Analyzing and modeling of dynamic magnetic suspension plate in the electromagnetic launcher

Electromagnetic launch assisted with electromagnetic suspension (EMS) can horizontal launch instead of vertical, it can also achieve non-contact friction. But the eddy current induced in non-laminated steel accelerator track, which is directly concerned with launching speed, can not be neglected in high-speed launching, which can reduce the suspension force between the electromagnets and track, and even affects the control of the air gap length. This paper analyzes the eddy current by using 3-D finite element firstly, and obtains a fitting equation of electromagnetic force at high speed approximately. And then we develop the dynamic mathematical model of magnetic suspension platform by using the Lagrangian approach. To verify the dynamic model, we design a variable universe adaptive fuzzy controller with speed compensation, and the simulation results are give accordingly, which indicates that the developed dynamic model with launching speed is feasible.