Neuro-detector based on coherence analysis for stator insulation in electric motors

Emine Ayaz*, Murat Ucar, Serhat Seker, Belle R. Upadhyaya

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

6 Citations (Scopus)


This research describes the monitoring of the fundamental spectral features of stator insulation damage through accelerated aging studies for induction motors with a power rating of 5 HP. In order to accomplish this goal, even-harmonic values of the line frequency defined between the 4th and the 16th harmonics, which are computed by the coherence approach between the stator currents and vibration signals, are determined as indicators of stator insulation damage. After this determination, a neuro-detector based on the auto-associative neural structure is trained in the frequency domain. This uses coherence variations and even-harmonic values as indicators of the insulation damage of an induction motor by observing the changes in the errors (residuals) generated by the neural net.

Original languageEnglish
Pages (from-to)533-546
Number of pages14
JournalElectric Power Components and Systems
Issue number5
Publication statusPublished - May 2009


  • Aging process
  • Coherence
  • Even harmonics
  • Induction motors
  • Neural network
  • Stator insulation fault


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