Fuzzy logic in the phase-locked loop DC motor speed control system

This paper presents a novel design using fuzzy logic control and phase-locked loops to obtain a DC motor speed control system with excellent regulation and high robustness. The fuzzy logic controller is incorporated in order to achieve quick control of motor speed smoothly. The fuzzy logic controller enhances the robustness of the motor control system, which can handle abrupt load variation and exhibits good disturbance behavior. The PLL becomes effective at steady-state conditions when the speed error is small. A control scheme using fuzzy control of DC motor speed with extremely accuracy provided by PLL is implemented. Simulation demonstrates the effectiveness of the proposed scheme. Test results show that a system which consists of both fuzzy control and PLL can yield a high performance DC motor speed control system