Speed control of DC motor using PI and SMC

In this paper, sliding mode control (SMC) technique is used to control the speed of DC motor. The performance of the SMC is judged via MATLAB simulations using linear model of the DC motor and known disturbance. SMC is then compared with PI controller. The simulation result shows that the sliding mode controller (SMCr) is superior controller than PI for the speed control of DC motor. Since the SMC is robust in presence of disturbances, the desired speed is perfectly tracked. The problem of chattering, resulting from discontinuous controller, is handled by pseudo sliding with smooth control action.