Control of a magnetic levitation system using non-linear robust design tools

In this paper we present different non-linear design tools applied on a Magnetic Levitation system for elevation control under the presence of parametric uncertainties and perturbations. The system in view is inherently highly unstable and requires the application of Robust Control techniques to stabilize the system at desired heights or use in tracking applications. Several non-linear State Feedback and Robust design methods were applied on the system and as a special case a robust Output Feedback control was developed using High Gain Observer to recover the performance of the state feedback controller. The simulations presented show the results and effectiveness of different design techniques.