A novel observer-based flux estimation for speed sensorless DFO control of induction machine

Z. S. Wang, Siu Lau Ho, Ka Wai Eric Cheng

Research output: Journal article publicationJournal articleAcademic researchpeer-review

7 Citations (Scopus)


This article proposes a novel closed-loop rotor flux observer to estimate the rotor flux and velocity of induction motors. With the proposed algorithm, the accuracy of the estimated flux is guaranteed when the estimated stator current converges to its actual one. With the help of the estimated rotor flux magnitude and angle information, the direct rotor field orientation vector control can be implemented, and the rotor speed can be derived. Compared with the traditional Luenberger observer, the salient advantage of the proposed observer-based flux estimation is that the flux estimation is independent of either the estimated speed error or rotor time constant deviation. The validity of the proposed method is verified by intensive digital simulation results.
Original languageEnglish
Pages (from-to)333-348
Number of pages16
JournalElectric Power Components and Systems
Issue number3
Publication statusPublished - 1 Mar 2005


  • Direct field oriented vector control
  • Induction motor
  • Speed-sensorless

ASJC Scopus subject areas

  • Energy Engineering and Power Technology
  • Mechanical Engineering
  • Electrical and Electronic Engineering

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