MCSA to Detect Mechanical Faults of the High Power Set: Induction Motor-Driving Process

Abstract

The asynchronous machine has witnessed a wide spread in various sectors of industrial production these last years. Though it's known by its robustness, the Medium voltage asynchronous motor, and the big sized equipment’s (of metallurgy, cement factory, Petro chemistry) are often subject to mechanical defects much more than electrical ones; bearing, rotor unbalance, and misalignment.

Although the vibratory analysis is usually the richest in the field of research, there are some mechanical faults which show up its limits. This is explained by the damping Sometimes of the measurements carried out on the body of these machines or because of the fact that these failures are at low levels and almost unperceivable. These defects can evolve quickly and lead to an unavailability of the machine, if not the entire industrial system that integrates it. However, the engine supply current can contribute to reveal invaluable information on these types of dysfunctions.

This work is devoted to the diagnosis by the analysis of the stator current signatures of the ideal condition of the asynchronous machine in the presence of the above mentioned mechanical defects. To validate our research, a test bench and some experiments have given us some  analyses and experimental results concerning these usual mechanical failures but difficult to diagnose, and which were carried out artificially on the induction motors of different powers and manufacturers
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