Diagnóstico de la condición de las barras de motores de inducción

Abstract

The aim of this study is to compare three techniques to diagnose damaged bars in a squirrel cage rotor. They are the current analysis, the instantaneous angular speed analysis and vibration analysis. A theoretical and bibliographical research was conducted where the three techniques were studied. The experimental validation is performed on test benches. A rotor bar is expressly damaged from a small value to completely cut, and then each technique performance in the detection of the problem was evaluated. The mechanical vibration analysis showed to require a substantially higher damage level than the two other techniques to detect the problem. In this case, the technique based on instantaneous angular speed showed to be the most incipient of the three, as it was able to detect damage as small as porosities in the bars.