Commande vectorielle d'un moteur asynchrone à cage avec adaptation par logique floue de la résistance rotorique et minimisation des pertes totales

Abstract

Since few years ago, the fuzzy logic takes a particularly intersting turn and achieves a considerable role in the complex system control. In this survey, we inted to apply it on the vector control of induction motor decoupled by the field oriented tecnique specially extensively in the variable - speed drives with objective of this technique is surmount some inherent constraints. The variation of rotor resistance and the poor efficiency are the main constraints of the induction motor decoupled by the rotor Field oriented technique. In effect, the first constraint affects features of speed regulation and inceases stator current beyond a reasonable level corresponding to the load. While the second appears when the motor drives a small load. Therefore, maintaining a constant flux results in increasing current and power loss. In order to solve the two problems, we proceed in a gradual manner, first conceive a mechanism of rotor resistance adaptation based on the fuzzy logic, then, we propose a second mechanism to optimize hte consumption of the energy to weak load in steady state. The coexistence of the two mechanisms and their simultaneous working is taken in consideration by the fuzzy ruls