Cogging Torque Analysis of Flux-Switching Permanent Magnet Motor

A novel doubly salient permanent magnet motor named flux switch permanent magnet motor (FSPM) was designed and analyzed. The stator and rotor of FSPM are all salient structures. There are a marked verge domino effect and serious saturation phenomenon. Due to high nonlinearities of FSPM, finite element method (FEM) was used to analyze magnetic field distribution, permanent magnet flux linkage, electromotive force, inductances, cogging torque and so on. The sizes of and air gap length are two most obvious factors, which influence the torque. Higher cogging torque harms the static and dynamic characteristics when the motor works normally. These two aspects were analyzed particularly by FEM. The relationships of cogging torque with permanent magnet width and air gap length were presented which gives some constructive results and advice for motor design.