Motor

Patent metadata

Field	Value
Publication number	US-2022278598-A1
Application number	US-202217651963-A
Country	US
Kind code	A1
Filing date	Feb 22, 2022
Priority date	Feb 26, 2021
Publication date	Sep 1, 2022
Grant date	—

Abstract

A motor 1 includes a shaft 2, a rotating body 6 fixed to the shaft 2, a first magnetic body 3 fixed to the shaft 2 and a stationary part including a second magnetic body 4, wherein one of the first magnetic body 3 and the second magnetic body 4 includes a magnet, and the first magnetic body 3 opposes the second magnetic body 4 over an entire circumference.

First claim

1 . A motor comprising:
a shaft; a rotating body fixed to the shaft; a first magnetic body fixed to the shaft; and a stationary part comprising a second magnetic body, wherein one of the first magnetic body and the second magnetic body include a magnet, and the first magnetic body opposes the second magnetic body over an entire circumference.

2 . The motor according to claim 1 , wherein
the first magnetic body and the second magnetic body oppose each other in a radial direction, and a distance between opposing surfaces of the first magnetic body and the second magnetic body opposing each other is constant over the entire circumference.

3 . The motor according to claim 1 , wherein
the first magnetic body and the second magnetic body oppose each other in an axial direction, and opposing surfaces of the first magnetic body and the second magnetic body opposing each other are flat surfaces.

4 . The motor according to claim 2 , wherein
the opposing surfaces of the first magnetic body and the second magnetic body include magnetic pole parts.

5 . The motor according to claim 1 , wherein
the opposing surfaces of the first magnetic body and the second magnetic body include magnetic pole parts, and the first magnetic body urges the shaft in an axial direction by a magnetic force between the first magnetic body and the second magnetic body.

6 . The motor according to claim 5 , further comprising:
a sliding member including a sliding surface in contact with a flat surface of the first magnetic body, wherein the first magnetic body includes the flat surface perpendicular to the axial direction and the second magnetic body is urged to the sliding member by a magnetic force between the first magnetic body and the second magnetic body.

7 . The motor according to claim 1 , further comprising:
a frame, wherein the opposing surfaces of the first magnetic body and the second magnetic body respectively include a magnetic pole part, and the second magnetic body is a second magnet fixed to an inner circumferential surface of the frame.

8 . The motor according to claim 4 , wherein
the second magnet opposes the rotating body as a member of a stator.

9 . The motor according to claim 1 , wherein
the first magnetic body is a first magnet and contains aluminum, nickel, and cobalt, and the second magnetic body is a second magnet and contains iron.

10 . The motor according to claim 1 , wherein
the first magnetic body is disposed at a first end side of the shaft, and an urging member configured to urge the shaft in an axial direction is disposed at a second end side of the shaft.

11 . The motor according to claim 10 , further comprising:
a fixing member fixed to the shaft and including a flat surface perpendicular to the axial direction; and a sliding member including a sliding surface in contact with the flat surface of the fixing member in the axial direction, wherein the urging member urges the sliding member in a direction of the fixing member to urge the shaft in the axial direction.

12 . The motor according to claim 1 , further comprising:
a third magnetic body fixed to a second end side of the shaft; and a fourth magnetic body opposing the third magnetic body wherein the first magnetic body is disposed at a first end side of the shaft.

13 . The motor according to claim 12 , wherein
the third magnetic body urges the shaft in the axial direction by a magnetic force between the third magnetic body and the fourth magnetic body.

14 . The motor according to claim 1 , wherein
a strength of a magnetic field of one magnetic body among the first magnetic body and the second magnetic body being exerted on the other magnetic body is greater than a coercive force of the other magnetic body.

Assignees

• Minebea Mitsumi Inc

Inventors

• OHBA Hirofumi
• Kuroda Minoru
• Miyazako Hiroshi

Classifications

• H02K1/06

  characterised by the shape, form or construction · CPC title

• H02K7/10 Primary

  Structural association with clutches, brakes, gears, pulleys or mechanical starters · CPC title

• H02K1/14

  Stator cores with salient poles · CPC title

• H02K23/00 Primary

  DC commutator motors or generators having mechanical commutator; Universal AC/DC commutator motors · CPC title

• H02K7/102

  with friction brakes · CPC title