Comparison of a reduced-order observer and a full-order observer for sensorless synchronous motor drives

Toni Tuovinen, Marko Hinkkanen, Lennart Harnefors, Jorma Luomi

Research output: Contribution to journalArticleScientificpeer-review

51 Citations (Scopus)
370 Downloads (Pure)

Abstract

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.
Original languageEnglish
Pages (from-to)1959-1967
Number of pages9
JournalIEEE Transactions on Industry Applications
Volume48
Issue number6
DOIs
Publication statusPublished - 31 Dec 2012
MoE publication typeA1 Journal article-refereed

Keywords

  • observer
  • parameter uncertainties
  • permanent-magnet synchronous motor
  • sensorless
  • stability conditions
  • synchronous reluctance motor

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