Abstract
Induction motors are one of the main pieces of electromechanical energy conversion equipment, as they show features such as high reliability, long life, and robustness. One of the main techniques for identifying non-compliances in these rotary machines is vibration-based condition monitoring. The paper has focused on squirrel-cage broken bars, a typical fault in induction motors. Using an experimental set up in which this fault may be gradually introduced in a healthy motor, the paper shows how this fault changes the vibration pattern, in both time and frequency domains. The methodology based on motor current signature analysis, was modified and applied to the mechanical vibration signals. It has shown as adequate effectiveness for detecting faults when the motor load is higher than 37.5% of the nominal value. Besides that, the frequencies characteristics of the fault were found and demonstrated how important is the motor operation regime.
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