Fault Analysis and Optimization of Rotary Transformer of Drive Motor for a Pure Electric Vehicle
The new energy vehicle market has become an important part of China's automobile market,and solving the safety problems of new energy vehicles has become an important basis and premise for determining the high-quality development of the auto industry.In the pure electric vehicle drive motor system,the rotary transformer is used to detect the rotor position and speed of the drive motor,which is often affected by electromagnetic interference,power-on timing,grounding loop,and wiring harness direction,especially in the process of high-voltage power-on,the vehicle's control system misjudges the motor fault,thus triggering the safety protection mechanism,causing the vehicle to be unable to drive.This paper uses the method of changing the resistance of the power module of the main control board of the motor controller to deal with the decoding circuit of the rotary transformer.After the change,the switching loss is reduced and the power-on establishment time is increased.It is proved that the optimization scheme can solve the false alarm of the rotary transformer during the power-on process.