Stable Levitation in the Low Velocity Range With the Damper Coils in Electrodynamic Suspension System

The electrodynamic suspension (EDS) is applied to levitation and guidance of the high speed magnetically levitation system. Numerical simulations show that the damping factor of the EDS system is small. Once vertical oscillation of the bogie occurs by the external disturbance, it does not converge immediately. Thus, the damper coil system is installed to increase the damping factor of this EDS system against oscillation of the bogie. The semiactive damper system is introduced to improve the levitation stability. As the application of the EDS system, this article discusses about the JR Maglev system. At low operation velocity, the damping factor is small, and it is difficult to keep the levitation stability. In this article, running simulation of the bogie when the bogie passes the displacement at the low velocity is undertaken. The velocity limit for stable levitation in the EDS system with the damper coils is discussed. From the results, in the case of at low velocity and large displacement, the damping factor is not enough to keep the stable levitation. By improving the control method of the semiactive damper system, the bogie keeps the stable levitation.