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Hybrid control of induction machine without speed sensors

Abstract:

In this paper, a Direct Torque Control (DTC) scheme for the induction machine is presented. The rotor speed estimation is performed using the field oriented model. Time frequency spectral methods are used for accurate speed estimation, using the stator current information. Combining these estimation techniques, a precise Tr adaptation in real time is achieved. The proposed method reduces parameter dependence of the induction machine model in the controller, and removes the need for a speed sensor in the mechanical shaft. The dynamic control performance achieved with this technique is comparable to the one obtained using optical encoders.