Modelagem de quebra de barras e de curto-circuito entre espiras em motores de indução.

Abstract

The wide use of three-phase squirrel-cage rotor induction motors has motivated the growing study of systems that aim to reduce the possibility of abrupt stop of these motors, avoiding expenses with their replacement, as well as the reduction of the stopping time of the motors. processes attached to it. Failures in the parts that are part of it are mainly responsible for such stops. Rotor bars breaking and shorting between turns of the stator windings are examples of possible faults occurring in induction motors, representing almost half of the universe of faults occurring in these motors. Thermal, electrical, mechanical stresses and those caused by the environment to which the engine is subjected are the main causes of the appearance of these types of faults. The need to detect these failures at an early stage justifies the development of monitoring methods. Thus, the analytical modeling of the induction motors under rotor bar break and short circuit between stator turns becomes a base tool in the development of such systems. Therefore, we study in the models of machine representation under bar breaking and two of short circuit between stator turns. The representativeness and complexity of these models are evaluated.