横向磁场磁通反向直线电机的等效磁路模型分析

Analysis of transverse-flux flux-reversal linear motor using equivalent magnetic circuit method

针对横向磁场磁通反向直线电机内部磁场分布复杂、电机设计困难的问题,提出适用于该电机的等效磁路模型,从而提高了电机设计效率。首先,分析该电机的磁路结构,建立电机的磁网络拓扑图,并基于磁路法推导出电机1个最小磁路单元的回路方程组;进而,采用直线段和圆弧作为磁路的近似路径,计算在不同位置时,比磁导的表达式,推导电机电压方程以及推力表达式;最后,为了进一步验证理论分析的正确性,设计并研制了1台实验样机。通过与三维有限元结果、样机实验结果的对比分析,发现所提出的磁路模型计算得到的磁链,比有限元结果高出2.5%,反电势基波幅值比实验结果高出11%,在线性区间内推力计算值与实验结果误差在9%以内。本文所提出的横向磁场磁通反向直线电机的等效磁路模型可以有效地应用在该类电机电磁设计的初步阶段,以确定电机的主要尺寸参数。

To address the complicated magnetic field distribution in the TF-FRLM and the design problem,the equivalent magnetic circuit（EMC）of the transverse-flux flux-reversal linear motor（TF-FRLM）has been proposed in this paper,so that the design efficiency of the motor is improved.Firstly,the distribution of the magnetic field of the TF-FRLM is analyzed,and the topology of equivalent magnetic circuit（EMC）is established.Secondly,the loop equations of an elementary EMC are deduced.And the permeance distribution at each position is calculated by the hypothetic magnetic path of lines and arcs.Finally,aprototype motor is designed and constructed in this paper to validate the proposed model.Comparing with the finite element method（FEM）and experimental results,the winding flux linkage is 2.5% higher than the FEM results.The fundamental back electromotive force（EMF）is 11% higher than the experimental results.The error between calculated thrust force and experimental results is within9%.In general,the proposed EMC of the TF-FRLM is validated in the primary stage of the motor design to determine the leading parameters.