Disturbance And Initial State Uncertainty Attenuation Control For Magnetic Bearings

This paper deals with an application of H1 control attenuating initial-state uncertainties to the magnetic bearing and examines the H1 control problem, which treats a mixed Disturbance and an Initial state uncertainty Attenuation (DIA) control. The mixed H1 DIA problem supplies H1 controls with good transients and assures H1 controls of robustness against initial-state uncertainty. On the other hand, active magnetic bearings allow contract-free suspension of rotors and they are used for various industrial purposes. We derive a mathematical model of the magnetic bearing which has complicated rotor dynamics and nonlinear magnetic property. Then we apply this proposed H1 DIA control for the magnetic bearing, and design a robust H1 controller both for exogenous disturbances and for initial state uncertainties of the plant. Experimental results show that the proposed robust control approach is effective for improving transient response and robust performance.