Desenvolvimento de bancada didática para acionamento de motores de indução trifásicos com velocidade variável

Abstract

This monography presents the development of a workbench to drive three-phase induction motors. The work starts from a contextualisation about the activation of variablespeed three-phase induction motors, following a review of induction motors, and then basic concepts of AC/DC/AC converters and pulse width modulation techniques (PWM). After defining the converter topology and modulation strategy to be used, was realized the design of the circuits necessary for the implementation of the workbench. Computational simulations are then performed using software LTSpicer to verify the behavior of the circuits and to validate their design. After that, the implementation of the rectifier, filter and inverter stages, as well as the instrumentation circuits for current and velocity readings is performed. At that stage it was also developed for the implementation of the Space Vector modulation technique in the TMS320F28069M microcontroller by Texas Instrumentsr . The values and waveforms of current and voltage at the input and output of the converter showed the expected behavior, however, for the instrumentation stage it was necessary to add a digital filter, implemented in the microcontroller used, to reduce the electromagnetic noise present in the signals.