Capacitances and lubricant film thicknesses of motor bearings under different operating conditions

authored by: Eike Christian Wittek, Michael Kriese, Hans Tischmacher, Sven Gattermann, Bernd Ponick, Gerhard Poll
Abstract: Motor bearings in industrial converter-fed threephase motors are mostly equipped with grease-lubricated roller bearings. It is known that under certain operating conditions bearing currents flow that can damage the bearings. When estimating the danger of damaging bearing currents it is important to look at the thickness and the capacitance of the lubricant film as well as the electrical parameters of the drive system. Calculating the thickness of the lubricant film for grease-lubricated bearings is problematical. This paper discusses how this quantity can be determined based on the bearing capacitance. After a brief introduction into the theory of lubricant film formation, the results of extensive tests are presented regarding the dependency of the bearing capacitance on temperature and speed.
Organisation(s): Institute of Drive Systems and Power Electronics
Institute of Machine Elements and Engineering Design
External Organisation(s): Siemens AG
Type: Conference contribution
Publication date: 2010
Publication status: Published
Peer reviewed: Yes
ASJC Scopus subject areas: Electrical and Electronic Engineering, Mechanical Engineering
Electronic version(s): https://doi.org/10.1109/ICELMACH.2010.5608142 (Access: Closed)

BibTeX

@inproceedings{d604fa80edaf4c16953b766f24642eff,
title = "Capacitances and lubricant film thicknesses of motor bearings under different operating conditions",
abstract = "Motor bearings in industrial converter-fed threephase motors are mostly equipped with grease-lubricated roller bearings. It is known that under certain operating conditions bearing currents flow that can damage the bearings. When estimating the danger of damaging bearing currents it is important to look at the thickness and the capacitance of the lubricant film as well as the electrical parameters of the drive system. Calculating the thickness of the lubricant film for grease-lubricated bearings is problematical. This paper discusses how this quantity can be determined based on the bearing capacitance. After a brief introduction into the theory of lubricant film formation, the results of extensive tests are presented regarding the dependency of the bearing capacitance on temperature and speed.",
keywords = "Bearing currents, Bearings, Capacitance measurement, Induction motor, Induction motor drives, Lubrication",
author = "Wittek, {Eike Christian} and Michael Kriese and Hans Tischmacher and Sven Gattermann and Bernd Ponick and Gerhard Poll",
note = "Copyright: Copyright 2010 Elsevier B.V., All rights reserved.; 19th International Conference on Electrical Machines, ICEM 2010 ; Conference date: 06-09-2010 Through 08-09-2010",
year = "2010",
doi = "10.1109/ICELMACH.2010.5608142",
language = "English",
isbn = "9781424441754",
series = "19th International Conference on Electrical Machines, ICEM 2010",
booktitle = "19th International Conference on Electrical Machines, ICEM 2010",
}