Demagnetization control method and device for permanent magnet synchronous motors, electric vehicles and storage media
By acquiring the stator current, voltage, and rotor angular velocity of the motor, the motor flux linkage and inductance are determined, the output torque is calculated, and the motor current is allocated. This solves the problem of intensified demagnetization caused by untimely demagnetization control in permanent magnet synchronous motors, thereby improving the motor's service life and safety.
CN115296579BActive Publication Date: 2026-05-26WEICHAI POWER CO LTD +1
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Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Patents(China)
- Current Assignee / Owner
- WEICHAI POWER CO LTD
- Filing Date
- 2022-09-05
- Publication Date
- 2026-05-26
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Figure CN115296579B_ABST
Abstract
This invention discloses a method, apparatus, electric vehicle, and storage medium for demagnetizing a permanent magnet synchronous motor. The method includes: when the permanent magnet synchronous motor demagnetizes, determining the current degree of motor demagnetization based on the current motor flux linkage and the D-axis and Q-axis inductances of the motor inductance; when the current degree of motor demagnetization exceeds a demagnetization threshold, determining the motor's output torque based on the current stator current, the current motor flux linkage, the D-axis inductance, and the Q-axis inductance; and redistributing the motor current on the D-axis and Q-axis based on the output torque and the motor's required torque, thereby mitigating the demagnetization process and achieving motor demagnetization control.
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