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In this paper, the authors propose a hybrid sensorless control method of IM. This method consists of using the differential flatness theory and reduced MRAS observer. The control design proceeds by showing that each input of the motor model stands for a differentially flat system, where the flat output is chosen to be the associated state variable. Next, for each regulation loop a virtual control input is computed that can invert the loop’s dynamics and can eliminate the system’s tracking error. The reduced MRAS observer is used to estimate the rotor speed and flux. Simulation and experimental results are presented to illustrate the effectiveness of the proposed approach for sensorless control of the induction motor.

Sensorless Control of Induction Motor Based on Differential Flatness Theory and Reduced MRAS Observer