Adaptive variable structure controller design of turbomolecular pump with active magnetic bearings

Adaptive variable structure controller was proposed to increase the robustness and decrease the influence of the disturbance for active magnetic bearings suspended turbomolecular pump in this paper. The model reference adaptive tuner was aimed to overcome the estimation error that is caused by the parameter uncertainty and the model uncertainty. The simulation results indicated that the turbomolecular pump suspended by active magnetic bearings with adaptive variable structure controller was successfully operated in wide rang, well resisted the unbalance or external disturbance during the rotational speed raising, and the amplitude of the displacement of system could quickly reach the center nearby when disturbance force was applied to the system suddenly.