# US 2021/0242742 A1 · Motor Stator, Motor and Bus

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- Number: US 2021/0242742 A1
- Document ID: US20210242742A1
- Status: Published application
- Kind: A1
- Application number: 17/054,799
- Filed: 2019-01-07
- Published: 2021-08-05
- Earliest claimed: 2018-09-19
- Assignees: Gree Electric Appliances, Inc. of Zhuhai
- Applicants: Gree Electric Appliances, Inc. of Zhuhai
- Inventors: Keliang Liao; Tong Tong; Suhua Lu; Bin Chen
- Web page: https://patentgrep.com/patent/US20210242742A1

## CPC

- H02K 3/487: Slot-closing devices
- H02K 1/148: {Sectional cores (H02K1/141 takes precedence)}
- H02K 1/165: {Shape, form or location of the slots}
- H02K 21/22: with magnets rotating around the armatures, e.g. flywheel magnetos
- H02K 2201/03: Machines characterised by aspects of the air-gap between rotor and stator
- H02K 2213/03: Machines characterised by numerical values, ranges, mathematical expressions or similar information
- Y02T 10/64: Electric machine technologies in electromobility
- H02K: DYNAMO-ELECTRIC MACHINES (dynamo-electric relays H01H53/00; conversion of DC or AC input power into surge output power {H03K3/53})
- Y02T: CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION

## 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.

## Claims

### Claim 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.

### Claim 2 (depends on 1)

The motor stator according to claim 1, wherein 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.

### Claim 3 (depends on 1)

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.

### Claim 4 (depends on 3)

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

### Claim 5 (depends on 1)

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.

### Claim 6 (depends on 5)

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

### Claim 7 (depends on 1)

The motor stator according to claim 1, wherein the first tooth crest part and the second tooth crest part are in a clamped fixation with the tooth root.

### Claim 8 (depends on 7)

The motor stator according to claim 7, 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.

### Claim 9 (depends on 8)

The motor stator according to claim 8, wherein the cross section of the first clamping slot and/or the second clamping slot (is trapezoidal, ±-shaped or major arc shaped.

### Claim 10 (depends on 1)

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 W1,
0.15
*
W
T
≤
W
1
≤
0.3
*
W
T
;
W
T
=
D
S
*

N
S
,
wherein DS is an outer diameter of the stator, and NS is a number of a plurality of slots of the stator.

### Claim 11 (depends on 1)

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 L1,
0.2
*
L
T
≤
L
1
≤
0.4
*
L
T
;
L
T
=
D
S
-
D
Y
2
wherein DS is the outer diameter of the stator, and DY is a bottom diameter of the slot of the stator.

### Claim 12 (depends on 1)

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

### Claim 13 (depends on 1)

A motor, comprising the motor stator according to claim 1.

### Claim 14 (depends on 1)

A bus, comprising the motor stator according to claim 1.