Research on the Influence of Vibration Response of Permanent Magnet Motor under Harmonic Current

Due to the function of chopper circuit of frequency converter, the harmonic current will be produced in the process of inverter. This paper mainly studies the influence of harmonic current with different order and amplitude on the vibration response of permanent magnet synchronous motor. First of all, based on the current waveform under variable frequency power supply, combined with theoretical analysis, the order harmonics are determined. Secondly, the harmonic current injection method is used to analyze the influence of low order harmonic current on the vibration response of the motor. The simulation results show that the low order harmonic current can reduce the vibration response of the motor to a certain extent. Finally, the accuracy of the vibration calculation method is verified by the vibration test of an experimental prototype.