An improved flux observer based on PLL frequency estimator for sensorless vector control of induction motors
Comanescu, M.; Xu, L.
Industrial Electronics, IEEE Transactions on
Volume 53, Issue 1, Feb. 2006 Page(s): 50 - 56
Digital Object Identifier   10.1109/TIE.2005.862317
Summary: 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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