A fuzzy logic controller applied to a d.c. motor

This paper describes a Fuzzy Control System applied to the shaft position of a direct current motor of 1/15 H.P. (with a tension of 0 to 24 V at 0.75 A), running from 100 to 6500 R.P.M. The work includes three important aspects: Design, Simulation, and Implementation. In this design the Variable Structure System was used to stabilize using 11 If-Then rules, and for tuning using the Genetics Algorithms Method, which use 10 fuzzy membership functions. The simulation used a structured programming language based on Turbo C++ to present the variable of interest against the time. The implementation used a personal computer, a converted board A/D and D/A (-5 to volt), a current driver (3 A), a digital encoder of 240 slots, and a real time structured program based also on Turbo C++.