SLIDING MODE CONTROL BASED ON EXTENDED STATE OBSERVER FOR THRUST MAGNETIC BEARINGS CONSIDERING THE EFFECT OF EDDY CURRENTS

Abstract

This paper investigates an extended state observer based sliding mode observer for active thrust magnetic bearings considering the eddy current influence.
The proposed control system is to incorporate the influence of eddy currents into the active bearing system and use control system to eliminate the influence of
eddy currents and external load disturbances acting on the rotor to achieve the desired position. First, a mathematical model of the thrust magnetic bearings
considering the influence of one-degree-of-freedom eddy currents is built. However, the under a lumped disturbance such as: the influence of eddy currents in
the actuator, uncertain parameters, and external load disturbances acting on the rotor. A sliding mode controller based an extended state observer is studied to
play the role in estimating position, velocity, total nonlinear disturbance. To demonstrate the performance of the active magnetic bearing considering the
influence of the lumped disturbance and eddy currents, Matlab/Simulink environment is used that the active magnetic bearing works stably following the
desired set value with static deviation compared with the conventional sliding mode control and reduce the sensor measuring the rotor's rotation speed.