Optimization and analysis of permanent-magnet synchronous machine with eccentric magnetic pole shape

An analytical model based on subdomain model method is proposed for surface-mounted permanent magnet synchronous machine (SMPMSM) with radial and parallel magnetized eccentric magnetic pole. Further back-EMF, cogging torque and electromagnetic torque is calculated by using this model. This method provides a useful tool to mathematically illustrate the magnets with different circumferential thickness and its accuracy and feasibility have been validated by finite element (FE) method. Finally, particle swarm optimization (PSO) method is used to improve the overall performances of the machine by adjusting the pole shape.