Frequency-doubling displacement disturbance suppression of active magnetic bearing based on repetitive control

During the operation of the magnetic bearing motor, due to mechanical manufacturing processing technology, it will lead to a disturbance of the same frequency and multiple frequency in the control system. Typical active magnetic bearing (AMB) control system is generally Proportional Integral Derivative (PID) control. PID control has limited effect on suppressing this type of disturbance. However, the repetitive controller (RC) can make the original closed-loop stabilization system track this type of disturbance and then realize the displacement vibration suppression effect. In this paper, an AMB control system with RC is designed to suppress this type of disturbance. Compared with the traditional AMB control system, this control system has a better inhibition effect on disturbance of the same frequency and multiple frequency in the control system.