Principle analysis of torque ripple test bench for electric machine for electric vehicle application

The torque ripple is mainly caused by the interaction between the stator magnetomotive force of the motor and the magnetomotive force harmonic of the rotor. With the gradual improvement of the comfort and stability requirements of the passenger car, the vibration and noise of the drive motor for the electric vehicle and ripple impact and other indicators affecting the comfort of the vehicle are receiving more and more attention. On the basis of ensuring the output torque capability of the motor, further improving the quality of the motor is one of the important purposes of the project research. At present, the research on the motor torque ripple measurement method is not perfect, and the motor test equipment cannot eliminate the interference of the load fluctuation on the motor torque test and cannot be accurately measured. In this paper, the load dynamometer and elastic coupling by simulating the input and output torque are studied, angular velocity and angular acceleration on the basis of previous research on torque ripple test at home and abroad. The influence of load dynamometer and elastic coupling on the test structure is studied and the test system of no-load dynamometer and elastic coupling is determined.