基于改进子域模型的双绕组无轴承磁通切换电机磁场解析计算  

Analytical calculation of magnetic field of dual-winding bearingless flux-switching permanent magnet motors based on improved subdomain model

作　　者：崔征山 周扬忠 周祎豪 CUI Zheng-shan;ZHOU Yang-zhong;ZHOU Yi-hao(Fujian Key Laboratory of New Energy Generation and Power Conversion,Fuzhou University,Fuzhou 350108,China)

机构地区：[1]福州大学福建省新能源发电与电能变换重点实验室,福州350108

出　　处：《电机与控制学报》2022年第3期66-77,共12页Electric Machines and Control

基　　金：福建省自然科学基金(重点)(2021J02023)

摘　　要：针对双绕组无轴承磁通切换永磁电机的复杂结构,通过建立一种改进的子域模型来分析电机电磁特性。对于悬浮绕组采用分布式双层绕组嵌放方式,提出了一种等效电流分析方法,将上、下层绕组电流等效为同一电流元。与传统子域模型中分布式双层绕组分析法相比,所提改进子域模型法可减少求解变量的个数,将未知参数矩阵从22阶简化到18阶,降低了磁场计算的复杂程度。考虑实际电机铁心材料具有非线性,提出一种考虑磁饱和的相对磁导函数补偿方法,将定、转子齿部的饱和磁阻近似等效为对应齿前气隙磁阻的增加量,通过等效增大电机气隙长度来间接反应铁心的饱和状况。之后,依据电机磁动势守恒原则,推导出线性与非线性条件下的气隙磁密解析关系。最后,利用有限元法和样机实验验证本文所提方法的有效性。An improved subdomain model was established to calculate the electromagnetic performance of the complex structure of dual-winding bearingless flux-switching permanent magnet motor(BFSPMM). An equivalent current analysis method was proposed for suspension winding with the distributed double-layer windings of dual-winding BFSPMM. The upper and lower winding currents are equivalent to the same current element. Compared with the distributed double-layer windings analysis method in the traditional sub-domain model, the improved sub-domain model method proposed can reduce the number of unknown coefficients and reduce the complexity of the magnetic field calculation, the unknown parameter matrix can be simplified from order 22 to order 18. According to the non-linear characteristics of the actual motor core material, a relative permeability function compensation method considering magnetic saturation was proposed. The saturated magnetic resistance of the stator and rotor teeth is equivalent to the increase in air gap magnetic resistance. The saturation of the iron core is indirectly reflected by equivalently increasing the air gap length of the motor. Then, according to the conservation principle of magnetomotive force, the relationship of air gap flux density under the linear and nonlinear conditions was derived. Finally, the validity of the proposed method is verified by finite element method and prototype experiment.

关 键 词：双绕组无轴承磁通切换永磁电机 改进子域模型 分布式双层绕组 等效电流 相对磁导函数补偿法 磁动势守恒 

分 类 号：TM315[电气工程—电机]