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Electrical Conductivity Measurements of Lubrication Greases

Thomas Ehrlich

Published by VDM Verlag
ISBN 10: 3639357086 / ISBN 13: 9783639357080
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Title: Electrical Conductivity Measurements of ...

Publisher: VDM Verlag

Binding: Paperback

Book Condition: New

Book Type: Paperback

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Paperback. 72 pages. Dimensions: 8.4in. x 5.8in. x 0.2in.Methods to reduce electrically induced bearing damage rely on special lubricating greases of either low electric conductivity, to suppress parasitic currents, to prevent the build- up of high electric voltages across the bearing. In either case, it is of interest to know the exact conductivity values of those lubricants. However, no technical standard is available so far on measuring electric conductivity of oil or grease at film thicknesses (1 mm and below). In this work, a measurement cell for simulating the electrical regime of a real bearing conceptually is developed and used with a set of greases. The investigated greases had all quite similar specific resistances, which were all within the variation regime of the total set of greases. The measurements worked satisfactorily for gap widths, i. e. lubricating film thicknesses, of 1 mm and 110 mm, respectively. Lubricating films in real bearings typically have a thickness of a few mikrons. Measurements in the test- setup at 1100 mm gap width showed nonsatisfying results in terms of reproducibility. Some causes are further investigated and possible solutions proposed. This item ships from multiple locations. Your book may arrive from Roseburg,OR, La Vergne,TN. Bookseller Inventory # 9783639357080

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Synopsis: Methods to reduce electrically induced bearing damage rely on special lubricating greases of either low electric conductivity, to suppress parasitic currents, to prevent the build- up of high electric voltages across the bearing. In either case, it is of interest to know the exact conductivity values of those lubricants. However, no technical standard is available so far on measuring electric conductivity of oil or grease at film thicknesses (1 mm and below). In this work, a measurement cell for simulating the electrical regime of a real bearing conceptually is developed and used with a set of greases. The investigated greases had all quite similar specific resistances, which were all within the variation regime of the total set of greases. The measurements worked satisfactorily for gap widths, i.e. lubricating film thicknesses, of 1 mm and 1/10 mm, respectively. Lubricating films in real bearings typically have a thickness of a few mikrons. Measurements in the test- setup at 1/100 mm gap width showed nonsatisfying results in terms of reproducibility. Some causes are further investigated and possible solutions proposed.

About the Author: Mehrere praxisbezogene Projekte schon während der Studienzeit, An der TU Wien Schwerpunkt im Bereich Sensorik und Materialwissenschaft.

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