Design and Simulation of Linear and Non-linear Controllers for dc Motor Drives Application

摘要

This paper is dedicated to control the speed of separately excited dc motor using linear and non-linear controllers. For the response analysis, the linear controller is considered namely Proportional integral derivative controller (PID) and non-linear controller called Sliding mode controller (SMC). The SMC controller is based on variable structure systems (VSS) which aim at reducing the settling time, peak overshoot and steady state error of a separately excited dc motor. In the first stage, PID controller is used to control the speed, torque, angle and armature current of separately excited dc motor. A model is developed and simulated using MATLAB/SIMULINK. Later on the same is done with sliding mode controller. The speed control of dc motor using both PID and sliding mode controller is studied and results are compared. The simulation results show that sliding mode controller is superior to PID for speed control of dc motor. Therefore, the SMC is robust in presence of disturbances; the desired speed is perfectly tracked.