Estimation of frequency components in stator current for the detection of broken rotor bars in induction machines

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36 Citations (Scopus)

Abstract

The limitation of data window length in induction machine broken rotor bar diagnostics is a real challenge in practice. Sideband frequencies which are used as broken rotor bar indicators are very close to the fundamental frequency and have low magnitude. Traditional spectral analysis approach such as Discrete Fourier Transform (DFT) can be inaccurate in these conditions due to its inherent drawbacks such as the requirement of long data window for high resolution and the side lobe leakage in frequency domain. In this paper, a high-resolution spectral analysis technique, Prony Analysis (PA), is proposed for broken rotor bar detection in induction machines. The method is described and demonstrated in detail, validated by experimental data, and compared with DFT. Results clearly indicate the advantages of PA over DFT in terms of maintaining a high resolution with a much shorter window and a better frequency estimate accuracy with the same window length.

Original languageEnglish
Pages (from-to)887-900
Number of pages14
JournalMeasurement: Journal of the International Measurement Confederation
Volume43
Issue number7
DOIs
Publication statusPublished - Aug 2010
Externally publishedYes

Keywords

  • Broken rotor bar
  • Frequency estimation
  • Induction machine
  • Prony

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