Adaptive Current-Loop Design for an ElectroMagnetic Suspension System

In this paper, the performance of the traditional linear current-loop strategy of a single-point Electromagnetic suspension system is analyzed and its disadvantages in application is pointed out. It is concluded that the time constant of the resultant voltage-current subsystem varies as the changes of the suspension states, which will destroy the condition of implementing model reduction by the method of current-loop and bad performance of the suspension system occurs in return. To guarantee the performance of the current-loop strategy, an adaptive current-loop is designed, the parameters of which can be adjusted automatically according to the suspension states of the system. Experimental results verify disadvantages of traditional current-loop strategy. And simulation is conducted to evaluate the performance of the proposed adaptive current-loop algorithm, the results of which illustrate that consistent performance can be obtained under different conditions of the suspension states, and it has better robustness compared with the traditional current-loop strategy.