Designing Fuzzy Speed Controller for DC Drives and Tuning with Genetic Algorithms

In this article the designing method of a fuzzy speed controller for DC drives is presented. The designing phase consists of choosing the number of membership functions for input/output and constructing the minimal rule base. The design phase is completed with tuning the input/output membership functions using genetic algorithm. The difference between the actual and the expected transfer function of the fuzzy controller is chosen as the performance function of the genetic algorithm. The expected transfer function is constructed by analyzing the behaviour of a conventional PID speed controller for different inertia, load and speed reference. Finally, the DC drive step response is presented using both a conventional PD controller and the designed fuzzy controller.