Fractional Order Sliding Mode Control based on Extended State Observer for Conical Active Magnetic Bearing

Due to the nonlinearities and inherent coupling properties of conical active magnetic bearing system(CAMB), it is crucial to achieve a suitable mathematical model and devise a control scheme with high accuracy. In this study, extended state observer (ESO) is used to reject the lumped disturbances of CAMB system which come from external disturbances, uncertain electromagnetic forces and parametric uncertainties. Based on extended state observer, a fractional order sliding mode control (FOSMC) is designed to achieve fast response and minimize tracking errors as well as better control quantity without chattering. The MATLAB/Simulink simulation results demonstrate the excellent disturbance rejection capability of the suggested FOSMC-ESO controller, highlighting its strong performance.