Full Compensation Strategy for Synchronous Vibration Suppression of BPMSM

Synchronous vibration, arising from rotor mass unbalance, profoundly affects the levitation performance of bearingless permanent magnet slice motor (BPMSM). While the conventional phase shift notch filter (PSNF) is integrated into the BPMSM levitation control system, a critical trade-off is needed to be solved between the accuracy and responsiveness of the levitation system. Despite the adoption of PSNF, there are still vibration forces caused by displacement stiffness in BPMSM levitation system. To address these issues, firstly, the rotor levitation dynamics model under the unbalance vibration and vibration force model are created. The coupling vibration of levitation and torque systems is analyzed. Then, a full vibration compensation strategy based on the improved PSNF is proposed to suppress the synchronous vibration force in full speed domain. On one hand, taking the current decay rate as the target, an optimal phase shift angle search strategy is proposed to enhance dynamic response while preserving system accuracy. On the other hand, a feedforward compensation method is presented to eradicate residual vibration force. Through this approach, synchronous vibration is effectively suppressed. Finally, employing a 5000rpm/150W experimental BPMSM, the efficacy and superiority of the proposed strategy are validated through extensive simulations and experiments.