ACTIVE VIBRATION CONTROL OF ELECTRODYNAMIC SUSPENSION SYSTEM

Magnetically levitated (MAGLEV) vehicle systems have been researched f or future high-speed transportation. It is especially important to inv estigate their dynamic characteristics from the viewpoint of running s tability, safety and ride quality at high speed. This paper deals with repulsive-type MAGLEV systems using electrodynamic suspension (EDS). Although the EDS is inherently stable, the damping force is not large enough to suppress the vibration excited by guideway irregularities an d other disturbances. Therefore, this paper investigates theoretically and experimentally the damping force control of EDS systems with a hy brid magnet configuration of a permanent magnet and an additional elec tromagnet of which the current is compensated by a feedback control lo op. The dynamical characteristics are analyzed by an experimental setu p in which a one-degree-of-freedom mass is suspended above an aluminum rotating plate. According to the experiment, the damping coefficient is significantly increased by the additional control circuit.