基于分段交错梯形磁极的分数槽集中绕组永磁电机局部切向力的削弱  

Reduction of Local Tangential Force of Fractional-Slot Concentrated Winding Permanent Magnet Synchronous Machines with Piecewise Stagger Trapezoidal Poles

作　　者：李泽星 夏加宽[1] 刘铁法 郭志研 鲁冰娜 Li Zexing;Xia Jiakuan;Liu Tiefa;Guo Zhiyan;Lu Bingna(School of Electrical Engineering Shenyang University of Technology,Shenyang 110870,China;Shenyang Institute of Automation Chinese Academy of Science,Shenyang 110169,China)

机构地区：[1]沈阳工业大学电气工程学院,沈阳110870 [2]中国科学院沈阳自动化研究所,沈阳110169

出　　处：《电工技术学报》2023年第6期1447-1459,1485,共14页Transactions of China Electrotechnical Society

基　　金：国家自然科学基金(52077142,52177054);沈阳市中青年科技创新人才支持计划(RC210213)资助项目。

摘　　要：局部切向电磁力波会通过定子齿的杠杆效应引起定子轭部径向振动,其对振动的贡献可以与径向电磁力波比拟。针对分数槽集中绕组永磁电机的局部切向电磁力波,提出了一种分段交错梯形磁极的削弱方法,该方法可在保证电机转矩密度的前提下,有效削弱局部切向电磁力引起的振动。首先,推导了作用于定子齿部的切向集中力模型,并以一台10极12槽永磁电机为例,分析了局部切向电磁力引起振动的原因。然后,基于有限元模型,分析了分段交错梯形磁极对局部切向电磁力的削弱机理,并对比了优化前后电机的径向力波、电磁转矩以及振动频谱。结果表明,分段交错梯形磁极结构对径向力、切向力均有显著的抑制作用。最后,对优化前后的样机进行振动实验,验证了优化方案的有效性。The permanent-magnet synchronous machines(PMSMs)are the most attractive candidates to use as power sources for underwater vehicles due to their inherent high efficiency and high power density.However,as an essential performance for underwater vehicles,concealment is vulnerable to low-frequency vibration and noise caused by PMSMs.The local tangential electromagnetic force is a vital excitation source.For the fractional slot permanent magnet motor,the local tangential electromagnetic force will cause radial vibration of the stator yoke through the lever effect of stator teeth.Its contribution to vibration can be comparable with that of radial electromagnetic force.Therefore,analyzing and weakening the local tangential electromagnetic force is necessary.This paper proposes a weakening method of piecewise stagger trapezoidal poles.The magnetic poles are equally divided into two sections in the axial direction,and the two-section magnetic pole is symmetrically distributed along the axial direction.On each rotor surface,two adjacent magnetic poles in the circumferential direction have opposite polarities,and the axial arrangement is reversed.The center of each magnetic pole of the proposed motor is the same as that of the common motor.The shape of the magnetic pole is similar to the trapezoid.The beveled edge of each magnetic pole is continuously skewed,connecting the short and long sides.Based on the finite element model,the tangential force,tangential moment and main electromagnetic parameters of the common motor without an optimized structure and the proposed motor with the optimized structure are calculated and compared.The tangential force density curves of the two motors are calculated.Compared with the common motor,the peak-to-peak value of the tangential force density is reduced by 20%for the proposed motor.The tangential concentrated force curves and their FFT results of the two motors are calculated.Compared with the common motor,the peak-to-peak value of the tangential concentrated force decreases from 475 N

关 键 词：局部切向电磁力 分数槽集中绕组永磁同步电机 分段交错梯形磁极 有限元模型 

分 类 号：TM351[电气工程—电机]