磁齿轮电机具有转矩密度高、转子结构坚固的特点。针对外转子辐条式磁齿轮电机齿槽转矩高等问题，以一台三相18槽28极外转子辐条式磁齿轮电机作为研究对象，利用磁场调制理论对气隙进行解析计算，然后基于麦克斯韦张量法分析外转子辐条式磁齿轮电机齿槽转矩产生的机理，并通过调节槽口角度和转子削角对磁齿轮结构进行优化。有限元分析结果表明，优化后电机的反电动势三次谐波被削弱了53%、齿槽转矩幅值被削弱了93.4%、输出转矩脉动下降了73.7%。有限元分析结果验证了调节槽口角度和转子削角的结构优化方法的有效性。

Magnetic gear motor has the characteristics of high torque density and strong rotor structure. To solve the problem of high cogging torque of external rotor spoke magnetic gear motor, a three-phase 18-slot 28-pole external rotor spoke magnetic gear motor is taken as the research object. The air gap is calculated analytically using the magnetic field modulation theory, and then the mechanism of cogging torque of the external rotor spoke magnetic gear motor is analyzed based on Maxwell tensor method. The magnetic year structure is optimized by adjusting the groove angle and rotor cutting angle. The finite element analysis results show that the third harmonic of the oplimized motor′s back electromotive force is reduced by 53%, the amplitude of cogging torque is reduced by 93.4%, and the output torque ripple is reduced by 73.7%. The finite element analysis results verify the effectiveness of the structural optimization method by adjusting the groove angle and rotor cutting angle.