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Información tecnológica

On-line version ISSN 0718-0764


FLORES, Roberto  and  ASIAIN, Tomás I. Fault Diagnosis in Rotating Electrical Machines by Side Bands Frequency Spectra Technique . Inf. tecnol. [online]. 2011, vol.22, n.4, pp.73-84. ISSN 0718-0764.

In this article a methodology to diagnose faults in rotating electrical machines is presented. The method uses spectral frequency analysis of the phase currents sidebands. Online systems to verify the magnitude of these frequencies, caused not only by mechanical faults but also electrical faults, are presented. The results of a faulty set formed by a direct current motor plus a synchronous generator of 5 kVA and two squirrel-cage induction motors of 5 HP, one with slacked bearings faults and other with broken rotor bars, are presented. Also, the results of the spectra using a conventional current sensor are compared with those of a Rogowski coil, showing that the results of both sensors are suitable to detect machine faults.

Keywords : spectral analysis; sidebands; faults; synchronous generator; induction motor.

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