Controle da malha de torque com acionamento de velocidade aplicado a uma bancada experimental para ensaio de motores

Abstract

This work presents an experimental motor test bench and exhibits the implementation of a digital control strategy applied to the torque loop of a three-phase induction motor, which has speed as a control variable. Through a data acquisition board and a computer with mathematical computational package, a constant torque controller is implemented, asynchronously, in cascade with the loop speed of the bench inverter, which is capable of regenerate energy and returns it to the power grid. It is necessary to identify the bench speed system model through an APRBS signal. This signal is designed according to the operating point of the test bench and in possession of the estimated model, a PI controller is designed and tuned following an RST structure. The results of the practical implementation are very similar to those observed in simulation, which shows the effectiveness of the applied control on the constant load torque profiles emulation. The controller presented here is sufficiently robust before disturbances which, in this work, were achieved by imposing a supply voltage reduction on the motor under test.