Sliding Mode Control of DC Drives

In this paper a sliding mode control (SMC) of DC machine is presented. The main arguments in favor of sliding mode control are order reduction, decoupling design procedure, fast response, disturbances rejection, and insensitivity to parameter variations. In SMC with unmodelled dynamics chattering phenomenon is eliminated by constructing the sliding manifold based on reduced order model of the system with observer state. In case of high order models of electric machines, non-linear ties in motion equations; uncertainties in model parameters and disturbances are the main obstacles for development and rigorous mathematical analysis of such systems. The simulation result depicts that the integral square error (ISE) performance index for reduced order model of the system with observer state is better than reduced order with measured state.