Comparative Study of Winding Configuration on a Multitooth Flux-Switching Permanent Magnet Machine

Abstract

In this paper, based on a 6-stator-coil/17-rotor-tooth (6/17) conventional concentrated-winding multi-tooth flux-switching permanent magnet (C-MFSPM) machine, a novel full-pitch multi-tooth FSPM (FP-MFSPM) machine is proposed by changing winding configurations. Then, the electromagnetic performance of six FP-MFSPM topologies sharing the same 6-stator-coil but with different rotor teeth combinations, namely 6/13, 6/15, 6/17, 6/19, 6/21, and 6/23, is compared by using finite element analysis (FEA). The results show that 6/17 and 6/19 are the optimal stator-coil/rotor-tooth combinations for FP-MFSPM machines, which exhibit better electromagnetic performance, such as more enormous torque and smaller torque ripple. Thereafter, the existing C-MFSPM and the proposed FP-MFSPM machines with 6/17 and 6/19 structures are quantitatively compared in terms of no-load back electro-motive force (back-EMF), air-gap flux density, cogging torque, electromagnetic torque, torque ripple, etc. The FEA-predicted results validate that the proposed FP-MFSPM machines have more sinusoidal back EMF, larger torque output, and smaller torque ripple, which are superior to the C-MFSPM topologies.