Abstract
Cogging torque and torque ripple of permanent magnet synchronous motor is one of the main concerns in design. And weakening harmonics of air-gap flux density and back electromotive force is a significant way to reduce cogging torque and torque ripple. In this paper, an outer-rotor surface-mounted permanent magnet synchronous motor (SPMSM) with permanent magnets of reverse step shape (SPMSM-RS) is designed and optimized. Compared with conventional SPMSM (CSPMSM) and that with permanent magnets of step shape (SPMSM-S), the motor of this model has fewer harmonics of air-gap flux density and fewer leakage fluxes by 2-D finite-element analysis method. Finally, the proposal model is optimized by genetic algorithm, with respectively minimum total harmonics distortion (THD) of no-load back electromotive force (EMF) and minimum torque ripple on rated operation as objective functions. The result shows that the model by optimizing no-load back EMF has a good performance with fewer harmonics of back electromotive force. And the model by optimizing torque ripple has a good performance with fewer torque ripple.
Published Version
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