Sensorless field orientation control of induction machines based ona mutual MRAS scheme
Zhen, L.; Xu, L.
Industrial Electronics, IEEE Transactions on
Volume 45, Issue 5, Oct 1998 Page(s):824 - 831
Digital Object Identifier   10.1109/41.720340
Summary:A mutual model reference adaptive system (MRAS) is proposed to implement a position sensorless field-orientation control (FOC) of an induction machine. The reference model and adjustable model used in the mutual MRAS scheme are interchangeable. Therefore, it can be used to identify both rotor speed and the stator resistance of an induction machine. For the rotor speed estimation, one model is used as a reference model and another is the adjustable model. Pure integration and stator leakage inductance are removed from the reference model, resulting in robust performance in low and high speed ranges. For the stator resistance identification, the two models switch their roles. To further improve estimation accuracy of the rotor speed and stator resistance, a simple on-line rotor time constant identification is included. Computer simulations and experimental results are given to show its effectiveness

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