Um estudo sobre diagnóstico de motores de indução através da análise espectral de vibrações

Abstract

Vibration analysis is a tool used to detect and diagnose problems with the operation of a rotating machine. It is generally applied to signals picked up by acceleration sensors and processed in the frequency domain. Although other transformations can lead to particular or incremental gains in relation to the use of the Fast Fourier Transform (FFT), all works are based on or depart from analyzes and concepts in the Fourier and time domains. In view of this, this work proposes a study on vibration analysis in induction motor bearings, in the Fourier and time domains, through spectral and temporal analysis. A review of the fundamentals of this technique is presented, including the mechanical behavior of induction motors, with respect to vibrations, and some analysis techniques. Thus, the studied method is verified through the analysis of vibration signals acquired in experiments with electric motors in which defects of different types were simulated, proving the efficiency of the proposed method, through data obtained both from the time and frequency domains. [resumo fornecido pelo autor]