REAL TIME IMPLEMENTATION OF A FUZZY LOGIC CONTROLLER ON FPGA USING VHDL FOR DC MOTOR SPEED CONTROL

摘要

Fuzzy logic control (FLC) has met with growing interest in many motor control applications due to its nonlinearity, handling features and independence of plant modelling. The hardware implementation of FLC on FPGA is very important because of the increasing number of fuzzy applications requiring highly parallel and high speed fuzzy processing. Implementation of a FLC and conventional PI controller on an FPGA using VHDL for DC motor speed control is presented in this paper. The proposed scheme is to improve tracking performance and rejection of load disturbances of D.C. motor as compared to the conventional PI control strategy .This paper describes the hardware implementation of two inputs (error and change in error), one output FLC and conventional PI controller using VHDL. Real time implementation of FLC and conventional PI controller is made on Spartan-3A DSP FPGA (XC3SD1800A). It is observed that FLC give better responses than the conventional PI controller for the speed control of dc motor.