Flux observer enchanced with low-frequency signal injection allowing sensorless zero-frequency operation of induction motors

Marko Hinkkanen, Veli-Matti Leppänen, Jorma Luomi

    Research output: Chapter in Book/Report/Conference proceedingConference contributionScientificpeer-review

    Abstract

    In sensorless induction motor drives, flux estimators based only on the fundamental-wave motor model work well at sufficiently high stator frequencies, but they fail at speeds close to zero. To solve this problem, a new observer structure is proposed, combining a speed-adaptive full-order flux observer with a low-frequency signal injection method. An error signal obtained from the signal injection method is used as an additional feedback signal in the speed-adaptation law of the observer, resulting in a wide speed range, excellent dynamic properties, and zero-frequency operation capability. The enhanced observer is also robust against parameter errors. Experimental results are shown, including very slow speed reversals and long-term zero-frequency operation under rated load torque, as well as rated load torque steps and fast speed reversals under rated load torque.
    Original languageEnglish
    Title of host publicationIEEE Industry Applications Conference
    Subtitle of host publication38th IAS Annual Meeting
    Place of PublicationSalt Lake City, UT, USA
    Pages1150-1156
    Volume2
    DOIs
    Publication statusPublished - 12 Oct 2003
    MoE publication typeA4 Article in a conference publication

    Keywords

    • full-order flux observer
    • induction motors
    • sensorless
    • signal injection
    • zero-frequency operation

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