Motor, power system, control method, and electric vehicle

Patent metadata

Field	Value
Publication number	US-12401246-B2
Application number	US-202217878368-A
Country	US
Kind code	B2
Filing date	Aug 1, 2022
Priority date	Jul 31, 2020
Publication date	Aug 26, 2025
Grant date	Aug 26, 2025

Abstract

An electric motor, a power system, a control method, and an electric vehicle. The electric motor comprises a first N-phase winding set and a second N-phase winding set, wherein the first N-phase winding set and the second N-phase winding set are both used for being connected to a traction battery by means of a conversion module. When the traction battery starts to be heated, the first N-phase winding set and the second N-phase winding set are powered on. The direction of a magnetic field generated by the first winding set and the direction of a magnetic field generated by the second winding set have a phase difference, such that the magnetic fields counteract each other; and a magnetic field intensity in a stator winding of each phase is reduced, and an air-gap magnetic flux is also reduced, thereby alleviating the problems of electric motor heating and electric motor NVH.

First claim

What is claimed is:

1. A motor, comprising: an N-phase first winding set and an N-phase second winding set, wherein N is a positive integer, and the motor is configured to provide a current through the first winding set and the second winding set to heat a traction battery; and
when the motor heats the traction battery, the first winding set and the second winding set are energized, and a phase difference is caused between a direction of a magnetic field generated by the first winding set and a direction of a magnetic field generated by the second winding set, and a total magnetic flux of the magnetic fields generated by the first winding set and the second winding set is within a preset magnetic flux threshold range, and the preset magnetic flux threshold range is less than any one of a magnetic flux of the magnetic field generated by the first winding set and a magnetic flux of the magnetic field generated by the second winding set;
the first winding set and the second winding set provide current to the traction battery after being energized, and the current passes through an internal resistance of the traction battery to generate heat to heat the traction battery.

2. The motor according to claim 1 , wherein the motor comprises a plurality of stator slots, and the first winding set and the second winding set are located in the same stator slot.

3. The motor according to claim 2 , wherein the first winding set is located at the bottom of the stator slot, and the second winding set is located at the opening of the stator slot.

4. The motor according to claim 1 , wherein the motor comprises a plurality of stator slots, and the first winding set and the second winding set are located in adjacent stator slots.

5. The motor according to claim 1 , wherein a phase difference between a current to the first winding set and a current to the second winding set is within a preset phase threshold, and an amplitude difference therebetween is within a preset amplitude threshold.

6. An electric vehicle, comprising a power system, wherein the power system comprises a traction battery, a conversion module, and the motor according to claim 1 .

7. A power system, comprising a traction battery, a conversion module, and a motor;
wherein the motor, comprising: an N-phase first winding set and an N-phase second winding set, wherein N is a positive integer, and the motor is configured to provide a current through the first winding set and the second winding set to heat the traction battery;
when the motor heats the traction battery, the first winding set and the second winding set are energized, and a phase difference is caused between a direction of a magnetic field generated by the first winding set and a direction of a magnetic field generated by the second winding set, and a total magnetic flux of the magnetic fields generated by the first winding set and the second winding set is within a preset magnetic flux threshold range, and the preset magnetic flux threshold range is less than any one of a magnetic flux of the magnetic field generated by the first winding set and a magnetic flux of the magnetic field generated by the second winding set;
the first winding set and the second winding set provide current to the traction battery after being energized, and the current passes through an internal resistance of the traction battery to generate heat to heat the traction battery;
wherein a direct current side of the conversion module is connected to positive and negative electrodes of the traction battery, a first alternating current side of the conversion module is connected to the first winding set, and a second alternating current side of the conversion module is connected to the second winding set.

8. The power system according to claim 7 , wherein the motor comprises a plurality of stator slots, and the first winding set and the second winding set are located in the same stator slot.

9. The power system according to claim 8 , wherein the first winding set is located at the bottom of the stator slot, and the second winding set is located at the opening of the stator slot.

10. The power system according to claim 7 , wherein the motor comprises a plurality of stator slots, and the first winding set and the second winding set are located in adjacent stator slots.

11. The power system according to claim 7 , wherein a phase difference between a current to the first winding set and a current to the second winding set is within a preset phase threshold, and an amplitude difference therebetween is within a preset amplitude threshold.

12. The power system according to claim 7 , wherein the conversion module comprises a three-leg inverter;
wherein a direct current side of the three-leg inverter is connected to the positive and negative electrodes of the traction battery, an alternating current side of the three-leg inverter is connected to the first winding set, and a switch assembly is connected between the alternating current side of the three-leg inverter and the second winding set.

13. The power system according to claim 7 , wherein the conversion module comprises two three-leg inverters;
wherein direct current sides of the two three-leg inverters are both connected to the positive and negative electrodes of the traction battery, an alternating current side of one three-leg inverter is connected to the first winding set, and an alternating current side of the other three-leg inverter is connected to the second winding set.

14. The power system according to claim 7 , wherein the conversion module comprises a six-leg inverter, and the six-leg inverter comprises two alternating current sides;
wherein a direct current side of the six-leg inverter is connected to the positive and negative electrodes of the traction battery, one alternating current side of the six-leg inverter is connected to the first winding set, and the other alternating current side of the six-leg inverter is connected to the second winding set.

15. The power system according to claim 7 , wherein neutral points of the second winding set are connected to neutral points of the first winding set.

16. A heating control method, wherein the method is applied to the power system according to claim 6 , and the power system comprises a motor, an inverter, and a traction battery; the method is performed by a motor controller unit; and the method comprises:
receiving a cell temperature of the traction battery and operating state information of the motor;
in a case of a heating condition is met based on the cell temperature and the operating state information, causing the traction battery to energize a first winding set and a second winding set, and causing a phase difference between a direction of a magnetic field generated by the first winding set and a direction of a magnetic field generated by the second winding set, wherein a total magnetic flux of the magnetic fields generated by the first winding set and the second winding set is within a preset magnetic flux threshold range;
in a case of a heating condition is not met based on the cell temperature and the operating state information, causing the traction battery to energize the first winding set and the second winding set to make the motor output power, wherein a total magnetic flux of the magnetic fields generated by the first winding set and the second winding set is within a preset magnetic flux threshold range, or causing the motor to stop working.

17. The method according to claim 16 , wherein the inverter comprises a switch assembly; and the energizing a first winding set and a second

Assignees

• Contemporary Amperex Technology Hong Kong Ltd

Inventors

• Huang Xiaojian
• Zuo Xiyang
• Dan Zhimin
• Li Bao

Classifications

• H02K11/30

  Structural association with control circuits or drive circuits · CPC title

• H02P25/22

  Multiple windings; Windings for more than three phases · CPC title

• B60L50/51

  characterised by AC-motors · CPC title

• B60L58/27

  by heating · CPC title

• B60H1/143

  the heat being derived from cooling an electric component, e.g. electric motors, electric circuits, fuel cells or batteries · CPC title