Research on cogging torque of disk motor based on stator structure optimization
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摘要: 齿槽转矩会恶化电机性能，为削弱盘式永磁电机齿槽转矩，文章提出了定子偏移和不等定子齿靴两种结构优化方法。首先通过能量法与傅里叶分解推导出轴向电机齿槽转矩公式，进行定子槽口宽度优化得到原模型的最小齿槽转矩；然后用公式推导计算与有限元分析，得到定子偏移结构的偏移角度；最后通过理论分析和仿真计算得到基于最小齿槽转矩的不等定子齿靴扩张宽度比，不等定子齿靴结构可使定子上下两侧的齿槽转矩相互抵消。对比结果表明，不等定子齿靴结构对齿槽转矩削弱效果最好，当扩张宽度比取1.2时，齿槽转矩降低71%。Abstract: In order to weaken the cogging torque of disk permanent magnet motors, two structural optimization methods of stator offset and unequal stator boot are proposed. The cogging torque formula of axial motor is derived by energy method and Fourier decomposition, and the minimum cogging torque of the original model is obtained by optimizing the width of the stator groove. Then, the offset angle of the stator offset structure is obtained by calculating and finite element analysis. Finally, through theoretical analysis and simulation calculation, the expansion width of the stator gear boots based on the minimum cogging torque is obtained, and the unequal stator gear boots structure can make the stator’s upper and lower cogging torque cancel each other. The comparison results show that the unequal stator boot structure has the best effect on the reduction of cogging torque. When the expansion width is 1.2, the cogging torque is reduced by 71%.
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Key words:
- cogging torque /
- axial flux motor /
- stator offset /
- unequal stator tooth boot
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表 1 盘式电机基本参数
参数 数值 极数 10 槽数 12 额定转矩/（N·m） 14.6 额定功率/kW 5.6 额定转速/（r/min） 3600 电机外径/mm 104 电机内径/mm 58 气隙长度/mm 1.5 永磁体厚度/mm 5 
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表 2 优化定子结构结果对比
传统
结构定子偏移
结构不等定子
齿靴结构空载相反电势有效值/V 215.5 213.5 213.1 齿槽转矩峰峰值/（N·m） 0.95 0.34 0.28
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