虚拟气隙在轴向磁通永磁电机三维有限元计算中的应用研究  

Application and Research of Virtual Air Gap in Three Dimensional Finite Element Analysis of Axial Flux Permanent Magnet Machines

作　　者：毕云龙 柴凤[1] 裴宇龙[1] BI Yunlong;CHAI Feng;PEI Yulong(School of Electrical Engineering and Automation,Harbin Institute of Technology,Harbin 150001,Heilongjiang Province,China)

机构地区：[1]哈尔滨工业大学电气工程及自动化学院,黑龙江省哈尔滨市150001

出　　处：《中国电机工程学报》2021年第6期1929-1936,共8页Proceedings of the CSEE

摘　　要：轴向磁通电机的结构特点导致其难以进行二维有限元建模和计算,三维有限元计算又较为耗时。该文提出虚拟气隙,并将其应用于轴向磁通电机三维有限元模型中,通过改变气隙材料的相对磁导率,实现在有限元模型中任意改变气隙长度,进而更灵活地控制网格剖分。对比采用实际气隙和虚拟气隙的电机气隙磁密和反电势,结果表明采用虚拟气隙可以实现在保证计算精度的同时,缩短计算时间。虚拟气隙的引入为轴向磁通电机三维有限元计算提供了新思路。Thanks to the complex structure of axial flux permanent magnet(AFPM) machine, 2 dimensional finite element analysis(2D FEA) is hard to be employed. 3D FEA is precise but very time-consuming. A virtual air gap was proposed and adopted in the 3D FEA of AFPM machines in this paper. The virtual air gap will be achieved by changing the length and relative permeability of the actual air gap. In this way, the length of air gap can be random selected and the mesh of air gap is flexible. The air-gap flux density and back electromotive force(EMF) of machines were calculated and compared to show the influence of virtual air gap and mesh setting. The results show that the adoption of virtual air gap can reduce the mesh elements and accelerate the solving process. Meanwhile, the accuracy of results can be guaranteed by the control of mesh setting. The adoption of virtual air gap gives new ideas of 3D FEA of AFPM machines.

关 键 词：轴向磁通电机 三维有限元 虚拟气隙 磁通密度 

分 类 号：TM351[电气工程—电机]