Abstract
Recognition of characteristic patterns is proposed in this paper in order to diagnose the presence of electromechanical faults in induction electrical machines. Two common faults are considered; broken rotor bars and mixed eccentricities. The presence of these faults leads to the appearance of frequency components following a very characteristic evolution during the startup transient. The identification and extraction of these characteristic patterns through the Discrete Wavelet Transform (DWT) have been proven to be a reliable methodology for diagnosing the presence of these faults, showing certain advantages in comparison with the classical FFT analysis of the steady-state current. In the paper, a compilation of healthy and faulty cases are presented; they confirm the validity of the approach for the correct diagnosis of a wide range of electromechanical faults.
Highlights
IntroductionElectrical induction machines ( known as asynchronous machines) are deeply spread in many industrial applications
Electrical induction machines are deeply spread in many industrial applications
Studies on the occurrence of electromechanical faults in asynchronous machines [1] show a significant percentage of faulty events related to the rotor, such as rotor asymmetries and various modalities of eccentricities; they have been deeply analyzed in the literature due to their particular hazard caused by the progressive propagation or the possibility of rotor to stator rub [3,4,5]
Summary
Electrical induction machines ( known as asynchronous machines) are deeply spread in many industrial applications. Studies on the occurrence of electromechanical faults in asynchronous machines [1] show a significant percentage of faulty events related to the rotor, such as rotor asymmetries (rotor bar breakages, cracked end rings...) and various modalities of eccentricities (static, dynamic or mixed eccentricities); they have been deeply analyzed in the literature due to their particular hazard caused by the progressive propagation or the possibility of rotor to stator rub [3,4,5] These faults cause some effects in the different electromechanical quantities of the machine (currents, vibrations, fluxes, torque...) which may help to diagnose the presence of the corresponding failure.
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