Sensorless control of induction motor drives at very low and zero speeds using neural network flux observers

Shady M. Gadoue*, Damian Giaouris, John W. Finch

*Corresponding author for this work

Research output: Contribution to journalArticle

Abstract

A new method is described which considerably improves the performance of rotor flux model reference adaptive system (MRAS)-based sensorless drives in the critical low and zero speed regions of operation. It is applied to a vector-controlled induction motor drive and is experimentally verified. The new technique uses an artificial neural network (NN) as a rotor flux observer to replace the conventional voltage model. This makes the reference model free of pure integration and less sensitive to stator resistance variations. This is a radically different way of applying NNs to MRAS schemes. The data for training the NN are obtained from experimental measurements based on the current model avoiding voltage and flux sensors. This has the advantage of considering all drive nonlinearities. Both open- and closed-loop sensorless operations for the new scheme are investigated and compared with the conventional MRAS speed observer. The experimental results show great improvement in the speed estimation performance for open- and closed-loop operations, including zero speed.

Original languageEnglish
Pages (from-to)3029-3039
Number of pages11
JournalIEEE Transactions on Industrial Electronics
Volume56
Issue number8
DOIs
Publication statusPublished - 17 Aug 2009

Keywords

  • Flux estimation
  • Induction motor
  • Model reference adaptive system (MRAS)
  • Neural networks (NNs)
  • Sensorless control

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