Análise de modelos matemáticos de motores de indução trifásicos

Abstract

Three Phase Induction Motors (MIT) are the motors type most commonly used in the industry. This is due to its robustness, simplicity, low maintenance and low cost. But the efficient control of these machines is the challenge and the subject of current research. The success of the research is linked to the types of MIT models used. The use of only conventional models for representing an MIT may provide inaccurate results. In this context, this work presents the analysis of three mathematical models of threephase induction motors, compared with each other and with a real engine. The classic modeling MIT, consider a three-phase reference system “abc” but it is observed that the inductances are a function of rotor speed. To reduce the complexity in the model representation and targeting the vector control these machines, models are transformed to a reference system denoted “qd0”, which is biphasic and rotates at an arbitrary angular velocity. It first presented the conventional model is a model without iron losses or saturation in the core, soon after a more simplified model is a model that considers the constant flow and without torque disturbance, and finally a more detailed model that Conventional, which includes losses in the core. So compare the models with a real engine, where the models Krause Oleg Wasynczuk (2002) and Levi (1995) had higher performance. As a check measure the presented models are also compared with models implemented in consolidated software such as Simulink.