Motor and electrical product

Patent metadata

Field	Value
Publication number	US-11588367-B2
Application number	US-202117329154-A
Country	US
Kind code	B2
Filing date	May 25, 2021
Priority date	May 26, 2020
Publication date	Feb 21, 2023
Grant date	Feb 21, 2023

Abstract

Provided is a motor including: a rotor, a stator, a first and second bearing, a support member, a housing including a first flat part and a cylindrical part, and a bearing holder. The cylindrical part includes: a first inner circumferential surface inside which is provided the stator; a second inner circumferential surface, a distance from the second inner circumferential surface to a central axis being greater than a distance from the first inner circumferential surface to the central axis, and the second inner circumferential surface contacting an outer circumferential surface of the bearing holder; and a stepped surface, connecting the first and the second inner circumferential surfaces, and contacting a lower surface of the bearing holder. The housing further includes a riveting part located on the second inner circumferential surface of the cylindrical part and fixing the bearing holder to the second inner circumferential surface of the cylindrical part.

First claim

What is claimed is:

1. A motor, comprising:
a rotor, rotating about a central axis;
a stator, located radially outside the rotor and provided opposite the rotor, having a plurality of coils wound therearound;
a first bearing and a second bearing, rotatably supporting the rotor relative to the stator;
a support member, located on an axially upper side of the stator and holding a conductive member that supplies power to the plurality of coils;
a housing, comprising a first flat part extending radially and a cylindrical part extending axially upward from a radially outer edge of the first flat part, thereby defining an opening that opens on an axially upper side, the first flat part holding the first bearing, the cylindrical part accommodating the rotor and the stator radially inside thereof; and
a bearing holder, provided on the axially upper side of the stator, holding the second bearing, and having at least one through hole through which the conductive member and/or a lead wire of the coils extends toward an upper side of the bearing holder;
wherein the cylindrical part comprises:
a first inner circumferential surface, the stator being provided inside the first inner circumferential surface;
a second inner circumferential surface, a distance from the second inner circumferential surface to the central axis being greater than a distance from the first inner circumferential surface to the central axis, and the second inner circumferential surface contacting an outer circumferential surface of the bearing holder; and
a stepped surface, connecting the first inner circumferential surface and the second inner circumferential surface, and contacting a lower surface of the bearing holder,

wherein
the housing further comprises a riveting part located on the second inner circumferential surface of the cylindrical part, and
the bearing holder is fixed to the second inner circumferential surface of the cylindrical part by the riveting part.

2. The motor as claimed in claim 1 , wherein
the housing further comprises a groove located on the second inner circumferential surface and extending axially;
the riveting part is located at an axially lower end of the groove.

3. The motor as claimed in claim 2 , wherein
the housing further comprises a protrusion protruding radially outward from the second inner circumferential surface of the cylindrical part;
the groove is located radially inside the protrusion;
the riveting part and the protrusion are provided radially opposite each other.

4. The motor as claimed in claim 3 , wherein
the motor further comprises a cover covering the opening of the housing;
the housing further comprises a sealing member axially located between the cylindrical part and the cover, and the sealing member is located radially outward of the groove.

5. The motor as claimed in claim 1 , wherein
the housing further comprises a protrusion protruding radially outward from the second inner circumferential surface of the cylindrical part;
the riveting part and the protrusion are provided radially opposite each other, and a circumferential length of the riveting part is shorter than a circumferential length of the protrusion.

6. The motor as claimed in claim 1 , wherein
the bearing holder is provided by stamping.

7. The motor as claimed in claim 6 , wherein the bearing holder comprises:
a second flat part extending radially; and
a first tubular part extending axially from a radially outer end of the second flat part.

8. The motor as claimed in claim 7 , wherein the bearing holder further comprises:
a second tubular part located radially outside the first tubular part; and
a curved part connecting the first tubular part and the second tubular part.

9. The motor as claimed in claim 8 , wherein
the first tubular part extends axially upward from a radially outer end of the second flat part, and
the curved part is located on an axially upper side of the first tubular part and contacts the riveting part.

10. An electrical product, comprising:
the motor as claimed in claim 1 .

Assignees

• Nidec Corp

Inventors

• Ho Quang Danh
• Yamaguchi Yuhei

Classifications

• H02K7/083

  radially supporting the rotary shaft at both ends of the rotor (H02K7/086, H02K7/09 take precedence) · CPC title

• F16C35/077

  between housing and outer race ring · CPC title

• H02K13/00

  Structural associations of current collectors with motors or generators, e.g. brush mounting plates or connections to windings (supporting or protecting brushes or brush holders in motor casings or enclosures H02K5/14); Disposition of current collectors in motors or generators; Arrangements for improving commutation · CPC title

• H02K5/161 Primary

  radially supporting the rotary shaft at both ends of the rotor (H02K5/165, H02K5/167, H02K5/173 take precedence) · CPC title

• F16C2380/26

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