定子电励磁型磁通切换电机的绕组构成分析与功率密度优化设计
Winding Configurations Analysis and Power Density Optimization of Stator Electrical Excitation Flux-Switching Machine
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摘要: 定子电励磁型磁通切换(stator electrical excitation flux-switching,SEEFS)电机由于其定、转子结构简单,制作成本低,调速范围宽,振动噪声小等优点而逐渐被应用到电动汽车、轨道交通等领域,有着广阔的发展前景。以混合动力汽车车载低压直流辅助发电系统为背景,基于24/14极SEEFS电机提出了一种针对定子电励磁型同步磁阻(stator electrical excitation synchronous reluctance,SEESR)电机绕组构成原则的通用分析方法——虚拟绕组磁链法,该方法在SEEFS电机每个定子齿上补充一套辅助分析的虚拟绕组,通过对各个虚拟绕组磁链的分析,归类和组合,准确构成设计所需的三相或多相绕组;此方法可以针对任意极槽配合以及任意励磁绕组排布方式的SEESR电机进行分析,并得出其相应的绕组构成形式。同时,针对低压直流应用场合,采用了一种具有非平行齿槽的电机优化模型,该模型具有更高的功率密度。有限元分析和样机实验证明了设计方案的可行性和正确性。Abstract: Because of the simple structures of stator and rotor, low cost, wide speed range and small vibration and noise, the stator electrical excitation flux-switching(SEEFS) machine is gradually being applied to the areas of electric car and rail transit etc., which has wide prospects for development. In the background of low voltage DC auxiliary power generation system on the hybrid vehicle, an approach of the virtual winding flux linkages was proposed based on 24/14 poles SEEFS machine, which was a general analysis method for winding configurations of stator electrical excitation synchronous reluctance(SEESR) machines. This method supplemented a set of auxiliary virtual windings on each stator tooth of SEEFS machine. By analyzing, classifying and combining the flux linkages of each virtual winding, the windings were accurately designed to be three-phase or multi-phase. Furthermore, this analysis method was suitable for these SEESR machines with different slot and pole number combinations and field winding configurations. Meanwhile, an optimization model with non-parallel cogging was proposed for low voltage DC applications, which had higher power density. The finite element analysis and experiments of prototype machine verify the feasibility and correctness of the design scheme.