Sliding Mode Control for an Electro-Magnetically Levitated Shaft

M.S. Kang, J.-S. Yoon, and B.-S. Park (Korea)

Keywords

Electrooptical Sight, Active Magnetic Bearing, Sliding Mode Control, Parameter Uncertainty, Base Disturbance

Abstract

This paper describes the application of an active magnetic bearing (AMB) system to levitate the elevation axis of an electro-optical sight mounted on a moving vehicle. In this type of system, it is desirable to retain the elevation axis in an air-gap between magnetic bearing stators while the vehicle is moving. A sliding mode control is applied to increase robustness to model uncertainties and to reduce disturbance responses. To ensure the authority of sliding mode control, model parameter uncertainties of AMB systems are analyzed and reachability to sliding surface has been verified. The proposed control is applied to a 2 DOF active magnetic bearing system subject to base motion. The feasibility of the proposed technique is verified with experimental results.

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