模块组合式定子永磁电机边端力分析及削弱方法  

Research on end cogging force and weakening method of PMSM with module combination stator

作　　者：张炳义[1] 贾宇琪[1] 冯桂宏[1] 

机构地区：[1]沈阳工业大学电气工程学院,辽宁沈阳110870

出　　处：《电机与控制学报》2015年第4期40-45,52,共7页Electric Machines and Control

基　　金：国家自然科学基金项目(51177106);国家重大科学仪器设备开发专项(2012YQ05024207)

摘　　要：针对低速大功率电机过大的体积给其制造、运输、装配和维护带来困难以及可靠性低等问题,提出一种采用不等跨距绕组的模块组合式定子永磁电机结构,实现定子的模块化制作,增强电机的可靠性和容错性。为了提高模块组合式定子永磁电机运行的平稳性和控制精确度,分析其力矩波动的来源,指出由相邻定子模块之间装配、固定及维修所需的缝隙引起的定子边端磁导突变是边端力产生的主要根源,利用Schworz-Christistoffel变换法求取了电机定子模块边端处的气隙磁场分布,有限元分析结果验证了选用方法的合理性。最后对边端力进行了求解,并采用优化定子模块宽度和定子模块铁心轴向错位结构两种方法对合成边端力进行了削弱研究。仿真结果表明了两种方法对于削弱定子模块边端力的有效性。Aiming at the large volume of low-speed and high-power machine bringing the problems of manu-facturing, transportation, installation and maintenance difficulties, a permanent magnet synchronous ma-chine with module combination stator based on unequal span winding was proposed. This structure achieves modular manufacturing of low-speed and high-power machine, and enhances the manufacturing flexibility, operation reliability, maintenance and fault tolerance. In order to improve the operation stability and con-trol precision of permanent magnet synchronous machine with combination stator, the sources of torque rip-ple was analyzed and module stator end magnet conductivity mutation was the main origin of end cogging force was pointed out. By adopting Schworz-Christistoffel transform method, the air-gap magnetic field dis-tribution of the module stator end was calculated, and finite element analysis results verified its rationality. Finally, the end cogging force was solved, and the weakening of synthesis of end cogging force was studied by two methods of optimizing the module stator width and module stator axial dislocation structure. The simulation results show the effectiveness of reducing end cogging force of two methods above.

关 键 词：模块组合式定子 永磁电机 边端力 优化 削弱 

分 类 号：TM351[电气工程—电机]