Mathematical Model Optimization of Electromagnetic Suspension System Based on Additional Constraints

This paper optimizes mathematical model of the electromagnetic suspension system (EMS) by introducing voltage, current and airgap constraints. The model order is reduced using cascade control theory and PID controller parameters given with the method of pole placement. Then, an ideal simulation model (ISM) and an optimization simulation model (OSM) of suspension system are set up based on matlab/simulink. The simulation results show that OSM's output current is always positive in various working conditions. Moreover, the current ripple in every switch period can be obtained from the waveforms, which is consistent with actual working condition of the system. So, the OSM can not only simulate system's static and dynamic states well, but also reflect performances of the maglev chopper. Finally, the experiment waveforms are given and compared with simulation results of two models. The results show that the OSM can simulate real system better than the ISM.