Comparison study of rare-earth-free motors with permanent magnet motors in EV applications

Abstract

Four topologies of in-wheel motors, including three switched reluctance motors and one permanent magnet synchronous motor of the same dimension, are proposed for comparison in electric vehicle applications. The three switched reluctance motors are 6/4, 6/10 and 6/16 two-teeth structures, respectively, along with the permanent magnet synchronous motor topology of 12 stator slot and 8 poles. The parameters of the motors are optimized for the best torque performance through genetic algorithm. The comparison contains torque output, iron loss and efficiency. Consequently, the results demonstrate 6/16 two-teeth switched reluctance topology is a potential candidate for electric vehicle applications.