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In this work a study is presented on the detection of failures in the outer race of the bearings of a three-phase induction motor, using the analysis of mechanical variables (vibration and acoustic emission) and electrical (energy efficiency). Specifically, it is proposed to evaluate the expressiveness of the signals in the presence of the fault, applying, as analysis tools for vibration and acoustic emission, the Fourier and Wavelet transforms. The estimation of energy efficiency, from the measurement of voltages and statoric currents, is suggested as an alternative technique for fault detection. Experimental results are presented to observe the proposed strategies, evaluating the credibility of the fault detection with the motor running on the network and without load, with static load (vibration and acoustic emission) and dynamic load (energy efficiency).

Estratégias para Detecção de Falhas em Rolamentos de Motores de Indução Trifásicos