Design and implementation of a new sliding-mode observer for speed-sensorless control of induction machine
Derdiyok, A.; Guven, M.K.; Rehman, H.; Inanc, N.; Longya Xu
Industrial Electronics, IEEE Transactions on
Volume 49, Issue 5, Oct 2002 Page(s): 1177 - 1182
Digital Object Identifier   10.1109/TIE.2002.803247
Summary: In this letter, a new sliding-mode-sensorless control algorithm is proposed for the field-oriented induction machine drive. In the proposed algorithm, the terms containing flux, speed, and rotor time constant, which are common in both current and flux equations, in the current model of the induction machine are estimated by a sliding function. The flux and speed estimation accuracy is guaranteed when the error between the actual current and observed current converges to zero. Hence, the fourth-order system is reduced to two second-order systems, and the speed estimation becomes very simple and robust to the parameter uncertainties. The new approach is verified by simulation and experimental results.

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