Vector-Controlled Induction Motor Drive with Minimal Number of Sensors

Abstract

This paper proposes an improved and robust
induction motor drive control method which uses minimal
number of sensors, providing only dc-link current measurement
as a feedback signal. The proposed dc-link current sampling
scheme and modified asymmetrical PWM pattern cancel
characteristic waveform errors which exist in all three
reconstructed line currents. In that way, proposed method is
suitable for high-quality and high-performance drives.
Comparison between conventional and proposed current
reconstruction method is performed using hardware-in-the-loop
(HIL) test platform and digital signal processor (DSP).