Study on Magnetically Coupled Vibration and Control of Electrodynamic Suspension System

为适应未来的高速交通，磁悬浮车辆系统已成为研究热点。研究车辆的动态特性对高速行驶的稳定性、安全性和平顺性具有特别重要的意义。本文研究了采用电动悬架的排斥型磁悬浮系统的动态特性。由于电动悬架本质上是稳定的，但具有低阻尼特性，在悬浮体运动中容易发生机械共振。此外，由于它在导轨上的线圈或薄片中使用导电涡流，所以排斥力受到纵向相邻磁体产生的磁场的影响。研究了铝转盘上方两个独立的永磁体和电磁体之间的磁耦合特性，以及两自由度悬浮体升沉和俯仰运动的动态特性。计算机仿真和实验结果表明，磁体之间的距离对后悬浮间隙和磁刚度有明显的影响，附加主动控制电路可大大提高系统的动态稳定性。

Magnetically levitated (MAGLEV) vehicle systems have been researched for future high speed transportation. It is specially important to investigate dynamic characteristics for running stability, safety and ride quality at high speed. This paper deals with dynamic characteristics of repulsive type MAGLEV systems using electro-dynamic suspension (EDS). As the electrodynamic suspension is inherently stable but of low damping character, mechanical resonance is liable to occur in levitated body motions. Moreover, as it uses conductive eddy current in coils or sheets on guideway, the repulsive force is influenced by magnetic field generated by adjacent magnets located in longitudinal direction. This paper investigates magnetic coupling characteristics between two independent levitated bodies with a permanent magnet and an electromagnet above an aluminum rotating plate and dynamic characteristics of heave and pitch motions of two-degree-of-freedom levitated body running above the plate.The computer simulation and experimental results clearly show that the rear levitation gap and magnetic stiffness are influenced by the distance between the two magnets, and that the dynamic stability is greatly improved by the additional active control circuit.