Compensation Strategy for Mechanical Cross-coupling in Magnetic Levitation PMSM System to Reduce Radial Displacement

Considering the mechanical coupling, the displacement cross-coupling control is applied to the magnetic levitation PMSM system operating. The proposed approach effectively restrains levitation displacement, and the control algorithm is simple to implement. The stability margin of multi-input multi-output system is evaluated by the singular value method of system return difference matrix, which verifies that the stability of the proposed algorithm is better. Finally, simulation and experimental results show that the displacement fluctuation can be reduced by a minimum of 15%, at the resonance frequency.