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This paper introduces a new scheme to track the rotor slotting saliency in induction motors by using the measurement of current derivatives in response to test vectors imposed during null switching vectors of a standard PWM scheme by using 3 H-bridges connected in series with a 2-Level inverter. The scheme aims to reduce the current distortion usually introduced by applying the sensorless control...
The output voltage of an inverter is often assumed proportional to the drive modulation signal. However, in practice the inverter presents nonlinear characteristics that may significantly affect the output voltage, and this may be critical in the context of sensorless drives and parameter identification. Nowadays, several solutions exist to compensate for the nonlinear behaviour of the inverter. Nevertheless,...
Indirect Stator-Quantities Control (ISC) combines the principle of stator-flux-orientation proven successful in Direct Self Control (DSC) with Pulse-Width Modulation (PWM). High torque dynamics and robust behaviour against input voltage disturbance are achieved in the whole operation range including field-weakening. After careful correction of inverter-voltage errors and dc portions in the stator...
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