Equivalent Model of the Side Wall Electrodynamic Suspension System

Abstract

The side wall electrodynamic suspension (EDS) system has the advantage of not requiring gap control, and the magnetic drag is smaller than for the repulsive arrangement. This levitation system is applied in the JR magnetically levitated (Maglev) transportation system. From the experimental results in the Miyazaki test line, this system has large damping. However calculation results shows this system has little damping, and reason of large damping in the test line is not clearly shown. So running characteristics and improved design can be investigated using numerical analysis to improve riding comfort and reduce loss of the superconducting magnet. As this is non-linear system, complicated analysis is needed. Usually running characteristics of this EDS system is given from the numerical analysis which combines electromagnetic phenomena with mechanical movement equation. However this method requires very large calculation times. So more simple suspension model of this EDS system is needed. This paper shows levitation and guidance characteristics of this system, and develops the equivalent suspension system model from the electric circuit characteristics of this system. The approximation is developed by a simple function of the velocity and position of the bogie. The dynamic movement of the bogie was calculated using this model easily, and the results corresponds to the results given by the electric circuit model.