The low-speed Maglev train adopts single-sided linear induction motors (SLIMs) as traction part. Although the phase winding normally adopts single-branch in order to avoid circulating current caused by longitudinal end effect, the influence of circulating current is not investigated in detail. Thispaper calculates the circulating current and force performance of SLIMs with dual-branch by 3D finite element method (FEM). Firstly, two kind connections of dual-branch phase winding are introduced, called continuous connection or interval connection respectively. Secondly, the circulating current and force performance are obtained at both starting and steady state, and then the effect of circulating current on force performance is deduced. Thirdly, the contribution to force performance by each coil assembly is studied. Finally, the circulating current, force performance and efficiency under different air gap length are analyzed. It is demonstrated that the dual-branch connection has better force performance than single-branch one, but also bigger current unbalance and lower efficiency.

中文翻译：

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低速磁悬浮列车双支相绕组单面线性感应电动机的受力性能

低速磁悬浮列车采用单侧线性感应电动机（SLIM）作为牵引部件。尽管相绕组通常采用单分支，以避免由纵向端部效应引起的循环电流，但是没有详细研究循环电流的影响。本文通过3D有限元方法（FEM）计算双分支SLIM的循环电流和受力性能。首先，介绍了双分支相绕组的两种连接方式，分别称为连续连接或间隔连接。其次，在启动和稳定状态下都获得了循环电流和力性能，然后推导了循环电流对力性能的影响。第三，研究了每个线圈组件对力性能的贡献。最后，循环电流 分析了不同气隙长度下的力性能和效率。结果表明，双分支连接比单分支连接具有更好的受力性能，但电流不平衡更大，效率更低。