Motor bearing diagnostics performed by means of laser vibrometer

Damage of bearings is the most common cause of failures in squirrel-cage induction motors. That is why the issues connected with diagnostics of bearings are so important. The equipment employed for bearing diagnostics usually makes use of vibrations as the criterion for technical condition of the bearings. This paper presents exemplary results of the research conducted on bearings with artificially introduced damage. A scanning laser vibrometer PSV-400 Polytec has been used for vibration measurements. The research of technical condition of the same bearings was simultaneously carried out with the usage of DREAM - a vibration diagnostics system.