Improvement of Damping Factor by Optimal Shape and Installation Position of the Damper Coils at Low Velocity Range in Electrodynamic Suspension System

Abstract

The electrodynamic suspension system (EDS) realizes stable levitation without the gap control. One of its application is JR Maglev. The EDS system has basically no damping factor against the disturbance. The damping factor is improved by installing the additional coil. However, the damping factor is needed especially at the low velocity. The normal operation velocity in the JR Maglev is the velocity vx = 120[m/sec]. The optimal shape and installation position of the damper coils at the low velocity range such as vx < 80[m/sec] is discussed. The type of the damper coil system and the velocity do not affect the optimal height of the coil. The optimal width of the damper coil in the semi-active system is 8.9% smaller than that in the passive one. The optimal installation position is higher at the low velocity than that at the normal operation velocity in both damper system type. By this optimization, the vertical oscillation is up to 13.6% smaller and the pitching oscillation is up to 11.0% smaller.