Motor

Patent metadata

Field	Value
Publication number	US-11063400-B2
Application number	US-201916417053-A
Country	US
Kind code	B2
Filing date	May 20, 2019
Priority date	May 22, 2018
Publication date	Jul 13, 2021
Grant date	Jul 13, 2021

Abstract

A motor including: a frame having an outer diameter of 10 millimeters or less and an inner surface; an annular magnet attached to the inner surface of the frame; a bracket provided at the frame; a columnar brush formed of carbon and having an outer peripheral surface; a commutator contacting the outer peripheral surface of the brush; and an elastic member supporting the brush at the bracket, in which a part of the elastic member is inside the brush.

First claim

What is claimed is:

1. A motor comprising:
a frame having an outermost diameter of 10 millimeters or less and having an inner surface;
an annular magnet attached to the inner surface of the frame;
a bracket provided at the frame, the bracket comprising a wall portion;
a columnar brush formed of carbon and having an outer peripheral surface;
a commutator contacting the outer peripheral surface of the brush;
a terminal portion; and
an elastic member supporting the brush at the bracket,

wherein:
the elastic member includes a first extending portion, a second extending portion and a coil portion between the first extending portion and the second extending portion,
a part of the second extending portion of the elastic member is inside the brush,
the first extending portion is fixed to the terminal portion,
the wall portion is arranged between the brush and the terminal portion,
the outer peripheral surface of the brush is cylindrical in shape, and
the second extending portion of the elastic member penetrates through the brush in an axial direction of the columnar brush.

2. The motor according to claim 1 , wherein the commutator includes a plurality of commutator segments arranged in a peripheral direction, and wherein a width of the outer peripheral surface of the brush is equal to or smaller than a width of one of the commutator segments in the peripheral direction.

3. The motor according to claim 1 , comprising a rotation axis defining a rotation axis direction, wherein the bracket includes an opening portion facing the brush in the rotation axis direction of the motor.

4. The motor according to claim 3 , wherein the commutator is disposed at an inner side of the opening portion, and wherein a first part of the opening portion facing the brush, the commutator, and a second part of the opening portion are lined in a radial direction.

5. The motor according to claim 3 , wherein the opening portion has a planar shape having a long side and a short side.

6. The motor according to claim 1 , wherein a rib is provided at an outer peripheral surface of the bracket, and wherein the rib contacts the inner surface of the frame.

7. The motor according to claim 1 comprising:
a rotation axis,
a plurality of brushes including the columnar brush,
a plurality of elastic members including the elastic member, and

wherein a position of a first brush of the brushes is higher than a position of a second brush of the brushes in a rotation axis direction of the motor.

8. The motor according to claim 7 , wherein the first brush of the brushes is configured to come into contact with the second brush of the brushes, and wherein a first elastic member of the elastic members, supporting the first brush of the brushes, is configured to intersect with a second elastic member of the elastic members supporting the second brush of the brushes.

Assignees

• Minebea Mitsumi Inc

Inventors

• Umehara Mikio
• Omura Atsushi
• Sato Kazuaki

Classifications

• H02K5/225

  Terminal boxes or connection arrangements (specially adapted for submersible motors H02K5/132) · CPC title

• H02K23/04

  having permanent magnet excitation · CPC title

• H01R39/381 Primary

  characterised by the application of pressure to brush · CPC title

• H02K5/145

  Fixedly supported brushes or brush holders, e.g. leaf or leaf-mounted brushes · CPC title

• H02K13/006

  Structural associations of commutators · CPC title