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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.