Study on two feedback linearization control methods for the magnetic suspension system

The technology of magnetic suspension control is one of the key technologies of EMS maglev train. The magnetic suspension system is a typical nonlinear system. Firstly, the nonlinear mathematical model of magnetic suspension system is established on some reasonable assumptions. Secondly, the model can be linearized exactly by means of feedback linearization, and an equivalent linear model was developed. Then, We designed a dynamic compensating linearization controller on the basis of extended state observer. The external disturbance was observed by the extended state observer. The controller can suppress the disturbance effectively through compensating the magnetic suspension system with the observed value. Designing the dynamic compensating linearization controller does not need the system parameters, so it is more realizable than the feedback linearization controller. Finally, the controller basis on the two linearization methods is simulated. The simulation results prove that the dynamic compensating linearization controller has robustness against the external disturbance.