An improved flux observer based on PLL frequency estimator for sensorless vector control of induction motors
Comanescu, M.
Xu, L.
Dept. of Electr. & Comput. Eng., Ohio State Univ., Columbus, OH, USA;
This paper appears in: Industrial Electronics, IEEE Transactions on
Publication Date: Feb. 2006
Volume: 53,
Issue: 1
On page(s): 50- 56
ISSN: 0278-0046
INSPEC Accession Number: 8765364
Digital Object Identifier: 10.1109/TIE.2005.862317
Current Version Published: 2006-02-06
Abstract
This paper presents an improved method of flux estimation for sensorless vector control of induction motors based on a phase locked loop (PLL) programmable low-pass filter (LPF) and a vector rotator. A PLL synchronized with the voltage vector is used for stator frequency estimation. The pure integration of the stator voltage equations is difficult to implement and LPFs with a fixed cutoff provide good estimates only in the relatively high frequency range-at low frequencies, the estimates fail in both magnitude and phase. The method proposed corrects the above problem for a wide range of speeds. Simulations and experimental results on a 0.25-hp three-phase induction machine verify the validity of the approach.
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