Análise comparativa de desempenho de reguladores digitais em acionamento de motor de corrente contínua excitação série

Abstract

Nowadays the digital system of electric drives has been largely used in the industry, taking place of the analogical systems. Due to the great development of eletronics and microprocessors it is possible the development new digital control systems, e.g., the adaptive and vetorial. Recently, as artificial inteligence technics grow, a new trend starts to appear in the project of more optimized controlers. This possibility of improvement can be reached with project and implementation of current and speed regulators using fuzzy logic. The aim of this work is to demonstrate the results of a comparative analysis between proporcional and integral digital regulators against other ones using fuzzy logic. For this, a control system for the DC-driving of a c.c motor was made in laboratory, with a fully controlled Graetz bridge, a PC, a data input board, a firing electronic circuit and speed and current sensors. In this microcomputer, two diferents softwares were used, in the C++ language, according to the analyzed logic, being it responsible for the input data acquisition, control of speed and current loops and output of a control signal which controls the firing circuit. Finally, the experimental results observed in laboratory, related with the response and behavior of the system due to specifically conditions of operation for both control logics, are presented and discussed.