A New Adaptive SMO for Speed Estimation of Sensorless Induction Motor Drives at Zero and Very Low Frequencies

A speed control of sensorless induction motor (IM) drives at zero and very low frequencies is designed in this paper. A new adaptive sliding mode observer (SMO) to estimate the stator current, rotor flux, and rotor speed is proposed. To improve the robustness and accuracy of an adaptive SMO during v...

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Bibliographic Details
Published in:IEEE transactions on industrial electronics (1982) 2018-09, Vol.65 (9), p.6901-6911
Main Authors: Zaky, Mohamed S., Metwaly, Mohamed K., Azazi, Haitham Z., Deraz, Said A.
Format: Article
Language:English
Subjects:
Adaptation models
Adaptive sliding mode observer (SMO) gains
Fluxes
Induction motors
induction motors (IMs)
Liapunov functions
Low frequencies
observability issues
Observers
Robot sensing systems
Robustness
Rotor speed
Rotors
sensorless control
Sliding mode control
SMO
Speed control
Stability
Stators
very low and zero frequencies
Very Low Frequencies
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Summary:A speed control of sensorless induction motor (IM) drives at zero and very low frequencies is designed in this paper. A new adaptive sliding mode observer (SMO) to estimate the stator current, rotor flux, and rotor speed is proposed. To improve the robustness and accuracy of an adaptive SMO during very low frequency operation, the sliding mode flux observer uses independent gains of the correction terms. The gains of current and rotor flux SMOs are designed using Lyapunov stability theory to guarantee the stability and fast convergence of the estimated variables. A Lyapunov function candidate utilizing the error of rotor fluxes and speed estimation error is synthesized for speed estimation. Detailed simulations and experiments are given showing the operation of the sensorless speed control at very low frequency. The results prove the accuracy and robustness of the proposed adaptive SMO. Also, comparison results with the state-of-the-art methods prove that the proposed method shows excellent transient and steady-state speed estimation, particularly at very low and zero frequency operations.
ISSN:0278-0046
1557-9948
DOI:10.1109/TIE.2018.2793206