A Controller Design to Suppress the Interference Force of the Propulsion Equipment Acting on the Suspension System in a Magnetically Levitated Train System

In this paper we deal with a design of integral sliding mode controller to reject the disturbance force acting on the suspension system in a magnetically levitated system which is propelled by the linear induction motor. The control scheme consists of an integral compensator which is designed to achieve zero steady-state error under step disturbances, and a sliding mode controller which is designed for enhancing robustness under plant uncertainties. A proper continuous design signal is introduced to overcome the chattering problem. The disturbance force produced by the linear induction motor is formularized by using a curve fitting method. Computer simulations show the effectiveness of the designed integral sliding mode controller to reject the disturbance force in comparison with a simple sliding mode controller that does not include the integral compensator.