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

In this article, based on a 6-stator coil/17 rotor-tooth (6/17) conventional concentrated-winding multitooth flux-switching permanent magnet (C-MFSPM) machine, a novel full-pitch multitooth flux-switching permanent magnet (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 electromotive force (back EMF), air-gap flux density, cogging torque, electromagnetic torque, torque ripple, and so on. 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.