Permanent magnet assisted synchronous reluctance motor and electric car having the same

Patent metadata

Field	Value
Publication number	US-11418072-B2
Application number	US-201816975614-A
Country	US
Kind code	B2
Filing date	Dec 7, 2018
Priority date	May 8, 2018
Publication date	Aug 16, 2022
Grant date	Aug 16, 2022

Abstract

The present disclosure provides a permanent magnet assisted synchronous reluctance motor and an electric car having the same. The permanent magnet assisted synchronous reluctance motor includes: a stator body, wherein a plurality of stator teeth are provided on an inner circumferential surface of the stator body, and a stator slot is formed between two adjacent stator teeth; a rotor body disposed within the stator body and opened with a group of permanent magnet slots, which include a plurality of permanent magnet slots, wherein a first end of at least one of the plurality of permanent magnet slots and an end of one of the plurality of stator teeth are arranged oppositely, and a second end of the permanent magnet slot and the stator slot formed by two adjacent stator teeth among remaining stator teeth are arranged oppositely.

First claim

What is claimed is:

1. A permanent magnet assisted synchronous reluctance motor, comprising:
a stator body, wherein a plurality of stator teeth are provided on an inner circumferential surface of the stator body, and a stator slot is formed between two adjacent stator teeth;
a rotor body disposed within the stator body and opened with a group of permanent magnet slots, which comprise a plurality of permanent magnet slots, wherein a first end of at least one of the plurality of permanent magnet slots and an end of one of the plurality of stator teeth are arranged oppositely, and a second end of the permanent magnet slot and the stator slot formed by two adjacent stator teeth among remaining stator teeth are arranged oppositely;
wherein a geometric center line of the first end of the permanent magnet slot along a radial direction of the rotor body coincides with a geometric center line of the stator tooth along the radial direction of the stator body, and the geometric center line of the second end of the permanent magnet slot along the radial direction of the rotor body coincides with a geometric center line of the stator slot along the radial direction of the stator body.

2. The permanent magnet assisted synchronous reluctance motor according to claim 1 , wherein the plurality of permanent magnet slots comprise:
an inner-layer permanent magnet slot, wherein a first end of the inner-layer permanent magnet slot and an end of one of the plurality of stator teeth are arranged oppositely, a second end of the inner-layer permanent magnet slot and the stator slot formed by the two adjacent stator teeth among the remaining stator teeth are arranged oppositely, and a middle of the inner-layer permanent magnet slot is arranged to protrude toward one side of a shaft hole of the rotor body.

3. The permanent magnet assisted synchronous reluctance motor according to claim 2 , wherein the plurality of permanent magnet slots further comprise:
an outer-layer permanent magnet slot located outside the inner-layer permanent magnet slot, wherein a first end of the outer-layer permanent magnet slot and the first end of the inner-layer permanent magnet slot are arranged adjacently, and the first end of the outer-layer permanent magnet slot and an end of the stator tooth formed within both ends of the inner-layer permanent magnet slot are arranged oppositely, a second end of the outer-layer permanent magnet slot and the second end of the inner-layer permanent magnet slot are arranged adjacently, the second end of the outer-layer permanent magnet slot and the stator slot formed within both ends of the inner-layer permanent magnet slot are arranged oppositely, and a middle of the outer-layer permanent magnet slot is arranged to protrude toward one side of the shaft hole of the rotor body.

4. The permanent magnet assisted synchronous reluctance motor according to claim 2 , wherein the rotor body has a first quadrature axis and a second quadrature axis, the first end of the inner-layer permanent magnet slot and the first quadrature axis are arranged adjacently, the second end of the inner-layer permanent magnet slot and the second quadrature axis are arranged adjacently, wherein a distance between a surface of the first end of the inner-layer permanent magnet slot proximate to the first quadrature axis and the first quadrature axis is D 1 , and a distance between a surface of the second end of the inner-layer permanent magnet slot proximate to the second quadrature axis and the second quadrature axis is D 2 , where D 1 >D 2 .

5. The permanent magnet assisted synchronous reluctance motor according to claim 2 , wherein there are a plurality of inner-layer permanent magnet slots, which are arranged at intervals along a radial direction of the rotor body.

6. The permanent magnet assisted synchronous reluctance motor according to claim 1 , wherein an amount of the stator slot is Q, and a pole number of the rotor body is 2P, and a phase number of the permanent magnet assisted synchronous reluctance motor is m, where Q/2P/m=t, tϵ(1.5, 2, 2.5, 3).

7. The permanent magnet assisted synchronous reluctance motor according to claim 1 , wherein the permanent magnet assisted synchronous reluctance motor further comprises:
a permanent magnet disposed within the permanent magnet slot.

8. The permanent magnet assisted synchronous reluctance motor according to claim 1 , wherein there are a plurality of groups of permanent magnet slots, which are arranged at intervals along a circumferential direction of the rotor body, wherein two adjacent groups of permanent magnet slots include a first permanent magnet slot and a second permanent magnet slot adjacent to each other, a first end of the first permanent magnet slot and an end of one of the plurality of stator teeth are arranged oppositely, and a first end of the second permanent magnet slot adjacent to the first end of the first permanent magnet slot and the stator slot formed by the two adjacent stator teeth among remaining stator teeth are arranged oppositely.

9. An electric car comprising a permanent magnet assisted synchronous reluctance motor according to claim 1 .

Assignees

• Gree Electric Appliances Inc Zhuhai

Inventors

• Tan Jianming
• Hu Yusheng
• Chen Bin
• Xiao Yong
• Lu Suhua
• Tong Tong

Classifications

• H02K1/2766 Primary

  having a flux concentration effect · CPC title

• H02K2213/03

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

• H02K29/03

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

• H02K1/24 Primary

  Rotor cores with salient poles {; Variable reluctance rotors} · CPC title

• H02K1/246 Primary

  Variable reluctance rotors · CPC title