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Comparison of a reduced-order observer and a full-order observer for sensorless synchronous motor drives
KTH, School of Electrical Engineering (EES), Electrical Energy Conversion.
2012 (English)In: IEEE transactions on industry applications, ISSN 0093-9994, E-ISSN 1939-9367, Vol. 48, no 6, 1959-1967 p.Article in journal (Refereed) Published
Abstract [en]

Two back-electromotive-force-based position observers are compared for motion-sensorless synchronous motor drives: the reduced-order observer and the adaptive full-order observer. A stabilizing gain is proposed for the adaptive full-order observer, which guarantees the local stability of the closed-loop system, if the motor parameters are known. Equations for the steady-state position error and for the linearized estimation-error dynamics under erroneous parameters are derived, and the robustness of the two observers against parameter errors is analyzed and compared. The observers are experimentally evaluated using a 6.7-kW synchronous reluctance motor drive in low-speed operation and under parameter errors. The gain selection of the reduced-order observer is easier, but the adaptive full-order observer can be made more robust against parameter variations and noise.

Place, publisher, year, edition, pages
2012. Vol. 48, no 6, 1959-1967 p.
Keyword [en]
Observer, parameter uncertainties, permanent-magnet (PM) synchronous motor (PMSM), sensorless, stability conditions, synchronous reluctance motor (SyRM)
National Category
Electrical Engineering, Electronic Engineering, Information Engineering
URN: urn:nbn:se:kth:diva-116824DOI: 10.1109/TIA.2012.2226200ISI: 000313364000020ScopusID: 2-s2.0-84872101513OAI: diva2:604421

QC 20130129

Available from: 2013-01-29 Created: 2013-01-28 Last updated: 2013-02-11Bibliographically approved

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Harnefors, Lennart
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