Hwa Chang Sung, Jin Bae Park, and Young Hoon Joo
Takagi-Sugeno (T-S) fuzzy system, robust control, active magnetic bearing (AMB) system, linear matrix inequality (LMI)
This paper proposes the robust switching-type fuzzy control for an active magnetic bearing (AMB) system. In order to design a feasible robust controller, the nonlinear systems are converted to the Takagi-Sugeno (T-S) fuzzy systems, which are used as a basic framework to synthesize the fuzzy controller. The tracking problem and the constraints on the magnitude of the control input, both of which are often required in design of controllers for nonlinear plants, are considered in the design of the robust switching-type fuzzy controller. All conditions for the synthesis of the controller are consistently formulated in linear matrix inequalities (LMIs). Simulation results of AMB system show that the performance of the designed fuzzy controller is quite splendid in both tracking and stabilizing the concerned system.
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