A Practical Extended Harmonic Disturbance Observer Design for Robust Current Control of Speed Sensorless DC Motor Drives

In Hyuk KIM  Young Ik SON  

Publication
IEICE TRANSACTIONS on Fundamentals of Electronics, Communications and Computer Sciences   Vol.E99-A   No.6   pp.1243-1246
Publication Date: 2016/06/01
Online ISSN: 1745-1337
DOI: 10.1587/transfun.E99.A.1243
Type of Manuscript: LETTER
Category: Systems and Control
Keyword: 
DC motor,  robust current control,  biased sinusoidal disturbance,  disturbance observer,  

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Summary: 
An extended harmonic disturbance observer is designed for speed (or position) sensorless current control of DC motor subject to a biased sinusoidal disturbance and parameter uncertainties. The proposed method does not require the information on the mechanical part of the motor equation. Theoretical analysis via the singular perturbation theory is performed to verify that the feedforward compensation using the estimation can improve the robust transient performance of the closed-loop system. A stability condition is derived against parameter uncertainties. Comparative experimental results validate the robustness of the proposed method against the uncertainties.