Detection of Broken Bars in Railway Induction Motors Fed by Frequency Converter Using Spectral Analysis of Line Current

Duque-Perez, Oscar; Morinigo-Sotelo, Daniel; Perez-Alonso, Marcelo
April 2012
International Review on Modelling & Simulations;Apr2012, Vol. 5 Issue 2, p959
Academic Journal
Induction motors fed by Voltage Source Inverters are widely used nowadays in railway locomotives. Detection of faults in induction motors based on spectral analysis of line current is a well-known technique in the case of sinusoidal supply, but the use of inverters makes necessary to modify the existing fault detection methods. In this paper, it is analysed the influence of broken bars on line current spectra and propose a formulation for the calculation of the characteristic fault frequencies. Next, it is experimentally verified this formulation with tests of locomotive motor drives fed by a six-step converter. The proposed technique can be used on-line, providing early detection of faults avoiding catastrophic consequences and is specially adapted for the maintenance personnel, since a fault condition is detected observing the spectra. So it is not necessary to perform precise measures or further spectral analysis.


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