7. The motor according to claim 6 ,
wherein the bearing housing includes
a first outer peripheral surface that faces the insulator in the radial direction,
wherein the first outer peripheral surface has a plurality of grooves, and
wherein the auxiliary adhesive connects the first outer peripheral surface and the insulator to each other.

8. The motor according to claim 7 ,
wherein the plurality of grooves include
a plurality of first grooves that extend obliquely with respect to the axial direction, and
a plurality of second grooves that extend at an angle different from an angle of the first grooves, and
wherein the plurality of first grooves and the plurality of second grooves intersect one another.

9. The motor according to claim 7 ,
wherein the plurality of grooves extend in the axial direction and are disposed in a circumferential direction.

10. The motor according to claim 7 ,
wherein the plurality of grooves extend spirally centered on the central axis.

11. The motor according to claim 1 ,
wherein the insulator includes
a claw portion that projects to an inside in the radial direction, and
wherein the auxiliary adhesive connects at least a part of the claw portion and the bearing housing to each other.

12. The motor according to claim 11 ,
wherein the insulator includes a plurality of claw portions, each of which is the claw portion.

13. The motor according to claim 12 , wherein the plurality of claw portions are disposed at equal intervals in a circumferential direction.

14. The motor according to claim 11 ,
wherein the auxiliary adhesive is in contact with both
an end surface of the claw portion on the inside in the radial direction, and
an end surface of the claw portion in a circumferential direction.

15. The motor according to claim 11 ,
wherein the claw portion includes
a claw portion body that extends to the inside in the radial direction, and
a claw wall portion that extends from an end portion of the claw portion body on the inside in the radial direction to an upper side of the claw portion body in the axial direction, and
wherein the auxiliary adhesive connects the bearing housing and the claw wall portion to each other.

16. The motor according to claim 11 ,
wherein the bearing housing includes a housing recessed portion that is recessed to the inside in the radial direction, on an outer peripheral surface,
wherein the outer peripheral surface is positioned at the housing recessed portion, and
wherein an end surface of the claw portion on the inside in the radial direction is accommodated in the housing recessed portion.

17. The motor according to claim 11 ,
wherein the claw portion includes a claw recessed portion that is positioned on an end surface on the inside in the radial direction, and
wherein the auxiliary adhesive is positioned in the claw recessed portion and connects the claw portion and the bearing housing to each other.

18. The motor according to claim 11 ,
wherein the stator core includes a plurality of core recessed portions that are recessed to an outside in the radial direction, on an inner peripheral surface, and
wherein the main adhesive is positioned in the core recessed portions.

19. The motor according to claim 18 ,
wherein the claw portion and corresponding one of the core recessed portions overlap each other in top view.

20. The motor according to claim 1 ,
wherein the bearing housing includes a stepped surface that faces a lower surface of the stator core in the axial direction, and
wherein a part of the main adhesive is interposed between the lower surface of the stator core and the stepped surface.

Assignees

• Nidec Corp

Inventors

• Horii Yuya
• Kurazono Kohei

Classifications

• F16C33/08 Primary

  Attachment of brasses, bushes or linings to the bearing housing · CPC title

• F16C2380/26

  Dynamo-electric machines or combinations therewith, e.g. electro-motors and generators · CPC title

• F16C17/107

  with at least one surface for radial load and at least one surface for axial load · CPC title

• H02K1/187

  to inner stators · CPC title

• H02K5/1675 Primary

  radially supporting the rotary shaft at only one end of the rotor (H02K5/1677 takes precedence) · CPC title