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An improved flux observer based on PLL frequency estimator for sensorless vector control of induction motors

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2 Author(s)
Comanescu, Mihai ; Dept. of Electr. & Comput. Eng., Ohio State Univ., Columbus, OH, USA ; Longya Xu

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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Industrial Electronics, IEEE Transactions on  (Volume:53 ,  Issue: 1 )