Design and analysis of a new five-phase brushless hybrid-excitation fault-tolerant motor for electric vehicles

摘要

High reliability and wide range of speed regulation are key factors for motor driving system in electric vehicles (EVs). To meet the requirement for EV application, this paper proposes and investigates a new five-phase brushless fault-tolerant hybrid-excitation (FTHE) motor. First, the single concentrated stator winding is adopted to achieve fault-tolerance. The unequal teeth width and the asymmetric air-gap length are designed to optimize electromagnetic performances, such as back-EMF and torque. In addition, to realize flux-regulation, simple structure and no sliding contacts, based on the utilization of the high-harmonic component of the stator MMF, the rotor field winding and the rotor harmonic winding are designed. Moreover, topology and operation principle of the proposed motor are analyzed. Also, the characteristics of the proposed motor are investigated by using finite-element analysis. Finally, the experimental results are given to verify the validity of the proposed motor.