Adaptive fuzzy PI controller for speed of separately excited DC motor

Presents the design of an adaptive fuzzy PI controller to control the speed of a separately excited DC motor by self-tuning. The speed of the motor can be changed by controlling the armature and field voltages. In the paper, the adaptive fuzzy PI controller is designed to control the armature voltage while the field voltage is fixed as a constant. The fuzzy system tunes the gains of the PI controller according to error and change of error of the speed control system to meet the step response specifications of the motor speed. The experimental results show that the step responses of the speed of the DC motor controlled by the adaptive fuzzy PI controller have step responses with small overshoot when compared to the usual PI cascade controller. That is, the proposed controller gives the controlled system small overshoot and zero steady-state error when the reference speed is 2000 rpm at no load, half load and full load. The effect of the applied step full load and released load at steady state is also rapidly rejected.