Wavelet analysis, new signal processing method, used for detection a broken rotor bars in AC motor

  • Authors:

  • Eleonora Darie;Emanuel Darie

  • Affiliations:

  • Electrotechnical Department, Technical University of Civil Engineering, Bucharest, Romania;Engineering Department, Police Academy, Bucharest, Romania

  • Venue:
  • CIS'09 Proceedings of the international conference on Computational and information science 2009
  • Year:
  • 2009

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Abstract

This work describes a useful method for detection broken rotor bars in AC motors. The start-up transient current of an induction machine is used as the medium for diagnoses. The fundamental component is extracted using an algorithm that predicts the instantaneous amplitude and frequency during start-up. The residual current is then analyzed using wavelets and a comparison is made between a healthy and damaged machine. This method of machine condition monitoring is not load dependant and can be used for machines that are unloaded.