Output Voltage Correction Using a Disturbance Observer for Induction Motor Drive with Speed Sensor-less Vector Control

Abstract

This paper proposes a method for correcting voltage errors using a disturbance observer for an induction motor controlled by speed sensor-less vector controller. The disturbance observer uses a fast-response observer, which responses ten times as fast as current controller in sensor-less vector controller. The voltage error is thus efficiently corrected using the proposed method. The proposed method is validated on the basis of the experimental results. This method can be used to decrease current distortion to less than 1/3 that observed without the correction method.