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This paper addresses the sensorless control scheme of induction machines using transient voltage excitation at zero and low frequencies. The method is based on saliency detection through the use of pulse excitation and the evaluation of the response of the machine line currents changes. Different signal processing structures are necessary for the rotor position estimation. The estimation algorithm...
According to earlier work and papers by other authors, the main flux path of an induction machine is not only saturated due to the magnetizing current, or in other words ldquothe magnetizing inductance can be modeled as a function of torquerdquo. In addition, at a given magnetizing current, the flux linkage decreases with rising supply frequency. These effects should be considered when using control...
This contribution deals with design of sliding mode based stator flux observer for direct torque and flux controlled induction machine drives. Proposed flux observer is completed by simple estimation of rotor speed in order to achieve a sensorless drive control. Proper function of presented sensorless control is verified by both simulations and experiments made on designed laboratory prototype of...
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