Análise do comportamento dinâmico do motor de indução no acionamento com chave de partida estática e inversor de frequência.

Abstract

In this work the dynamic behavior of the start-up of a three-phase induction supplied through a static start-up switch or through a three-phase voltage source inverter. The dynamic behavior is studied under various operating conditions. The study focuses industrial applications and the most usual types of loads are considered. A simulation program to study the different operating condition was written. This program employs the dynamic model of the induction motor and a detailed representation of the static start-up switch as well as of the voltage source inverter. The problem of determining the initial conditions for the start-up static switch is formulated and a method for solving it is discussed. A comparative study of the drive system performance obtained when the motor is supplied through the static start-up switch and through the voltage source inverter is conducted. In this comparison, the acclerating time, the current, the start-up torque and the thermal limitations are used to characterize the start-up capability. The simulation results are compared with the experimental results obtained from an experimental set-up configured with off the shelf equipments.