Cogging torque suppression of surface-mounted and interior hybrid PMSM by magnet shifting method

This paper proposed the cogging torque analytical models of the surface-mounted and interior hybrid PMSM (SIHPMSM) with different magnetization patterns based on its structure. The optimization methods of cogging torque under whole and single magnetic pole migration were derived by analyzing the corresponding magnet shifting cogging torque analytical formulas. The finite element method was applied to calculate the cogging torque of SIHPMSM with different magnetization patterns when there was magnetic pole migration. Then the results were compared with those of prototype test and the cogging torque optimization method was determined,which was verified by comparing the results such as back-EMF,electromagnetic torque,torque ripple,efficiency and other performance parameters of the original, and optimized SIHPMSM.