Speed Control of DC Motor Using Linear and Non-Linear Controllers

The main aim of this paper is to keep guidance over the speed of a separately excited DC motor utilizing both linear and nonlinear controllers. PID controller is considered as a linear controller and SMC (Sliding Mode Controller) is considered as a nonlinear controller. Both the controllers are used for analysis. The first goal of this paper is to design a SMC based on variable structure systems which is a robust non linear control insensitive to external disturbances and parametric changes with aim to decreasing the settling time, undershoot, maximum overshoot and rise time of a separately excited DC motor as compared to PID controller. A dynamic model of separately excited DC motor is created and both conventional PID controller and SMC are implemented separately for speed control using MATLAB/SIMULINK. The simulation results obtained from both the controller are studied and compared, which shows that SMC has excellence dynamic performance than conventional PID as speed regulator of DC motor. While in occurrence of disturbances SMC is robust, the ideal speed is impeccably followed.