Sliding Mode Observer for Induction Motor Control

The control of induction motor drives constitutes a vast subject, and the technology has further advanced in recent years. In control algorithms, continuous rotor position is mandatory. But the presence of encoder increases cost, reduces reliability. Therefore, elimination of this sensor is desirable. A sensorless of the vector controlled induction motor means the vector control without using any speed sensor. In the paper, a sliding mode observer and its applications in the sensorless control of the induction motor drive are proposed. The mathematical equations of induction motor, sliding mode observer and vector control are described in the paper. The stability of observer is proved base on Lyapunov theory. Simulation results are also presented in the paper.

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