Novel dual-airgap axial field fault-tolerant flux switching permanent magnet machines with high torque performance

Abstract

In recent years, flux switching permanent magnet machines (FSPMMs) have been comprehensively investigated for various applications [1]-[2]. In particular, the axial field FSPMMs are attracting much attentions due to the incorporation of the advantages of FSPMMs and axial filed permanent magnet (PM) machines, which offer the merits of high torque/power density, high efficiency, compact construction and good heat dissipation [3]. However, the axial field FSPMMs generally exhibit high cogging torque and torque ripple resulting from the double salient structure and high airgap flux density by the flux focusing effects, while it is necessary to reduce the pulsating torques for high-performance applications such as servo motors and direct-drive wind power generators [4]. Furthermore, the FSPMMs show good potentials to be in-wheel direct drive motors, wherein the fault-tolerant capability is always essential to be further improved to spread them for transportation applications [5]. © 2015 IEEE.