电动电磁混合磁浮悬浮稳定性及技术特性分析

针对EDS(electro-dynamic suspension)型磁浮系统自振较大的不足，研究一种EDS和EMS(electro-magnetic suspension)混合作用的磁浮技术。基于该系统的动力学模型，利用劳斯判据进行悬浮稳定性分析，结果表明，纯粹的EDS 系统是临界稳定的，而引入EMS 后即使对其不施加主动控制作用，只要EDS 悬浮力达到一定比重即可实现稳定。通过选取4种典型情况进行数值计算，验证了所给稳定条件的正确性。论文还对混悬系统的技术特性进行分析，指出EMS 部分既可完全利用车载永久磁铁实现，亦可再辅以零功率控制线圈来提供更好的主动阻尼。所增加的EMS 控制器的体积重量功耗小、部件少、无需通过冗余来保障安全，且对轨道的精度要求低。EDS 和EMS 混合磁浮技术可以发挥二者的优点而克服各自的不足，具有潜在应用前景。

Analysis of Levitation Stability and Technology Characters of EDS and EMS Hybrid Maglev

The electro-dynamic suspension(EDS) and electro-magnetic suspension(EMS) hybrid maglev technology was investigated to decrease the vibration of EDS system. The Routh criterion was applied to analyze the levitation stability of the dynamic maglev model. The results show that the EDS system is critical stable, and if the electro-dynamic levitation force exceeds a certain ration, the hybrid system becomes stable after adding an EMS system even without active control. The stable conditions were numerically verified under four kinds of typical situations. Researching on the characters of the hybrid system indicates that the EMS can be realized by permanent magnets or hybrid magnets (PM and electromagnet) drove by zero-power control coil, which can increase the active damping greatly. The additional EMS controller has some advantages such as lighter weight, smaller power consumption, lower demand to the guideway precision and more reliable without redundancy design, etc. The EDS and EMS hybrid maglev system, which can retain the merits and overcome the limits of EDS or EMS system separately, has a broad perspective in the future.