带闭合无源线圈的单铁悬浮系统性能研究

Research on the Performance of Single Magnet Suspension System with Closed Passive Coil

减小系统超调是控制系统设计的目标之一。通过调节控制参数,可以减小超调。在电磁铁加入无源线圈,悬浮间隙变化使无源线圈产生感应电流,该感应电流是否能够阻碍稳定悬浮状态下间隙变化的趋势,增大系统阻尼,达到减小超调的效果?文中研究了加入闭合无源线圈对单铁悬浮系统动态性能的影响。根据实际系统,建立以磁感应强度为状态变量的单铁悬浮模型,计算结果表明感应电流响应控制电流的变化,阻碍了控制系统对悬浮体的调节,无法起到增加阻尼的作用。利用Simulink仿真得到悬浮体运动过程中间隙、磁通、电流及能量的变化情况,对仿真结果的分析证明了数学模型的有效性。

Reducing the overshoot is one of the purposes the control system is designed for.The overshoot can be reduced by choosing right parameters.If there is a passive coil around the electromagnet,the change of levitation gap will generate the induction current around the passive coil.Whether the induction current can resist the change of gap when the suspension suspending stably and increase the damp of the system to reduce the overshoot？ The effect on the dynamic performance of the single magnet suspension system with closed passive coil is researched in this paper.Based on the practical system,the model of single suspension magnet is established with magnetic induction as state variable,the computed result indicates that the induction current responds the change of the control current and counteracts the control to suspension by the control system,also it can＇t increase the damp of the system.Using software Simulink,the change of gap, flux density,current and energy in the process of suspension moving are obtained by simulating,the analysis of the result validates the efficiency of the mathematical model.