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The machine's air-gap cannot be perfectly smooth. Since a static or a dynamic eccentricity occurs, a mixed eccentricity behavior is observed and manifests by amplitude modulation of the stator current. Many other failures related to the motor condition or its driven load produce this same effect. Hence, by loading an induction machine, eccentricities incidence may be masked. Furthermore, because of...
In this work we discuss the efficiency of various stator current signatures for monitoring shaft misalignment that could affect mechanical systems when driven by an induction machine speed-controlled. In that respect, we have considered the Motor Current Signature Analysis, the Current Space Vector, and the Current Park Loci, under no-load as well as under full load conditions. On the other hand,...
Vibration analysis is the most used technique for gearbox fault diagnosis based on gear meshing frequency (GMF) magnitude tracking. The originality of this paper is illustrated in two steps. The meshing between two damaged teeth repeating to the Hunting tooth frequency (HTF) is clearly detected by performing spectral analysis to vibration envelope signal and the motor stator current, unlike the confirmation...
In this work we have shown that the extended Park's vector spectrum is rich in harmonics characteristics of mechanical defects (air-gap eccentricity and outer raceway bearing fault). About the use of Park's Lissajou's curves to identify mechanical defects, we have demonstrated that this type of index can only detect the occurrence of a fault, but it cannot identify.
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