Stability Analysis And Experimental Research Of A Flywheel Supported By Active Magnetic Bearings

Gyroscopic effects of a flywheel rotor supported by active magnetic bearings greatly influence system stability. Effectively damping the rotor nutation is a challenge for the controller designs of the system. To improve rotational speeds of the rotor, how a PD controller and phase lag factors changed the dynamics and the stability of the rotor in operation was studied. With the phase lag factors in the closed-loop system, effects of the cross feedback control on the nutation stability were studied too. Some simulation results and experiment results are provided. It is shown that the phase lag factors and the PD controller greatly influence the nutation frequency value of the closed-loop system. The real damping of the nutation becomes poor and the nutation frequency increases to near a double-synchronous frequency when the rotor runs at high rotational speeds. Sensor runout signals can excite the nutation vibration and make the rotor unstable. In controller designs, the nutation resonance peak of the closed-loop system near double-synchronous frequency should be avoided. At the same time, the sensor runout signals should be restrained.