Hybrid Odd Repetitive Controller for Magnetically Suspended Rotor System

Odd-harmonic current induced by mass unbalance and sensor runout in magnetic bearing coil current of magnetically suspended rotor (MSR) system will cause harmonic vibration. In this paper, a hybrid odd repetitive controller (HORC) is proposed to suppress harmonic current in MSR system. On one hand, frequency robustness of the proposed algorithm is better than that of conventional repetitive controller when the fundamental frequency of harmonic current is fluctuant around the nominal value of rotation frequency. On the other hand, the dynamic response is also accelerated. Meanwhile, a stability criterion is presented to prove the stability of MSR system. The proposed algorithm has good potentials for MSR system. Simulation results verify the effectiveness of the proposed method.