A fuzzy controller is designed for closed loop control of Chopper controlled generator load coupled separately excited DC motor and presented in this paper. This system has been designed to have two loops with an inner fuzzy current controller and an outer fuzzy speed controller. A linear model of closed loop system is developed by using small perturbation technique including the effect of generator load, the armature reaction and the chopper commutation time. A trapezoidal method is used to estimate the chopper commutation time. The transient responses of the system are obtained by using the matlab simulation. The performance in respect of voltage variation or load variation and speed change has been obtained. The performance of the proposed controller is compared with the classical control results and found that the fuzzy-based Chopper controlled generator load coupled separately excited DC motor has better results. Keywords: conjunction, disjunction, fuzzification, defuzzification, electric motor simulation.
