Resumo:
Until a few decades, control systems for induction engines (totally more
robust than the other kind of engines) were more costly when compared with the
control of motors of continuous current. With the advent of theory of vector control
and the technological development of semiconductors this context has altered
itself, nearly matching the characteristics of the induction and continous current
motors. This work will present the implementation of a system for the vector control
for the imposition of currents control for the trifase induction. The system was
developed through a microcomputer, a system of data acquisition, a rectifying
bridge with diodes and an inverter bridge with IGBTs with drivers for pivoting. A
theoretical introduction will be presented about vector control, where a control loop
will be shown that has been proposed for Leonard (1986) in which the control was
based. Following this the presentation of the software and hardware developed
through the hystherisis of current, will impose the current to the motor. Finally the
results obtained will be seen, showing the speed control of the motor with load
variations, including with the inversion of rotation of the same.
