Permanent magnet auxiliary synchronous reluctance motor and electric vehicle provided with same

Patent metadata

Field	Value
Publication number	US-11799333-B2
Application number	US-201816976942-A
Country	US
Kind code	B2
Filing date	Dec 7, 2018
Priority date	Mar 16, 2018
Publication date	Oct 24, 2023
Grant date	Oct 24, 2023

Abstract

A permanent magnet auxiliary synchronous reluctance motor includes a stator portion and a rotor portion. The stator portion includes a stator core and a winding embedded in the stator core. The stator core is provided with a stator tooth and a stator slot. The rotor portion is provided inside the stator portion; a rotor body of the rotor portion is provided with a plurality of permanent magnet slot groups which are evenly arranged along a circumferential direction of the rotor body; each of the permanent magnet slot groups is provided with multiple layers of permanent magnet slots; a distance between end portions of adjacent permanent magnet slots between adjacent permanent magnet slot groups is less than or equal to a width of a stator tooth boot of the stator tooth, and the number of slots per pole and per phase of the motor is two or three.

First claim

The invention claimed is:

1. A permanent magnet auxiliary synchronous reluctance motor, comprising:
a stator portion comprising a stator core and a winding embedded in the stator core, the stator core having a stator tooth and a stator slot; and
a rotor portion disposed in the stator portion, wherein a rotor body of the rotor portion is provided with a plurality of permanent magnet slot groups, the plurality of permanent magnet slot groups are evenly arranged along a circumferential direction of the rotor body, each of the permanent magnet slot groups is provided with multiple layers of permanent magnet slots, a distance between an end portion of a permanent magnet slot in a permanent magnet slot group and an end portion of an adjacent permanent magnet slot in an adjacent permanent magnet slot group is less than or equal to a width of a stator tooth shoe of the stator tooth, and a number of the permanent magnet slots per pole and per phase of the motor is two or three;
wherein a permanent magnet slot group comprises an outer layer of permanent magnet slot and an inner layer of permanent magnet slot, a magnetic conduction channel is formed between the outer layer of permanent magnet slot and the inner layer of permanent magnet slot, the inner layer of permanent magnet slots of two adjacent permanent magnet slot groups are arranged adjacently;
wherein the plurality of permanent magnet slot groups comprise a first permanent magnet slot group, the first permanent magnet slot group comprises a first inner layer of permanent magnet slot and a first outer layer of permanent magnet slot, a first magnetic conduction channel is formed between the first inner layer of permanent magnet slot and the first outer layer of permanent magnet slot;
wherein an end portion of the outer layer of permanent magnet slot and an end portion of the inner layer of permanent magnet slot are both disposed toward the outer edge of the rotor body, and magnetic isolation bridges having an equal width are formed between the outer layer of permanent magnet slot and the outer edge of the rotor body, and between the inner layer of permanent magnet slot and the outer edge of the rotor body;
wherein a distance from an end portion of the first outer layer of permanent magnet slot to the outer edge of the rotor body is H, a width of the end portion of the first outer layer of permanent magnet slot is M, and a width of the magnetic isolation bridge is H1, satisfying 0.4×M≤(H−H1)≤2×M.

2. The permanent magnet auxiliary synchronous reluctance motor of claim 1 , wherein a distance between end portions of adjacent inner layer of permanent magnet slots is less than or equal to a width of the stator tooth.

3. The permanent magnet auxiliary synchronous reluctance motor of claim 2 , wherein the plurality of permanent magnet slot groups further comprise a second permanent magnet slot group, the second permanent magnet slot group comprises a second inner layer of permanent magnet slot and a second outer layer of permanent magnet slot, a second magnetic conduction channel is formed between the second inner layer of permanent magnet slot and the second outer layer of permanent magnet slot; a third magnetic conduction channel is formed between a portion of the first inner layer of permanent magnet slot and a portion of the second outer layer of permanent magnet slot.

4. The permanent magnet auxiliary synchronous reluctance motor of claim 3 , wherein the first permanent magnet slot group further comprises:
a first slot bent relative to the first inner layer of permanent magnet slot, wherein a first end of the first slot is in communication with a first end of the first inner layer of permanent magnet slot, a second end of the first slot extends toward an outer edge of the rotor body; the first bent slot has a first cut edge; a first end of the first cut edge is connected to a side wall of the first inner layer of permanent magnet slot adjacent to the first outer layer of permanent magnet slot; a second end of the first cut edge is arranged to extend toward the outer edge of the rotor body and gradually away from the first outer layer of permanent magnet slot; the second end of the first cut edge is connected to a side wall of the first bent slot extending along a circumferential direction of the rotor body.

5. The permanent magnet auxiliary synchronous reluctance motor of claim 4 , wherein the second permanent magnet slot group further comprises:
a second slot bent relative to the second inner layer of permanent magnet slot, wherein a first end of the second slot is in communication with a first end of the second inner layer of permanent magnet slot; the first slot is disposed adjacent to the second slot; a second end of the second slot extends toward the outer edge of the rotor body; the second slot has a second cut edge; a first end of the second cut edge is connected to a side wall of the second inner layer of permanent magnet slot adjacent to the second outer layer of permanent magnet slot; a second end of the second cut edge is arranged to extend toward the outer edge of the rotor body and gradually away from the second outer layer of permanent magnet slot; the second end of the second cut edge is connected to a side wall of the second bent slot extending along the circumferential direction of the rotor body; a distance between the second end of the first cut edge and the second end of the second cut edge is LA, a width of the stator tooth shoe is LC, satisfying LA≤LC.

6. The permanent magnet auxiliary synchronous reluctance motor of claim 5 , wherein the first permanent magnet slot group further comprises:
a third bent slot, wherein a first end of the first bent slot is in communication with a second end of the first inner layer of permanent magnet slot; a second end of the third bent slot extends toward the outer edge of the rotor body; the third bent slot and the first bent slot are disposed symmetrically with respect to a direct axis of the first permanent magnet slot group; a first angle is formed between a geometric center line of the first bent slot or the third bent slot and a geometric center line of the first inner layer of permanent magnet slot in a length direction.

7. The permanent magnet auxiliary synchronous reluctance motor of claim 6 , wherein the second permanent magnet slot group further comprises:
a fourth bent slot, wherein a first end of the fourth bent slot is in communication with a second end of the second inner layer of permanent magnet slot; a second end of the fourth bent slot extends toward the outer edge of the rotor body; the fourth bent slot and the second bent slot are disposed symmetrically with respect to a direct axis of the second permanent magnet slot group; a second angle is formed between a geometric center line of the second bent slot or the fourth bent slot and a geometric center line of the second inner layer of permanent magnet slot in a length direction.

8. The permanent magnet auxiliary synchronous reluctance motor of claim 5 , wherein the first permanent magnet slot group further comprises:
a fifth bent slot, wherein a first end of the fifth bent slot is in communication with a first end of the first outer layer of permanent magnet slot; a second end of the fifth bent slot extends toward the outer edge of the rotor body; and the fifth bent slot is disposed adjacent to the first bent slot.

9. The permanent magnet auxiliary synchronous reluctance motor of claim 8 , wherein the second permanent magnet slot group further comprises:
a sixth bent slot, wherein a first end of the sixth bent slot is in communication with a first end of the second outer layer of permanent magnet slot; a second end of the sixth bent slot extends toward the outer edge of the

Assignees

• Gree Electric Appliances Inc Zhuhai

Inventors

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

Classifications

• H02K1/276 Primary

  Magnets embedded in the magnetic core, e.g. interior permanent magnets [IPM] · CPC title

• H02K21/14

  with magnets rotating within the armatures · CPC title

• H02K29/03 Primary

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

• H02K2213/03

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

• H02K1/246 Primary

  Variable reluctance rotors · CPC title