Motor with casing axially guided by pillars

Patent metadata

Field	Value
Publication number	US-12301057-B2
Application number	US-202117319541-A
Country	US
Kind code	B2
Filing date	May 13, 2021
Priority date	May 21, 2020
Publication date	May 13, 2025
Grant date	May 13, 2025

Abstract

A stator of a motor includes a plurality of magnetic bodies stacked in a direction of a central axis (X), a case configured to hold the plurality of magnetic bodies, a cover configured to cover the case, and a pillar including a guiding part configured to guide the plurality of magnetic bodies in the direction of the central axis (X). The plurality of magnetic bodies include a guided part guided by the pillar. The pillar includes an outer peripheral surface including positioning parts. The positioning parts determine relative positions of the case and the cover in an axial direction.

First claim

The invention claimed is:

1. A motor comprising:
a housing including an opening,
a rotor including a bearing provided at the opening of the housing,
a stator including a case and a cover accommodated in the housing,
wherein the stator includes a plurality of magnetic bodies stacked in an axial direction and formed of an amorphous alloy;
wherein the plurality of magnetic bodies are held by the case and the cover,

wherein the case is configured to hold the plurality of magnetic bodies, the case being formed of a non-magnetic metal material;
wherein the cover is configured to cover the case, the cover being formed of a non-magnetic metal material; and
a pillar including a guiding part configured to guide the plurality of magnetic bodies in the axial direction,
wherein the plurality of magnetic bodies include a guided part guided by the pillar,
the pillar includes an outer peripheral surface including positioning parts, and
the positioning parts determine relative positions of the case and the cover in the axial direction and prevent the case and the cover in the axial direction from being closer to the plurality of magnetic bodies.

2. The motor according to claim 1 ,
wherein the positioning parts position each of the case and the cover.

3. The motor according to claim 1 , comprising:
an insulator disposed between the case and the cover in the axial direction,
wherein the insulator includes a holding body configured to hold the plurality of magnetic bodies and a lid body, and
outer peripheral parts of the plurality of magnetic bodies are exposed from the holding body in a radial direction.

4. The motor according to claim 3 ,
wherein the holding body includes a bottom part at a side of the case and a wall part provided at the bottom part, and
the lid body is supported by an end part of the wall part at a side of the cover.

5. The motor according to claim 1 ,
wherein the housing is fixed to the case or the cover.

Assignees

• Minebea Mitsumi Inc

Inventors

• Ohmura Jun

Classifications

• H02K5/04

  Casings or enclosures characterised by the shape, form or construction thereof · CPC title

• H02K2213/03

  Machines characterised by numerical values, ranges, mathematical expressions or similar information · CPC title

• H02K3/345

  between conductor and core, e.g. slot insulation · CPC title

• H02K3/12

  arranged in slots · CPC title

• H02K3/28

  Layout of windings or of connections between windings (windings for pole-changing H02K17/06, H02K17/14, H02K19/12, H02K19/32) · CPC title