Motor stator with tooth crest air gap, motor and bus

Patent metadata

Field	Value
Publication number	US-11575290-B2
Application number	US-201917054799-A
Country	US
Kind code	B2
Filing date	Jan 7, 2019
Priority date	Sep 19, 2018
Publication date	Feb 7, 2023
Grant date	Feb 7, 2023

Abstract

The present disclosure provides a motor stator, a motor and a bus. The motor stator includes a stator tooth. The stator tooth includes a tooth root and a tooth crest. The tooth crest is provided on the tooth root. The tooth crest includes a first tooth crest part and a second tooth crest part. The first tooth crest part and the second tooth crest part are provided on two sides of the tooth root along the circumference of the motor stator, respectively, and a tooth crest air gap is formed between the first tooth crest part and the second tooth crest part. According to the present disclosure, the motor stator is adapt to reduce magnetic flux leakage, and enhance the utilization rate of a permanent magnet and output torque.

First claim

The invention claimed is:

1. A motor stator, comprising a stator tooth, wherein the stator tooth comprises a tooth root and a tooth crest; the tooth crest is provided on the tooth root; the tooth crest comprises a first tooth crest part and a second tooth crest part; the first tooth crest part and the second tooth crest part are provided on two sides of the tooth root along the circumference of the motor stator, respectively, and a tooth crest air gap is formed between the first tooth crest part and the second tooth crest part;
the tooth crest air gap radially penetrates through the first tooth crest part and the second tooth crest part, and separates the first tooth crest part from the second tooth crest part;
the first tooth crest part and the second tooth crest part are completely separated by the tooth crest air gap, and the first tooth crest part and the second tooth crest part are two completely independent components;
wherein the first tooth crest part and the second tooth crest part are in a clamped fixation with the tooth root respectively.

2. The motor stator according to claim 1 , wherein the tooth crest air gap radially extends from a plurality of ends, close to the tooth root, of the first tooth crest part and the second tooth crest part, and the first tooth crest part and the second tooth crest part abut at a plurality of ends away from the tooth root, so as to close the tooth crest air gap.

3. The motor stator according to claim 2 , wherein the first tooth crest part and the second tooth crest part are integrally molded.

4. The motor stator according to claim 1 , wherein the first tooth crest part of the stator tooth abuts the second tooth crest part of an adjoining stator tooth to form a closed slot.

5. The motor stator according to claim 4 , wherein the first tooth crest part of the stator tooth and the second tooth crest part of the adjoining stator tooth are integrally molded.

6. The motor stator according to claim 1 , wherein the tooth root is provided with a first clamping slot which extends along an axis direction of the motor stator, and the first tooth crest part is clamped in the first clamping slot; and/or, the tooth root is provided with a second clamping slot which extends along the axis direction of the motor stator, and the second tooth crest part is clamped in the second clamping slot.

7. The motor stator according to claim 6 , wherein the cross section of the first clamping slot and/or the second clamping slot is trapezoidal, shaped or major arc shaped.

8. The motor stator according to claim 1 , wherein on a cross-section which is perpendicular to a central axis of the motor stator, a width of the tooth crest air gap is W 1 ,
0.15* W T ≤W 1 ≤0.3* W T ;

W
T

=

D
S

⋆
π

N
S

,

wherein D S is an outer diameter of the stator, and N S is a number of a plurality of slots of the stator.

9. The motor stator according to claim 1 , wherein on a cross-section which is perpendicular to a central axis of the motor stator, a length of the tooth crest air gap is L 1 ,
0.2* L T ≤L 1 ≤0.4* L T ;

L
T

=

D
S

-

D
Y

2

.

wherein D S is the outer diameter of the stator, and D Y is a bottom diameter of the slot of the stator.

10. The motor stator according to claim 1 , wherein the tooth crest is made of a plurality of oriented silicon steel sheets.

11. A motor, comprising a motor stator, including a stator tooth, wherein the stator tooth comprises a tooth root and a tooth crest; the tooth crest is provided on the tooth root; the tooth crest comprises a first tooth crest part and a second tooth crest part; the first tooth crest part and the second tooth crest part are provided on two sides of the tooth root along the circumference of the motor stator, respectively, and a tooth crest air gap is formed between the first tooth crest part and the second tooth crest part;
the tooth crest air gap radially penetrates through the first tooth crest part and the second tooth crest pat, and separates the first tooth crest pail from the second tooth crest part; the first tooth crest part and the second tooth crest par are completely separated by the tooth crest air gap, and the first tooth crest part and the second tooth crest part are two completely independent components, wherein the first tooth crest part and the second tooth crest part are in a clamped fixation with the tooth root respectively.

12. A bus, comprising a motor including a motor stator, comprising a stator tooth, wherein the stator tooth comprises a tooth root and a tooth crest; the tooth crest is provided on the tooth root; the tooth crest comprises a first tooth crest part and a second tooth crest part; the first tooth crest part and the second tooth crest part are provided on two sides of the tooth root along the circumference of the motor stator, respectively, and a tooth crest air gap is formed between the first tooth crest part and the second tooth crest part;
the tooth crest air gap radially penetrates through the first tooth crest part and the second tooth crest part, and separates the first tooth crest par from the second tooth crest part; the first tooth crest part and the second tooth crest part are completely separated by the tooth crest air gap, and the first tooth crest part and the second tooth crest part are two completely independent components;
wherein the first tooth crest part and the second tooth crest part are in a clamped fixation with the tooth root respectively.

Assignees

• Gree Electric Appliances Inc Zhuhai

Inventors

• Liao Keliang
• Tong Tong
• Lu Suhua
• Chen Bin

Classifications

• Y02T10/64

  Electric machine technologies in electromobility · CPC title

• H02K21/26

  with rotating armatures and stationary magnets · CPC title

• H02K2201/03

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

• H02K2213/03

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

• H02K1/165 Primary

  Shape, form or location of the slots · CPC title