For active magnetic bearing systems using differential displacement sensors

sensor assembly errors and rotor vibrations can cause offset or rotation between the center of the displacement detection coordinate system and the control system coordinate system

resulting in time-varying errors.To this end

the system model of sensor errors is studied and a method for identification and compensation is proposed.The error signal in the sensor is identified and compensated using a adaptive least mean square(LMS)filter and a polar coordinate search method.Finally

simulations and experiments are used to verify the effectiveness of the proposed strategy in suppressing rotor vibrations.