Model-based speed identification for induction Machines in the whole operating range
Depenbrock, M.
Evers, C.
Inst. for Generation & Applic. of Electr. Energy, Ruhr-Univ. Bochum, Germany;
This paper appears in: Industrial Electronics, IEEE Transactions on
Publication Date: Feb. 2006
Volume: 53,
Issue: 1
On page(s): 31- 40
ISSN: 0278-0046
INSPEC Accession Number: 8765362
Digital Object Identifier: 10.1109/TIE.2005.862323
Current Version Published: 2006-02-06
Abstract
A speed observer for induction machines without rotational transducers is presented. In contrast to known adaptive observer strategies, the proposed scheme uses-beside the conventional current difference-its integral and a new pair of stretch-turn operators not only to avoid the known instability region at braking but to obtain furthermore a constant gain. To ensure operation with very low stator frequencies, an elimination of parasitic dc components is presented additionally. Characteristics are explained and verified by measurements.
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