关键词: 齿槽转矩, 极槽配合, 田口法, 输出转矩, 转矩波动

Abstract: The cogging torque is a critical factor that causes motor vibration,noise,and degradation of output torque stability. Therefore,the study of cogging torque suppression is an important issue that cannot be ignored in the design of permanent magnet synchronous motors ( PMSMs) . This article focuses on the optimization design of external rotor PMSM, aiming to minimize cogging torque while enhancing torque performance. The electromagnetic characteristics of various poleslot combinations were comparatively evaluated. A multi-parameter finite element optimization model was established, including pole-arc coefficient, permanent magnet thickness, stator tooth arc, and stator tooth-tip thickness. A Taguchi orthogonal array was employed for experimental design, and multi-objective optimization was achieved through main-effect analysis of response means complemented by analysis of variance to identify significant factors. The results show that, compared to the initial design, the optimized motor achieves an 18. 5% increase in average output torque and a 32. 6% reduction in torque ripple, demonstrating the effectiveness of the proposed approach in improving electromagnetic performance and operational stability.

Key words: cogging torque, pole-slot combination, Taguchi method, output torque, torque ripple