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This study presents the application of the techniques of the observer in sensorless control of inductor motor. Sensorless control requires the estimate in real time of the non measurable quantities. The observer of Luenberger and Kalman makes it possible to solve this problem thanks to the use of a model of state of the induction motor. In this research we use the model having for variables of state the current and stator flux. The technique of sensorless control using the observer of a complete nature is presented in simulation. Linear and non linear variables of Luenberger observer are also discussed in theoretical overview.
In this study, we approach the diagnosis of the stator and rotor defects in the asynchronous squirrel-cage machines. After having evoked the principal defects being able to occur, we propose a model of the machine based on the method of circuits magnetically coupled. This model makes it possible to study the influence of the defect of short circuit and break of bar, on the general behavior of the asynchronous motor. In complement of the undertaken study, we will highlight the importance of the analysis of the signals for the diagnosis of the stator and rotor defects.
