Publications in Scientific Journals:
T. Zika, I. Gebeshuber, F. Buschbeck, G. Preisinger, M. Gröschl:
"Surface analysis on rolling bearings after exposure to defined electric stress";
Proceedings of the Institution of Mechanical Engineers Part J - Journal of Engineering Tribology,
This article gives an overview about classical and frequency converter-induced spurious bearing currents in induction machines and discusses typical damage patterns caused by the current passage. To investigate on the electric damage mechanisms, test bearings are operated in a test rig and exposed to specific (classical low-frequency, and high-frequency) bearing currents. The induced damages to the surfaces are analysed visually and with the help of an atomic force microscope, and compared for the different electric regimes applied. Further, the electrically damaged bearing surfaces are characterized by standard roughness parameters. The surface structure observable on certain test bearings shows good correlation to the structure found with a bearing that had failed in the field under similar electric conditions. One of the investigated electric regimes applying high-frequency currents proved capable of generating fluting patterns - as found in real applications - on the test rig. The experiments also indicate that high-frequency bearing currents, although in total dissipating less energy, are more dangerous to a bearing than continuous current flow. The presented method gives a good starting point for further investigation on electric current damage in bearings, especially regarding high-frequency bearing currents, and on bearing/grease lifetime under specific electric regimes.\
bearing currents, variable-speed drives, common-mode voltage, fluting, electric erosion
Created from the Publication Database of the Vienna University of Technology.