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Journal of the Korean Institute of Illuminating and Electrical Installation Engineers

ISO Journal TitleJ Korean Inst. IIIum. Electr. Install. Eng.
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Title A Study on the Influence of Nominal Model in Disturbance Observer Controller for Electro-Magnetic Suspension Systems
Authors Nam-Hoon Jo
DOI http://dx.doi.org/10.5207/JIEIE.2016.30.11.064
Page pp.64-70
ISSN 1225-1135
Keywords Electro-Magnetic suspension system ; Disturbance Observer ; Nominal Model ; Noise Suppression ; Disturbance Rejection
Abstract The disturbance observer (DOB) controller has been very popular among control engineers since it has powerful capability in uncertainty compensation and disturbance rejection. In this paper, we study the influence of nominal model on disturbance observer controller for Electro-Magnetic suspension (EMS) systems. While the conventional DOB controller uses the nominal model having the same relative degree as real plant, this paper proposes a new DOB controller consisting of the nominal model having smaller relative degree than real one. Control performance was compared between two DOB controllers with respect to disturbance attenuation and noise suppression. It was found that the proposed DOB controller outperforms the conventional DOB controller, especially for the noise suppression capability.