A Method for Suppressing Cogging Torque in Permanent Magnet Synchronous Motor Spindle
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摘要: 齿槽转矩引起的转矩脉动会影响永磁同步电主轴电机转矩的平稳性,进而影响加工工件的表面质量。针对传统的工程解析法假设条件多,难以考虑磁路饱和、漏磁和复杂结构等因素,计算结果与工程实际存在较大差距的不足,采用有限元法定量研究了永磁电机定子槽口宽度、斜槽、极弧系数和永磁体偏心距等对齿槽转矩及力能特性的影响规律。揭示了齿槽转矩产生的物理机理,提出了通过优化电机结构参数抑制齿槽转矩的具体策略。研究表明:依据所提策略优化后的电机参数能使永磁电机齿槽转矩显著减小,同时电机的动态特性得到提升。Abstract: The torque stability of a permanent magnet(PM) synchronous motor spindle is affected by the torque ripple caused by cogging torque. The surface quality of work-piece is further affected. The engineering analytical method may lead to big errors between theory and reality because it is assumed that it does not consider magnetic saturation,magnetic flux leakage and complex structure. The finite element method is adopted to study the effects of stator slot width,skewing,pole-arc coefficient and PM offset on cogging torque and motor performance.The physical mechanism of cogging torque is revealed. The method for reducing cogging torque is proposed by optimizing the motor's parameters. The study results show that the method proposed in the paper can reduce cogging torque substantially and improve the dynamic performance.
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