定子永磁型无轴承薄片电机的机理研究  

Research on the mechanism of the stator permanent magnet bearingless slice motor

作　　者：金超武[1] 熊峰 周瑾[1] 杨雄 闫旭 JIN Chao-wu;XIONG Feng;ZHOU Jin;YANG Xiong;YAN Xu(College of Mechanical and Electrical Engineering,Nanjing University of Aeronautics and Astronautics,Nanjing 210016,China)

机构地区：[1]南京航空航天大学机电学院,南京210016

出　　处：《电机与控制学报》2020年第12期17-26,共10页Electric Machines and Control

基　　金：国家自然科学基金(51875275);江苏省重点研发计划(BE2019122);南京航空航天大学研究生创新基地(实验室)开放基金(kfjj20180515)。

摘　　要：针对一种12/4结构的同极性定子永磁型无轴承薄片电机,分析了其定转子结构形式和电机运行原理,在不考虑凸极齿的情况下对该电机的悬浮力和转矩表达式进行了含谐波的理论推导,通过公式推导找到了该电机悬浮力和转矩产生耦合的各相关变量的关系式。研究发现当电机极对数P≥3时,该电机的悬浮力控制与转矩控制可以实现相互解耦,并通过仿真分析验证了该电机具有良好的解耦性能,同时也验证了理论推导的正确性。针对悬浮绕组产生的气隙磁密中谐波所引起的悬浮力波动问题,使用了一种“准正弦”绕组代替三相绕组以优化悬浮力波动,而后分析了“准正弦”绕组的绕制方式,最终研究结果表明使用“准正弦”悬浮绕组相比于使用三相绕组时的悬浮力波动降低了40.09%。Aiming at a 12/4 structure of homopolar stator permanent magnet bearingless slice motor,the stator and rotor structure and the motor operating principle are analyzed.Without considering the salient pole teeth,the motor’s suspension force and torque expressions were derived theoretically with harmonics and the relations between the relative variables of coupling produced by suspension force and torque were found through the formulas derivation.It is found that when the number of motor pole pairs P≥3,the suspension force control and torque control of the motor can be decoupled from each other.The simulation analysis verifies that the motor has good decoupling performance and also verifies the theoretical deduction correctness.Aiming at the suspension force fluctuation problem caused by the harmonics in the air gap magnetic density generated by suspension winding,a“quasi-sine”winding was used instead of the three-phase winding to optimize the suspension force fluctuation and then the“quasi-sine”winding method was analyzed.Final research results show that the use of“quasi-sinusoidal”suspension windings reduces the suspension force fluctuation by 40.09%compared to the use of three-phase windings.

关 键 词：无轴承 定子永磁 薄片电机 解耦控制 悬浮力优化 准正弦绕组 

分 类 号：TM343[电气工程—电机]