永磁同步电机转子表面辅助槽对齿槽转矩的影响研究  

Effect of rotor surface auxiliary slot on cogging torque of PMSM

作　　者：张泽豫 焦志勇[1] 夏洪兵[2] 赵鹏[1] 苏仕见 ZHANG Ze-yu;JIAO Zhi-yong;XIA Hong-bing;ZHAO Peng;SU Shi-jian(School of Mechanical Engineering,Tianjin University of Science and Technology,Tianjin 300222,China;Automotive Engineering Research Institute,China Automotive Technology and Research Center Co.,Ltd.,Tianjin 300300,China)

机构地区：[1]天津科技大学机械工程学院,天津300222 [2]中国汽车技术研究中心有限公司汽车工程研究院,天津300300

出　　处：《机电工程》2019年第12期1342-1346,共5页Journal of Mechanical & Electrical Engineering

基　　金：国家自然科学基金资助项目(81471274)

摘　　要：针对永磁同步电机存在的齿槽转矩过高引起的电机振动噪声问题,对转子表面辅助槽结构进行了优化。通过永磁同步电机齿槽转矩产生的原理,分析了转子结构对电机齿槽转矩的影响,探讨了转子表面辅助槽结构与电机齿槽转矩的关系,并进行了推导归纳;利用有限元软件搭建了8极48槽内置式永磁同步电机模型,以该内置式永磁同步电机模型为载体,通过改变气隙磁密谐波分量,采用多目标遗传算法计算出了辅助槽个数、位置和深度3个设计变量的最优解,得到了辅助槽结构的最佳设计方案。研究结果表明:采用优化后的转子表面辅助槽结构,可以有效降低内置式永磁同步电机的齿槽转矩,增加气隙磁密基波幅值,降低了5次和7次谐波幅值,使齿槽转矩峰值降低了76.2%,并且保证电机性能不降低。Aiming at the vibration and noise problem of permanent magnet synchronous motor caused by high cogging torque, the structure of auxiliary slot on rotor surface was optimized. Through the principle of permanent magnet synchronous motor cogging torque, the influence of rotor structure on motor cogging torque was analyzed, and the relationship between the structure of the auxiliary slot on the rotor surface and the cogging torque of the motor was discussed. A permanent magnet synchronous motor model with 8 poles and 48 slots was built by finite element method. With the built-in permanent magnet synchronous motor model as the carrier, by changing the air gap flux density harmonic component, multi-objective genetic algorithm was used to calculate the optimal solution of the number, position and depth of the auxiliary slot, and the optimal design scheme of the auxiliary slot structure was obtained. The results indicate that the cogging torque of the built-in permanent magnet synchronous motor can be effectively reduced by using the optimized rotor surface auxiliary slot structure and increase the amplitude of air-gap magnetic dense basis, and reduce the amplitude of 5 th and 7 th harmonics. The peak torque of the cogging slot is reduced by 76.2%, and the motor performance is not reduced.

关 键 词：永磁同步电机 转子表面辅助槽 齿槽转矩 气隙磁密 有限元分析 

分 类 号：TM351[电气工程—电机]