Vibration Suppression Based on Phase Shift Notch Filter for Bearingless Motor Rotor Mass Unbalance System

Synchronous vibration, resulting from rotor mass imbalance, significantly impacts the operational performance of bearingless motor (BM). To address this issue, a full compensation strategy of vibration is proposed to suppress the synchronous vibration force. Firstly, the motion model of the rotor under imbalance vibration is derived, and the mechanism of synchronous vibration is revealed. A phase shift notch filter is a common choice to suppress vibration. Furthermore, based on the common strategy where the synchronous current is minimized, a feed-forward compensation is presented to eliminate the residual vibration force caused by displacement stiffness. The synchronous vibration is fully compensated. Finally, based on a 5000rpm/150W experimental BM, sufficient simulation verifies the effectiveness and superiority of the proposed strategy.