ResPubID25894, feedback, fuzzy control, magnetic bearings, nonlinear control systems, notch filters, stability, variable structure systems, processors, dynamic output feedback sliding mode controller, fuzzy logic controller, magnetic bearing system stability, magnetic bearing system stabilisation,  medium size disturbances, nonlinear control methods, nonlinear controllers, output voltage, resonant modes, small size disturbances, unstable nonminimum phase magnetic bearing systems, magnetic levitation, magnetic sensors, mathematical models, niobium