Rotor’s Mass Unbalance Compensation Control on Bearingless Permanent Magnet Synchronous Motors for Minimizing the Control Currents

The vibration originated from the rotor’s unbalance mass impacts on the current oscillation. When the rotor rotating at high speed, power amplifier circuit will be burned down by excessive vibration control current, and at the same time the excessive control force will be generated. The vibrating force transfers to frame, which causes the system vibration and influence the dynamic properties and safe operation. So unbalance compensation on the rotating machine is necessary, especially for the high speed bearingless motor. Based on introductions of the rotor motion equation of bearingless permanent magnet synchronous motor (BPMSM) and analysis on generation mechanism of unbalance force, feed-forward compensation controller is designed on the technology of adaptive notch filter in this paper. The control system is simulated with Matlab/Simulink toolbox. The simulation results have shown that the current oscillation can be minimizing by the controller, and vibrating force is eliminated with the rotor rotating around inertia center. Copyright © 2014 IFSA Publishing, S. L.