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Sensorless speed control of a three-phase induction motor: An experiment approach

This paper presents a method of estimating the speed of an induction motor Luenberger. This method is based on speed sensorless estimation of vector controlled induction motor drive and adaptive control theory. A flux observer of an induction motor with a parameter adaptive scheme will be proposed. The parameters identified adaptively are stator and rotor resistance. A stability of the proposed adaptive flux observer will be proved by the Lyapunov's theorem. An adaptive scheme can be applied also to estimate motor speed without speed sensors. The theoretical basis of indirect field oriented vector control is explained in detail and it is implemented in Matlab, Simulink. Furthermore, experimental results of an indirect field-oriented induction motor control without speed sensor using DSP 1104 card are presented. Simulation and experimental results are presented to verify the principles and demonstrate the practicality of the approach. Those results are obtained under the condition that the motor parameters used in the observer are correct.