An Enhanced Electromagnetic Rail Propulsion Design Based on Current Self-Guiding

During electromagnetic rail propulsion (ERP), the induced electromagnetic field generated by the pulse current is not uniformly distributed over the armature. The nonuniform distribution of Lorentz forces reduces the armature life and effectiveness of ERP. Present optimizations mainly focus on enhancing propulsion effectiveness by additional elements while the nonuniform distribution problems still exist. In this study, a current self-guided design is proposed for an enhanced ERP system. A multiphysics field-coupled finite element simulation model of ERP was constructed. By comparing the magnetic field and current distribution, key parameters, such as depth and shape, that influence the effectiveness of current guidance are analyzed. The current self-guided ERP device in its final form significantly improves the armature surface magnetic field and force uniformity. The enhanced ERP device armature speed increased by 25%. The results show that propulsion effectiveness and armature magnetic field uniformity can be improved under the same excitation conditions. The mechanical life of the ERP device is improved.