Optimization of asymmetric permanent magnetic synchronous motor for cogging torque minimization using finite element method

Permanent magnetic synchronous motor (PMSM) is often the most important element in precision machine tools as the direct dive motor and also a frequent source of vibration and acoustic noise. So this type of PMSM needs smooth rotation with low cogging torque in order to precise localization. This paper presents a general proposal to optimize the performance of an asymmetric PMSM using finite element method (FEM). A 16-pole 21-slot asymmetric PMSM is chosen to be optimized for minimum cogging torque and high average torque. The effect of different motor dimensions on the cogging torque and torque are discussed.