Two Layered Fuzzy Logic Control for Dc Motor Speed Control and Performance Improvements

This paper investigates an application of the fuzzy logic technique for designing the speed control of a DC motor system to damp the oscillations due to different load disturbances. The Direct Current (DC) motor with conventional Proportional Integral (PI) speed controller is evaluation. This can be easily implemented and are found to be highly effective if the load changes are small. The proposed fuzzy logic controller, called a two layered fuzzy controller, consists of two layers. The first one is called the pre-compensator, which is used to generate and update the reference value of speed and current control, while the second one, called feedback fuzzy logic controller, makes the speed and current tracking the reference speed. Moreover, a comparison between the DC motor speed control by using the conventional PI controller and the proposed two-layered fuzzy logic controller is reported and obtained. Single loop (speed control) and double loop (speed and current) control of a DC motor drive using PI and proposed two-layered fuzzy logic control is evaluated. The digital results prove that the power of the present two layered fuzzy logic controller over the conventional PI controller in terms of fast response with less overshoot and small settling time. Kew-Words: DC motor, PI control, Two-Layered Fuzzy logic control, Lead Frequency Control( LFC), Sliding Mode Control (SMC) Minia Journal of Engineering and Technology, (MJET) Vol. 33, No 2, July 2014