Harmonic Vibration Suppression of AMB Rotor Based on VSS Repetitive Controller Considering Mass Imbalance and Sensor Runout

The rotor mass imbalance and sensor runout will cause the harmonic vibration of active magnetic bearing system. Repetitive control (RC) can effectively eliminate periodic disturbances. When the vibration frequency fluctuates, the performance of conventional repetitive control (CRC) becomes worse, and it is difficult to deal with the situation that the ratio of fundamental period to sampling period is a fraction. Therefore, the virtual sampling second-order repetitive control (VSSRC) is designed. Virtual sampling can ensure that the ratio of the fundamental period to the sampling period is an integer without changing the physical sampling frequency. The second-order repetitive control (SRC) can enhance the robustness of the system and maintain a good suppression effect even when the frequency fluctuates. The experimental results of AMB system show that the suppression effect of VSSRC is better than that of CRC when the frequency fluctuates. This research on the micro-vibration of the rotor is of great significance and application value.