基于不同绕组形式双定子低速大转矩永磁直驱电机转矩脉动的分析与抑制  

Analysis and Mitigation of Torque Ripple of a Dual-Stator Low-Speed High-Torque Permanent Magnet Machine with Different Winding Forms

作　　者：刘佶炜 狄冲[1] 李仕豪 鲍晓华[1] Liu Jiwei;Di Chong;Li Shihao;Bao Xiaohua(School of Electrical Engineering and Automation,Hefei University of Technology,Hefei,230009,China)

机构地区：[1]合肥工业大学电气与自动化工程学院,合肥230009

出　　处：《电工技术学报》2024年第12期3646-3657,共12页Transactions of China Electrotechnical Society

基　　金：国家自然科学基金资助项目(51977055)。

摘　　要：双定子低速大转矩永磁直驱电机(DLHPMDM)具有高转矩密度和高效率等优点,是传统低速大转矩传动系统的良好替代方案。DLHPMDM可以看作由内、外两台电机构成的整体。绕组形式选择不仅直接影响内、外电机的转矩性能,内、外电机不同绕组形式的组合还会改变内、外电机输出转矩的叠加效果,最终影响DLHPMDM的转矩脉动水平。首先,基于双定子电机的转矩叠加原理,提出一种抑制DLHPMDM转矩脉动的设计方法,采用解析法分析内、外电机反电动势谐波相位差如何影响纹波转矩的叠加效果,并对内定子采用不同绕组形式时DLHPMDM的转矩性能进行仿真分析和初步验证。其次,考虑到绕组谐波引起的谐波电流对转矩脉动的影响,采用以电压源为激励的有限元分析进一步验证了内、外电机选用合理的绕组形式组合时,内、外电机纹波转矩的叠加削减作用能够有效降低DLHPMDM的转矩脉动。最后,采用转矩脉动最低的设计方案试制了一台DLHPMDM样机并完成相关实验,实验结果验证了分析的准确性。By incorporating the merits of the high torque density,high efficiency,and compact size,the dual-stator low-speed high-torque permanent magnet drive machine(DLHPMDM)is an excellent alternative to the traditional machine in low-speed high-torque applications.For dual-stator machines,the total output torque equals the output torque superposition of inner and outer machines,namely the torque superposition principle of dual-stator machines.This principle can explain the mechanism of reducing the torque ripple of the dual-stator permanent magnet machines.Changing the pole-slot number combination is a crucial method to reduce the torque ripple of machines.However,in analyzing and mitigating torque ripple for the DLHPMDM,considering the inner and outer machines alone needs to be revised and more accurate.More attention should be paid to the superposition reduction effect of inner and outer torque ripple resulting from different phases.The combination number of inner and outer stator slots can affect the torque ripple of the DLHPMDM.Based on the torque superposition principle of dual-stator machines,a design method is proposed to reduce the torque ripple of the DLHPMDM with the inner and outer windings connected in parallel.Generally,the 6th ripple torque accounts for the largest proportion of the torque ripple of permanent magnet machines.Suppose the phase difference between the 6th ripple torque of the inner and outer machines is close toπ.In that case,the superposition reduction effect can be achieved,thereby reducing the total torque ripple of the DLHPMDM.When only considering the situation where the fundamental sinusoidal current is passed through the stator windings,the 6th ripple torque is caused by the following two cases.One is the interaction of the fundamental current and the 5th harmonic of the back EMF.The other is the interaction of the fundamental current and the 7th harmonic of the back EMF.The fundamental phases of the inner and outer stator currents are approximately the same.Therefore,when the DLHPMDM

关 键 词：双定子永磁直驱电机 绕组形式 转矩叠加原理 纹波转矩 转矩脉动 

分 类 号：TM351[电气工程—电机]