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The most industrial applications use the variation of the torque, speed and/or position in process, for which extremely severe specifications are needed. In the field of the drive of the electric machines, the elimination of the mechanical speed sensor can present an economic interest and improve safety of operation. One thus tries to make fulfill the speed measurement by implementing in a Digital...
In this paper, a new speed identification method is presented based on a stator magnetic field oriented and neuron theory in direct torque control (DTC) system. Compared with the deficiencies of the previous traditional speed identification method, in the suggested method the speed could be fleetly estimated and transferred backward to adjust controller parameters in order to make the desired speed...
This paper proposes a stator flux oriented (SFO) control scheme of induction motors using variable-saturation regulators. The traditional SFO control scheme consists in the d-axis current component, torque, stator flux, and speed loops with four PI-type controllers. The proposed control scheme uses two regulators with variable-saturation in such a way that maximum dc-bus voltage utilization is reached...
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