轴向磁通无铁心永磁电机多层矩形扁线绕组涡流损耗解析计算及优化  

Analytical Calculation and Parameter Optimization of Eddy Current Loss for Coreless Axial Flux Permanent Magnet Synchronous Machine with Multilayer Flat Wire Winding

作　　者：王晓光[1] 尹浩 余仁伟 Wang Xiaoguang;Yin Hao;Yu Renwei(Hubei Engineering Research Center for Safety Monitoring of New Energy and Power Grid Equipment Hubei University of Technology,Wuhan 430068,China;RAYGET Power Generation Technology(Wuhan)Co.Ltd,Wuhan 430073,China)

机构地区：[1]湖北工业大学新能源及电网装备安全监测湖北省工程研究中心,武汉430068 [2]锐革机电(武汉)有限公司,武汉430073

出　　处：《电工技术学报》2023年第12期3130-3140,共11页Transactions of China Electrotechnical Society

基　　金：湖北省教育厅科学技术研究计划重点资助项目(D20201407)。

摘　　要：轴向磁通无铁心永磁电机的定子为无铁心结构,采用扁线绕制的定子绕组盘,具有槽满率高、平整度好、加工简单等特点。但是相对于圆形导线,矩形扁线具有截面积较大、涡流损耗大的缺点,导致电机损耗偏高、效率偏低。该文根据轴向无铁心电机磁场的三维分布特性,针对矩形扁线涡流损耗分布不均匀的特点,推导了定子无铁心扁线绕组特有的涡流损耗快速计算方法。在此基础上,基于涡流损耗的产生机理并以绕组铜耗最小为优化目标,建立了扁线绕组最优参数的求解公式。采用三维有限元软件仿真及样机测试的方法,验证了涡流损耗解析计算方法的有效性和准确性。结果表明,该文提出的涡流损耗计算公式以及导线参数优化方法可以实现扁线绕组的低损耗及电机的高效率,所得结论可为轴向无铁心电机定子绕组的设计及优化提供理论依据。Coreless axial flux permanent magnet synchronous machine(CAFPMSM)is increasingly used in industrial applications due to its advantages such as compact structure,low maintenance cost,high power density,high torque ratio,and power efficiency.Preformed flat wire has a relatively regular shape,which is adopted in CAFPMSM winding manufacturing because it can make full use of stator space and increase the power density of the machine.Since the coreless winding is directly exposed to the air gap flux field,the large across section of the flat wire will result in significant eddy current losses and will be more serious when the speed goes higher.Therefore,it is important to calculate the eddy current losses of the winding accurately.Some valuable methods have been presented to calculate the eddy current loss of the traditional round winding,but they are unsuitable for CAFPMSM with flat wire.This paper derives the formula specific to flat wire for the uneven distribution of eddy current losses generated by the air gap flux field.According to the theoretical analysis of eddy current loss and taking the minimum copper loss as the optimization objective,the solution of the optimal parameters of flat wire is established.The calculation formula and parameter optimization method can reduce the eddy current loss and improve efficiency.Firstly,the distribution characteristics of both the flux field in the axial direction and circumferential direction have been analyzed.Secondly,the amplitude of leakage flux density between the two adjacent permanent magnets is approximately linear with the position in the axial direction.The amplitude of the leakage flux density in different positions can be expressed in terms of the distance in the axial direction.The eddy current loss produced by the leakage flux can be calculated.Thirdly,the amplitude of the main flux density waveform can be expressed by the average value,simplifying the calculation of the eddy current loss produced by the main flux.Finally,the theoretical analysis method has

关 键 词：无铁心永磁电机 扁线绕组 涡流损耗 绕组优化 

分 类 号：TM351[电气工程—电机]