Fractional Fuzzy PID Controller for Speed Control of DC Motor

In this paper, a novel technique for controlling the speed of DC motor is developed. It uses the conventional fuzzy control for controlling the K_p, K_{i &} K_d of an integer-order PID controller along with fractional-order integral and derivative parts. The parameters of the PID controller are first tuned using Ziegler Nichols. Then, using GA, optimized solutions for K_p, K_{i &} K_d and λ & μ (which are the fractional components of integral & derivative parts) are obtained. A Fuzzy Logic Controller (FLC) whose inputs are error & change in error is designed to obtained the crisp values of K_p, K_{i &} K_d. These values along with the results of GA, are combined to yield better performance. Simulation results are presented in MATLAB. These results are compared with the conventional PID & fractional-order PID simulation results and it is observed that the proposed technique gives better performance.