Magnetic Damping Method of EDS System Using Power Collection Coil

Abstract

A superconducting magnetically-levitated system is now tested at the Yamanashi Test Line. It is important to obatin a certain level of magnetic damping so as to improve the dynamic characteristics of the system. We have therefore proposed a magnetic damping method using an inductive power collection system and analysed its characteristics assuming a side wall electrodynamic suspension system. The principle of this method is based on the fact that levitation force varies with the phase angle of the induced current in the power collection coils. We can obtain damping force by changing the phase angle in proportion to the velocity of vehicle vibration. We investigated the force which can be used for damping, and evaluated its magnitude and availability by a numerical example. In this example, the vertical force of 3.5kN was obtained per bogie, and a half of this force can be utilized by changing the phase angle up to π/6.