When a magnetic levitation rail carrying a superconducting coil moves at high speed, an electromagnetic induction voltage is generated in the surrounding telecommunication line due to Faraday's electromagnetic induction. This phenomenon is analyzed by AC/DC module of COMSOL multiphysics. The telecommunication line is modeled for a common mode flowing in a loop between the telecommunication line and the ground. As a result, we devise a method to calculate the induced voltage to the telecommunication line loop by differentiating in position the position dependency of the superconducting coil with respect to the magnetic flux linking the telecommunication line loop. In addition, to confirm the validity of the calculation method in COMSOL, we compare flux linkages for a model on the ground surface and a model in the complete free space, and also compare the results calculated with MATLAB by modeling with a lumped constant circuit and the results calculated with COMSOL.

中文翻译：

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MAGLEV列车对通信线路电磁感应的有限元分析方法

当携带超导线圈的磁悬浮轨道高速移动时，由于法拉第的电磁感应，在周围的通讯线路中会产生电磁感应电压。COMSOL多物理场的AC / DC模块对此现象进行了分析。电信线路是为在电信线路和地面之间的环路中流动的共模建模的。结果，我们设计了一种方法，该方法通过相对于链接电信线路环路的磁通量在位置上区分超导线圈的位置依赖性来计算到电信线路环路的感应电压。另外，为了确认COMSOL中计算方法的有效性，我们比较了地面模型和完整自由空间模型中的磁链，