电动汽车不对称转子永磁电机转矩脉动抑制  

Suppression torque ripple of asymmetric rotor permanent magnetmotors for electric vehicle

作　　者：王晓远 王力新 高鹏 李天元 刘双双 WANG Xiaoyuan;WANG Lixin;GAO Peng;LI Tianyuan;LIU Shuangshuang(College of Electrical Engineering and Information,Tianjin University,Tianjin 300072,China)

机构地区：[1]天津大学电气自动化与信息工程学院,天津300072

出　　处：《电机与控制学报》2024年第10期46-54,共9页Electric Machines and Control

摘　　要：针对内置式永磁同步电机转矩脉动大、转子结构复杂优化设计困难的问题,提出一种新型不对称转子结构,该转子结构相邻磁极的极弧系数不同,使得相邻磁极产生转矩脉动相位相反,从而实现对转矩脉动的抑制。首先,从理论上推导了不对称转子结构极弧系数与转矩脉动幅值、相位的关系,并根据理论总结出低转矩脉动不对称型内置式转子结构的设计原则。其次,根据总结的设计原则,设计一台30 kW电动汽车用不对称内置式转子电机并与原样机进行对比分析,对电机的电磁性能进行全面的比较评估。结果表明新型不对称转子结构在不明显影响其他主要电磁性能、不增加电机成本的同时能够有效抑制转矩脉动,转矩脉动下降29.4%。最后,制作通过样机试验验证了理论分析以及仿真的有效性,为内置式永磁同步电机转矩性能的提升提供理论支持。A novel asymmetric rotor structure was proposed to solve the problems of large torque ripple and complex rotor structure optimization design difficulties in interior permanent magnet synchronous motors.The pole arc coefficients of adjacent magnetic poles in the asymmetric rotor structure were different,causing opposite phase of torque ripple generated by adjacent magnetic poles,thereby achieving suppression of torque ripple.Firstly,the relationship between the pole arc coefficient of asymmetric rotor structure and the amplitude and phase of torque ripple was theoretically derived,and the design principles of low torque ripple asymmetric interior rotor structure were summarized based on the theory.Secondly,based on the summarized design principles,an 30 kW asymmetric interior rotor motor was compared and it was analyzed with the original machine to comprehensively evaluate the electromagnetic performance of the motor.The new asymmetric rotor structure can effectively suppress torque ripple,reducing torque ripple by 29.4%.Finally,the effectiveness of theoretical analysis and simulation was verified through prototype experiments,providing theoretical support for improving the torque performance of interior permanent magnet synchronous motors.

关 键 词：内置式永磁电机 转矩脉动 不对称转子 极弧系数 解析分析 电磁设计 

分 类 号：TM301[电气工程—电机]