Uncertainty Structure and u-Design of a Magnetic Suspension System

This paper deals with modeling, structured uncertainties, /x-analysis and synthesis of a magnetic suspension system. First we derive a nominal model of the plant and consider its structured uncertainties e.g., linearization error, parametric uncertainties, and neglected dynamics. Then we set the interconnection structure which includes the above structurally represented uncertainties. Next we design a robust fj, controller which achieves robust performance condition using the structured singular value fi. Finally we evaluate the proposed interconnection structure and verify robustness and performance of the designed f i controller by experiments.