Results 251 to 260 of about 19,374 (297)

The Conduction of Current in Bearings

A S L E Transactions, 1959
Presented as an American Society of Lubrication Engineers paper at the Lubrication Conference held in Los Angles, Calif., October, 1958.
H. N. Kaufman, J. Boyd
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Bearing currents in converter operation

The XIX International Conference on Electrical Machines - ICEM 2010, 2010
The basic inter-relationships, which are required to investigate the cross-system subject of “bearing currents in converter operation”, are discussed in this paper. In order to obtain an integrated overview of the situation, it is decisive that the main points of investigation that are discussed are combined and viewed holistically.
H. Tischmacher, S. Gattermann
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On inverter induced bearing currents, bearing maintenance scheduling, and prognosis

2014 International Conference on Electrical Machines (ICEM), 2014
In this review we discuss the steps that are necessary to proceed from understanding the inception and evolution bearing faults, caused chiefly by bearing currents, and the advantages of the accurate estimation of the remaining useful life over fault detection.
A. Muetze, E. G. Strangas
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Influence of bearing currents on the bearing lifetime for converter driven machines

2012 XXth International Conference on Electrical Machines, 2012
The possibility to calculate motor bearing currents from motor geometry and the mechanisms that lead to these currents are known today [1], [2]. The precise mechanical and electrical procedures which lead to the well known corrugated patterns, a “mountain/valley” structure in the bearing raceway, which reduces the bearing lifetime, are still unknown ...
M. Kriese, E. Wittek, S. Gattermann, H. Tischmacher, G. Poll, B. Ponick   +5 more
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An overview of shaft voltages and bearing currents in rotating machines

2016 IEEE Industry Applications Society Annual Meeting, 2016
Shaft voltages and associated "shaft currents" or "bearing currents" have been known since more than a century on DC and AC motors under classical line operation. More recently with the emergence of inverter drives, there has been an increase of high-frequencies bearing currents and shaft voltages creating mainly premature failure of bearings. Although
Thibaud Plazenet, Thierry Boileau, Cyrille Caironi, Babak Nahid-Mobarakeh   +3 more
openaire   +2 more sources

Characteristics of Shaft Voltage and Bearing Currents

IEEE Industry Applications Magazine, 1997
This article reviews investigations into reduced bearing life due to voltage source adjustable speed drive (ASD) AC motor operation. Relevant bearing failure mechanisms and indicators are discussed. dv/dt and electric discharge machining (EDM) contributions are discussed and experimental data presented showing the voltage levels on motor shafts when ...
Dave Busse, Jay Erdman, Russ Kerkman, Dave Schlegal, Gary Skibinski   +4 more
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Antiforce Current Bearing Waves

2012
In the case of breakdown waves in a long discharge tube, near the electrode where the potential gradient in the gas is greatest, small quantity of gas is ionized. Analysis of the spectrum of radiation emitted from electric breakdown of a gas reveals no Doppler shift, indicating that the ions have negligible motion. The large difference in mobilities of
M. Hemmati, W. Childs, H. Shojaei, D. Waters   +3 more
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Detection of balls bearing Incipient defect by current analysis

IECON 2021 – 47th Annual Conference of the IEEE Industrial Electronics Society, 2021
The bearing problem is considered as the first factor responsible of defects in the electric machines. Traditionally, rolling monitoring is based on the analysis of vibration signals requiring sensors around the machine. The objective of our research work is based on the analysis of electromagnetic signals (current, voltage, stray flux) to detect ...
Mahamad Hassan Gaditto, Bruno Vacossin, Amine Yazidi, Humberto Henao, Franck Betin, Eric Segard   +5 more
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Statistical approach to discharge bearing currents

COMPEL - The international journal for computation and mathematics in electrical and electronic engineering, 2010
PurposeThe purpose of this paper is to propose a statistical approach, which enables the prediction of the risk of the appearance of discharge bearing currents in a given drive that can damage the motor bearings. Using such an approach, the drives for the decisive but expensive, long‐term destructive investigations can be selected.
Robert Smolenski, Adam Kempski, Jacek Bojarski   +2 more
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Analysis of an Eddy Current Journal Bearing

Journal of Tribology, 1988
Nearly all magnetic bearings which have found use in modern technology are based on the attractive force between a magnet and a magnetic material. A distinct disadvantage is that such devices are inherently unstable and require active feedback for operation.
K. A. Connor, J. A. Tichy
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