Levitation Control of Doubly-Fed Linear Motor with Multi-Phase AC Excitation on Mover

Different from the Transrapid (TR) series maglev that achieves the levitation control with DC excited mover, the stable levitation control of doubly-fed linear motor (DFLM) with multi-phase AC excited mover is achieved in this paper. AC levitation, as opposed to DC levitation, exhibits similarities but possesses more uniqueness. In this paper, the principle of the inherent pitch torque of AC levitation is investigated and a feasible control method to compensate the pitch torque is proposed. The effectiveness of the proposed control method is validated through simulation studies.