Flux Observer Enhanced With Low-Frequency Signal Injection Allowing Sensorless Zero-Frequency Operation of Induction Motors

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Journal Title
Journal ISSN
Volume Title
School of Electrical Engineering | A1 Alkuperäisartikkeli tieteellisessä aikakauslehdessä
Date
2005
Major/Subject
Mcode
Degree programme
Language
en
Pages
52-59
Series
IEEE Transactions on Industry Applications, Volume 41, Issue 1
Abstract
In sensorless induction motor drives, flux estimators based only on the standard motor model work well at sufficiently high stator frequencies, but they fail at frequencies 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.
Description
Keywords
flux estimation, induction motor drives, signal injection, speed sensorless
Other note
Citation
Hinkkanen, M. & Leppanen, V.-M. & Luomi, J. 2005. Flux Observer Enhanced With Low-Frequency Signal Injection Allowing Sensorless Zero-Frequency Operation of Induction Motors. IEEE Transactions on Industry Applications. Volume 41, Issue 1. 52-59. ISSN 0093-9994 (printed). DOI: 10.1109/tia.2004.840958.