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Calculation of Influence of Insulated Bearings and Insulated Inner Bearing Seats on Circulating Bearing Currents in Machines of Inverter-Based Drive Systems.
- Source :
-
IEEE Transactions on Industry Applications . Jul/Aug2006, Vol. 42 Issue 4, p965-972. 8p. 2 Black and White Photographs, 11 Diagrams, 7 Charts, 2 Graphs. - Publication Year :
- 2006
-
Abstract
- The high-frequency (HF) circulating bearing current that may occur in the machines of the inverter-based drive systems can be reduced or even completely suppressed by the use of the electrically insulated bearings or the insulated inner bearing seats. This paper proposes a method to calculate the influence of the thickness of the insulating coat on the obtained current reduction as a function of the several machine-design parameters. The parameters of the equivalent circuit are derived from an eddy-current model. The calculation considers the transient nature of the current flow. For the standard fan-cooled motors with up to 500-kW rated power, a minimum thickness of the insulating coat of 250 μm is required to reduce the circulating bearing currents to values where the apparent bearing-current density is less than 0.1 A/mm², which is commonly taken as the threshold to the bearing failure. [ABSTRACT FROM AUTHOR]
Details
- Language :
- English
- ISSN :
- 00939994
- Volume :
- 42
- Issue :
- 4
- Database :
- Academic Search Index
- Journal :
- IEEE Transactions on Industry Applications
- Publication Type :
- Academic Journal
- Accession number :
- 21799389
- Full Text :
- https://doi.org/10.1109/TIA.2006.876083