Magnetic Damping Characteristics of the Superconducting Magnetic Levitation

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To investigate magnetic damping characteristics of the superconducting EDS (Electrodynamic suspension) magnetically levitated system and their influence on running performance and riding comfort, we have analyzed damping characteristics of the most essential levitation system structure, the feasibility of a passive and an active damper for the improvement of damping characteristics and their performance, and in addition we have made running simulations with a bogie model.1.Running simulation : Numerical simulation of six-degree-of-freedom motion of the superconducting magnetically levitated bogie was carried out using analysis programs we have been developing to study running characteristics under various conditions : running along a straight and a curved section, multi-bogie models, superconducting coil quench, etc. The results show us the bogie motion in detail, in particular, the importance of the rotational motion of the bogie when full characteristics are considered, and how mechanical dampers influence it.2.Damping mechanism : To clarify the damping mechanism in detail only vertical motion of the bogie was considered and analyzed on the basis of an energy balance. The dependence of the damping characteristic on the electromagnetic force, induced current, coil resistance and inductance was demonstrated.3.Passive damper : To improve the damping characteristics electromagnetically the installation of short-circuited coils in the vehicle was considered and the influence of the coil position and size was analyzed.4.Active damper : An active damper, where the damper coil current is controlled actively was investigated, The results show that it can improve the damping more effectively than a passive coil. The shape, the size and position of active damper coils were proposed.