Minimum copper loss fault-tolerant control of redundant flux-switching permanent-magnet motors

Abstract

Redundant flux-switching permanent-magnet (PM) (R-FSPM) motor is a new fault-tolerant machine having PMs in the stator. Due to its high power density, high reliability and easy cooling in magnets, this motor is a good candidate for electric vehicle (EV) applications. This paper proposes a new remedial control strategy for fault-tolerant operation of the R-FSPM motor drive, in which the copper loss is minimized. When the amplitudes of the remaining phases of the faulty motors are the same value, the reduced torque during fault can be remedied with minimum copper loss. The proposed remedial operation is compared with the existing one by analyzing the torque ripple and the copper loss. Finite-element analysis (FEA) is resulted, confirming that the proposed remedial operation can offer the acceptable torque performance and minimize the copper loss during the loss of one coil.