Abstract:The multi-frequency interference signal of the sensor and the control system influences each other, which easily leads to the micro vibration of the magnetic bearing rotor. In order to suppress the micro vibration of the magnetic bearing caused by the multi-frequency interference of the sensor at high speed, this paper firstly builds the control system model of the magnetic bearing considering the multi-frequency interference of the sensor, and analyzes the internal mechanism of the harmonic of the displacement sensor and the micro vibration of the control system. Secondly, it proposes an automatic balancing control method of the magnetic bearing based on the multi-frequency adaptive notch filter to eliminate or suppress the same frequency or double frequency reaction force of the bearing, so that the electromagnetic force generated by the sensor's harmonic disturbance is attenuated. The simulation results show that when the speed is 30000 (r/min), the vibration force related to the harmonic interference of the sensor can be suppressed to a certain extent by adopting the automatic balance control method.