Study of magnetic stiffness and effect on running stability in high speed train propelled by superconducting linear synchronous motor

초록

In this study, hybrid typed high speed train which has wheels on rail system for running and superconducting linear synchronous motor(SC-LSM) for propulsion is introduced. By utilizing contactless powerful SC-LSM, this train could overcome the limitation of adhesion between wheel and rail, and therefore, achieve higher speed than traditional wheel-rail train. Also, this train has advantages such as the interoperability with existing rail network and simple guideway structure, which is superior to traditional maglev. In SC-LSM propulsion, by adjusting force angle, normal force perpendicular to thrust direction could be generated. And magnetic stiffness caused by this normal force influences on lateral and yaw directional dynamics which mainly determines maximum speed limit. In this study, firstly, magnetic stiffness caused by SC-LSM propulsion is inspected both theoretically and experimentally. Then, train dynamic model including magnetic stiffness is developed and through various simulations, the effect of magnetic stiffness on running stability is analyzed.