Stator and motor

Patent metadata

Field	Value
Publication number	US-11601021-B2
Application number	US-202016836950-A
Country	US
Kind code	B2
Filing date	Apr 1, 2020
Priority date	May 8, 2019
Publication date	Mar 7, 2023
Grant date	Mar 7, 2023

Abstract

A motor includes a rotor and a stator. The stator is formed by laminating a plurality of magnetic thin strips each having a plurality of teeth parts. The magnetic thin strip includes an elliptical-shaped inner diameter part formed along tip end portions of the plural teeth parts. At least one magnetic thin strip in the laminated magnetic thin strips is shifted by a given angle with respect to other magnetic thin strips in a horizontal direction, and positions of all teeth parts of the laminated magnetic thin strips correspond to one another to reduce cogging torque.

First claim

What is claimed is:

1. A stator including a plurality of magnetic thin strips, each of the plurality of magnetic thin strips having a plurality of teeth parts, the plurality of magnetic thin strips being laminated, wherein
each of the plurality of magnetic thin strips includes an elliptical-shaped inner diameter part formed along tip end portions of the respective plurality of teeth parts,
in a plan view, at least one magnetic thin strip is angularly separated by a given angle with respect to at least one other magnetic strip of the plurality of magnetic thin strips, the at least one magnetic strip and the at least one other magnetic strip being adjacent each other,
the given angle is an angle made by adjacent ones of the plurality of teeth parts or an angle of an integral multiple of the angle made by the adjacent ones of the plurality of teeth parts,
positions of all of the plurality of teeth parts of the plurality of laminated magnetic thin strips correspond to one another, and
in the plan view, an inner diameter part of the at least one magnetic thin strip and an inner diameter part of the at least one other magnetic strip are radially offset with respect to each other by different distances.

2. The stator according to claim 1 , wherein the magnetic thin strip is an amorphous thin strip or a nanocrystal thin strip.

3. The stator according to claim 1 , wherein a thickness of one magnetic thin strip is 0.01 mm to 0.06 mm.

4. A motor comprising:
the stator according to claim 1 ; and
a rotor.

5. A stator including a plurality of magnetic thin strips, each of the plurality of magnetic thin strips having a plurality of teeth parts, the plurality of magnetic thin strips being laminated, wherein
each of the plurality of magnetic thin strips includes an elliptical-shaped inner diameter part formed along tip end portions of the respective plurality of teeth parts,
in a plan view, at least one magnetic thin strip is angularly separated by a given angle with respect to at least one other magnetic strip of the plurality of magnetic thin strips, the at least one magnetic strip and the at least one other magnetic strip being adjacent each other,
the plurality of laminated magnetic thin strips include a plurality of small laminates in which the magnetic thin strips are laminated so as not to be shifted by a given angle in the circumferential direction,
at least one small laminate in the plurality of small laminates is shifted by a given angle with respect to other of the plurality of small laminates in the circumferential direction,
positions of all of the plurality of teeth parts of the plurality of laminated magnetic thin strips correspond to one another, and
in the plan view, an inner diameter part of the at least one magnetic thin strip and an inner diameter part of the at least one other magnetic strip are radially offset with respect to each other by different distances.

6. The stator according to claim 5 , wherein a thickness of one small laminate is 0.06 mm or more.

7. The stator according to claim 5 , wherein the given angle is an angle made by adjacent ones of the plurality of teeth parts or an angle of an integral multiple of the angle made by the adjacent ones of the plurality of teeth parts.

8. The stator according to claim 5 , wherein the magnetic thin strip is an amorphous thin strip or a nanocrystal thin strip.

9. The stator according to claim 5 , wherein a thickness of one magnetic thin strip is 0.01 mm to 0.06 mm.

10. A motor comprising:
the stator according to claim 5 ; and
a rotor.

Assignees

• Panasonic Ip Man Co Ltd

Inventors

• Saitoh Mitsuo
• Nojiri Naoki
• Hamada Hideaki
• Tanimoto Kenji
• Kawai Fumihiko
• Nishikawa Yukio

Classifications

• H02K2201/03

  Machines characterised by aspects of the air-gap between rotor and stator · CPC title

• H02K1/146

  consisting of a generally annular yoke with salient poles · CPC title

• H02K2213/03

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

• H02K1/16

  Stator cores with slots for windings · CPC title

• H02K29/03 Primary

  with a magnetic circuit specially adapted for avoiding torque ripples or self-starting problems · CPC title