# US 12,003,140 B2 · Rotor for motor, drive motor and vehicle

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- Number: US 12,003,140 B2
- Document ID: US12003140B2
- Status: Granted
- Kind: B2
- Application number: 17/515,978
- Filed: 2021-11-01
- Published: 2022-02-24
- Granted: 2024-06-04
- Earliest claimed: 2019-12-30
- Assignees: Anhui Welling Auto Parts Co., Ltd.
- Applicants: Anhui Welling Auto Parts Co., Ltd.
- Inventors: Yang Xiao; Ziqiang Zhu; Jintao Chen; Di Wu
- Web page: https://patentgrep.com/patent/US12003140B2

## CPC

- H02K 1/2766: {having a flux concentration effect}
- H02K 1/246: {Variable reluctance rotors}
- H02K 1/274: the rotor consisting of two or more circumferentially positioned magnets
- H02K 1/2753: the rotor consisting of magnets or groups of magnets arranged with alternating polarity
- H02K 1/276: Magnets embedded in the magnetic core, e.g. interior permanent magnets [IPM]
- H02K 2213/03: Machines characterised by numerical values, ranges, mathematical expressions or similar information
- H02K: DYNAMO-ELECTRIC MACHINES (dynamo-electric relays H01H53/00; conversion of DC or AC input power into surge output power {H03K3/53})

## Abstract

A rotor for a motor is provided. The rotor has a rotor core, first permanent magnets mounted in first grooves of the rotor core, and second permanent magnets mounted in second grooves of the rotor core. The rotor core is provided with groove groups distributed in a peripheral direction of the rotor core. Each groove group has an air groove, a first groove and a second groove. The ends of the air groove, the first groove and the second groove, which are close to a center point of the rotor core, are close to one another. The end of the air groove, the first groove and the second groove, which are away from the center point of the rotor core, are away from one another. Multiple magnetic isolation structures are provided in the rotor core.

## Claims

### Claim 1

A rotor for a motor, comprising:
a rotor core comprising:
a plurality of groove groups distributed along a peripheral direction of the rotor core, each groove group comprising an air groove, a first groove, and a second groove, wherein respective first ends, near a center point of the rotor core, of the air groove, the first groove, and the second groove are close to one another, and respective second ends, away from the center point of the rotor core, of the air groove, the first groove, and the second groove are away from one another;
a first magnetic isolation structure arranged between the first end of the air groove and the first end of the first groove that are close to each other; and
a second magnetic isolation structure arranged between the first end of the first groove and the first end of the second groove that are close to each other,
wherein:
the second ends, away from the center point of the rotor core, of the air groove, the first groove and the second groove are distributed along a first rotation direction of the rotor; and
each of the groove groups is asymmetrical about a line through a center of a smallest sector of the rotor core that encompasses the respective groove group;
a plurality of first permanent magnets each mounted in a respective first groove; and
a plurality of second permanent magnets each mounted in a respective second groove.

### Claim 2 (depends on 1)

The rotor according to claim 1, wherein:
the first groove comprises a third magnetic isolation structure on a side of the first groove away from the center point of the rotor core, the second groove comprises a fourth magnetic isolation structure on a side of the second groove away from the center point of the rotor core, and the air groove comprises a fifth magnetic isolation structure on a side of the air groove away from the center point of the rotor core; and
along the first rotation direction, an angle α formed between a line connecting a back endpoint of the third magnetic isolation structure to the center point of the rotor core and a line connecting a back endpoint of the fifth magnetic isolation structure to the center point of the rotor core is smaller than an angle β formed between the line connecting the back endpoint of the third magnetic isolation structure to the center point of the rotor core and a line connecting an advancing endpoint of the fourth magnetic isolation structure to the center point of the rotor core.

### Claim 3 (depends on 1)

The rotor according to claim 1, wherein an interval L1 between a first end of a first permanent magnet near the center point of the rotor core and a second end of the first permanent magnet away from the center point of the rotor core is less than or equal to an interval L2 between a first end of a second permanent magnet near the center point of the rotor core and a second end of the second permanent magnet away from the center point of the rotor core.

### Claim 4 (depends on 1)

The rotor according to claim 1, wherein:
the first magnetic isolation structure comprises a first internal magnetic bridge between the first end of the air groove and the first end of the first groove close to each other, or a first connection port connecting the first end of the air groove with the first end of the first groove close to each other; or
the second magnetic isolation structure comprises a second internal magnetic bridge between the first end of the first groove and the first end of the second groove close to each other, or a second connection port connecting the first end of the first groove with the first end of the second groove close to each other.

### Claim 5 (depends on 1)

The rotor according to claim 1, wherein:
the first magnetic isolation structure comprises a first internal magnetic bridge between the first end of the air groove and the first end of the first groove close to each other, and a thickness of the first internal magnetic bridge along the peripheral direction of the rotor core is equal to 4 mm, or greater than 0 mm and less than 4 mm; or
the second magnetic isolation structure comprises a second internal magnetic bridge between the first end of the first groove and the first end of the second groove close to each other, and a thickness of the second internal magnetic bridge along the peripheral direction of the rotor core is equal to 4 mm, or greater than 0 mm and less than 4 mm.

### Claim 6 (depends on 1)

The rotor according to claim 1, wherein:
the first groove comprises a third magnetic isolation structure on a side of the first groove away from the center point of the rotor core, and the third magnetic isolation structure comprises a first external magnetic bridge between the second end of the first groove away from the center point of the rotor core and an outer peripheral surface of the rotor core or comprises a first groove opening formed on the outer peripheral surface of the rotor core by the second end of the first groove away from the center point of the rotor core, wherein the second end of the first groove extends to the outer peripheral surface of the rotor core; or
the second groove comprises a fourth magnetic isolation structure on a side of the second groove away from the center point of the rotor core, and the fourth magnetic isolation structure comprises a second external magnetic bridge between the second end of the second groove away from the center point of the rotor core and the outer peripheral surface of the rotor core or comprises a second groove opening formed on the outer peripheral surface of the rotor core by the second end of the second groove away from the center point of the rotor core, wherein the second end of the second groove extends to the outer peripheral surface of the rotor core; or
the air groove comprises a fifth magnetic isolation structure on a side of the air groove away from the center point of the rotor core, and the fifth magnetic isolation structure comprises a third external magnetic bridge between the second end of the air groove away from the center point of the rotor core and the outer peripheral surface of the rotor core or comprises a third groove opening formed on the outer peripheral surface of the rotor core by the second end of the air groove away from the center point of the rotor core, wherein the second end of the air groove extends to the outer peripheral surface of the rotor core.

### Claim 7 (depends on 1)

The rotor according to claim 1, wherein:
a first external magnetic bridge is formed between the second end of the first groove away from the center point of the rotor core and an outer peripheral surface of the rotor core, and a thickness of the first external magnetic bridge along a radial direction of the rotor core is equal to 3.5 mm, or greater than 0 mm and less than 3.5 mm; or
a second external magnetic bridge is formed between the second end of the second groove away from the center point of the rotor core and the outer peripheral surface of the rotor core, and a thickness of the second external magnetic bridge along the radial direction of the rotor core is equal to 3.5 mm, or greater than 0 mm and less than 3.5 mm; or
a third external magnetic bridge is formed between the second end of the air groove away from the center point of the rotor core and the outer peripheral surface of the rotor core, and a thickness of the third external magnetic bridge along the radial direction of the rotor core is equal to 3.5 mm, or greater than 0 mm and less than 3.5 mm.

### Claim 8 (depends on 1)

The rotor according to claim 1, wherein the rotor core further comprises:
a first part on a first side of the groove group close to the center point of the rotor core; and
a second part on a second side of the groove group away from the center point of the rotor core,
wherein:
the first part and the second part are connected through a first connection section;
the second part comprises a third portion and a fourth portion; and
the third portion is located between the first groove and the second groove, and the fourth portion is located between the air groove and the first groove in the peripheral direction of the rotor core, and
wherein:
the third portion and the fourth portion are connected to the first part through the first connection section, and the third portion and the fourth portion are not directly connected to each other; or
the third portion and the fourth portion are connected by a second connection section, and at least one of the third portion and the fourth portion are connected to the first part through the first connection section.

### Claim 9 (depends on 1)

The rotor according to claim 1, wherein:
an amount of poles of the rotor is K;
a fourth magnetic isolation structure is arranged on a side of the second groove away from the center point of the rotor core, and a fifth magnetic isolation structure is arranged on a side of the air groove away from the center point of the rotor core; and
an angle γ formed between a line connecting a back endpoint of the fifth magnetic isolation structure to the center point of the rotor core and a line connecting an advancing endpoint of the fourth magnetic isolation structure to the center point of the rotor core, along the first rotation direction, is less than or equal to 170°/K.

### Claim 10 (depends on 1)

The rotor according to claim 1, wherein:
the first groove comprises at least one first groove segment, the first permanent magnets are mounted in the at least one first groove segment, and the at least one first groove segment extends in a same direction or different directions; and
the second groove comprises at least one second groove segment, the second permanent magnets are mounted in the at least one second groove segment, and the at least one second groove segment extends in a same direction or different directions.

### Claim 11 (depends on 10)

The rotor according to claim 10, wherein an amount of the first groove segments in each first groove does not exceed three, and an amount of the second groove segments in each second groove does not exceed three.

### Claim 12 (depends on 10)

The rotor according to claim 10, wherein:
a groove wall surface of the first groove segment without the first permanent magnet comprises at least one of a flat surface, a curved surface and a bent surface; and
a groove wall surface of the second groove segment without the second permanent magnet comprises at least one of a flat surface, a curved surface and a bent surface.

### Claim 13 (depends on 1)

The rotor according to claim 1, wherein the air groove comprises at least one third groove segment, and a groove wall surface of the at least one third groove segment comprises at least one of a flat surface, a curved surface and a bent surface.

### Claim 14 (depends on 1)

The rotor according to claim 1, wherein the rotor comprises a multilayer permanent magnet structure under a common magnetic pole, and the first permanent magnet and the second permanent magnet within the same groove group constitute one layer of the permanent magnet structure.

### Claim 15 (depends on 14)

The rotor according to claim 14, further comprising:
a plurality of third permanent magnets mounted in the rotor core, distributed along the peripheral direction of the rotor core, and constituting another layer of the permanent magnet structure.

### Claim 16 (depends on 15)

The rotor according to claim 15, wherein:
the third permanent magnet is arranged between the first groove and the second groove of the groove group in the peripheral direction of the rotor core; and
the third permanent magnet extends perpendicular to a radial direction of the rotor core or at an angle to the radial extension of the rotor core, or forms a V-shaped permanent magnet structure.

### Claim 17 (depends on 15)

The rotor according to claim 15, wherein:
the third permanent magnet is arranged between two adjacent groove groups in the peripheral direction of the rotor core; and
the third permanent magnet extends along a radial direction of the rotor core or at an angle to the radial direction of the rotor core.

### Claim 18 (depends on 15)

The rotor according to claim 15, wherein:
a third groove is arranged on side of the groove group close to the center point of the rotor core and is a V-shaped or U-shaped groove;
the third permanent magnets are arranged in the third groove and formed as a V-shaped or U-shaped permanent magnet structure; and
the groove group is located within an area enclosed by the V-shaped or U-shaped groove.

### Claim 19 (depends on 1)

The rotor according to claim 1, wherein:
air gap magnetic fields generated by the first permanent magnet and the second permanent magnet within a same groove group are mutually reinforced; and
the first permanent magnets in adjacent groove groups are magnetized in opposite directions, and the second permanent magnets in adjacent groove groups are magnetized in opposite directions.

### Claim 20 (depends on 1)

The rotor according to claim 1, wherein an amount M of the groove groups is equal to an amount K of poles of the rotor.

### Claim 21

A drive motor comprising:
a rotor comprising:
a rotor core comprising:
a plurality of groove groups distributed along a peripheral direction of the rotor core, each groove group comprising an air groove, a first groove, and a second groove, wherein respective first ends, near a center point of the rotor core, of the air groove, the first groove, and the second groove are close to one another, and respective second ends, away from the center point of the rotor core, of the air groove, the first groove, and the second groove are away from one another;
a first magnetic isolation structure arranged between the first end of the air groove and the first end of the first groove that are close to each other; and
a second magnetic isolation structure arranged between the first end of the first groove and the first end of the second groove that are close to each other;
wherein:
the second ends, away from the center point of the rotor core, of the air groove, the first groove and the second groove are distributed along a first rotation direction of the rotor; and
each of the groove groups is asymmetrical about a line through a center of a smallest sector of the rotor core that encompasses the respective groove group;
a plurality of first permanent magnets each mounted in a respective first groove; and
a plurality of second permanent magnets each mounted in a respective second groove.

### Claim 22

A vehicle comprising:
a drive motor comprising:
a rotor comprising:
a rotor core comprising:
a plurality of groove groups distributed along a peripheral direction of the rotor core, each groove group comprising an air groove, a first groove, and a second groove, wherein respective first ends, near a center point of the rotor core, of the air groove, the first groove, and the second groove are close to one another, and respective second ends, away from the center point of the rotor core, of the air groove, the first groove, and the second groove are away from one another;
a first magnetic isolation structure arranged between the first end of the air groove and the first end of the first groove that are close to each other; and
a second magnetic isolation structure arranged between the first end of the first groove and the first end of the second groove that are close to each other;
wherein:
the second ends, away from the center point of the rotor core, of the air groove, the first groove and the second groove are distributed along a first rotation direction of the rotor; and
each of the groove groups is asymmetrical about a line through a center of a smallest sector of the rotor core that encompasses the respective groove group;
a plurality of first permanent magnets each mounted in a respective first groove; and
a plurality of second permanent magnets each mounted in a respective second groove.