Rotor’s mass unbalance compensation control in bearingless permanent magnet-type motors for minimizing the currents

The vibration originated from the rotor´s unbalance mass impacts on the current oscillation. As the rotor rotating at high speed, Power amplifier circuit will be burned down by excessive control current. While 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 introducing of the rotor motion equation of bearingless PSMS 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 show that the current oscillation can be minimizing by the controller, and vibrating force is eliminated, while the rotor rotates around inertia center.