Numerical Calculation of Magnetic–Thermal Coupling and Optimization Analysis for Velocity Skin Effect

In this article, the explicit finite difference method is used to solve the magnetic–thermal coupling phenomenon of velocity skin effect (VSE), and the skin effect phenomenon at different velocities is analyzed. In order to reduce the VSE between the armature and the rail, the skin effect phenomena of the layered rail with graphite coating, the layered armature with Ti Mo Al metal, and the combined structure of the layered rail and the layered armature were studied, respectively. The results show that with the increase of velocity, the VSE gradually appears in the armature and rail, and the layered rail can weaken the adverse effect of the VSE. Although the layered armature can weaken the VSE, the physical properties of Ti Mo metal will cause the local temperature of the armature tail to be too high. Through the combination with the layered rail, the high temperature of the armature tail caused by the layered armature can be significantly improved.