Observer-based second order sliding mode control laws for stepper motors

This paper deals with the design of an observer-based second order sliding mode control law for the stepper motor. The control objective is to perform accurate tracking of the motor position. The motor velocity is obtained via a second order sliding mode observer. The second order sliding mode controller is shown to be robust with respect to time-varying load torque perturbation and parametric uncertainties. Experimental results illustrate the efficiency of the proposed approach.