Fault Detection in Induction Machines Using Power Spectral Density in Wavelet Decomposition

  • Jordi Cusidó, Luis Romeral J
  • Javier A. Rosero A
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Motor-current-signature analysis has been success- fully used in induction machines for fault diagnosis. The method, however, does not always achieve good results when the speed or the load torque is not constant, because this causes variations on the motor-slip and fast Fourier transform problems appear due to a nonstationary signal. This paper proposes a new method for motor fault detection, which analyzes the spectrogram based on a short-time Fourier transform and a further combination of wavelet and power-spectral-density (PSD) techniques, which consume a smaller amount of processing power. The proposed algorithms have been applied to detect broken rotor bars as well as shorted turns. Besides, a merit factor based on PSD is introduced as a novel approach for condition monitoring, and a further implementation of the algorithm is proposed. Theoretical development and experimental results are provided to support the research.

Author-supplied keywords

  • (DWT)
  • Bars
  • Broken rotor bars
  • Fast Fourier transforms
  • Fault diagnosis
  • Fourier transforms
  • Induction machines
  • Rotors
  • Spectrogram
  • Torque
  • Wavelet analysis
  • condition monitoring
  • discrete wavelet transform
  • discrete wavelet transform (DWT)
  • electrical drives
  • fault detection
  • induction motor
  • induction motors
  • power spectral density
  • power spectral density (PSD)
  • short-time Fourier transform
  • shorted windings
  • spectral analysis
  • spectrogram analysis
  • wavelet decomposition
  • wavelet transforms

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  • Juan A. Ortega Jordi Cusidó, Luis Romeral

  • Antonio García Espinosa Javier A. Rosero

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