Reduced-order flux observers with stator-resistance adaptation for speed-sensorless induction motor drives

Marko Hinkkanen, Lennart Harnefors, Jorma Luomi

Research output: Contribution to journalArticleScientificpeer-review

109 Citations (Scopus)
264 Downloads (Pure)

Abstract

This paper deals with reduced-order flux observers with stator-resistance adaptation for speed-sensorless induction motor (IM) drives. A general analytical solution for the stabilizing observer gain is given. The gain has two free positive parameters (which depend on the operating point), whose selection significantly affects the damping, convergence rate, robustness, and other properties of the observer. The general stability conditions for the stator-resistance adaptation are derived. An observer design is proposed that yields a robust and well-damped system and requires a minimal amount of tuning work. The proposed observer design is experimentally tested using a 45-kW IM drive; stable operation at very low speeds under different loading conditions is demonstrated.
Original languageEnglish
Pages (from-to)1173-1183
Number of pages11
JournalIEEE Transactions on Power Electronics
Volume25
Issue number5
DOIs
Publication statusPublished - 6 May 2010
MoE publication typeA1 Journal article-refereed

Keywords

  • flux observer
  • induction motor drives
  • speed sensorless
  • stability conditions
  • stator-resistance estimation

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