Results 241 to 250 of about 5,196 (283)
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Minimizing electric bearing currents in ASD systems
IEEE Industry Applications Magazine, 1999During recent years, an increase in bearing failures has been seen in ASD-fed electric motors, as well as in gearboxes, and other connected machinery, caused by electric current flow through such bearings. The theories presented in this paper focus on bearing currents in ASDs of the voltage source pulse width modulated (PWM) type, for use with AC ...
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Overview of Bearing White Etching Cracks due to Electrical Currents
2021 IEEE 13th International Symposium on Diagnostics for Electrical Machines, Power Electronics and Drives (SDEMPED), 2021With the development of variable speed drives, motor bearings are submitted to additional stress due to parasitic currents which deteriorate bearing raceways, rolling elements and lubricant. Electrical bearing damage, identified by microcraters resulting in surface degradation of raceways and rolling elements, can occur rapidly under adverse operating ...
Plazenet, Thibaud, Boileau, Thierry
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Influence of Electrical Current on Bearing Flaking Life
SAE Technical Paper Series, 2007<div class="htmlview paragraph">A peculiar type of flaking occasionally occurs on bearings that are used in automotive electrical instruments. This flaking, which is called brittle flaking, is accompanied by a unique microstructure change consisting of a white structure below the surface of the bearing raceway.
Hidenobu Mikami, Takayuki Kawamura
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Modeling and Mitigation of Bearing Currents in Electrical Traction Drives
2020 23rd International Conference on Electrical Machines and Systems (ICEMS), 2020Inverter driven machines are a vital part of electrical traction drives. They are subject to high-frequency parasitic currents, caused by the high-frequency components of the pulse width modulated (PWM) voltage. These currents can flow through the bearings of the machine and cause severe damage.
Stefan Quabeck +2 more
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System electrical parameters and their effects on bearing currents
IEEE Transactions on Industry Applications, 1997This paper examines AC motor shaft voltages and resulting bearing currents when operated under pulse width modulation (PWM) voltage source inverters. The paper reviews the electrical characteristics of bearings and motors that cause shaft voltages and bearing currents.
D. Busse +4 more
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Devices for Prevention of Bearings Devaluation by Electric Current
2007 IEEE International Symposium on Diagnostics for Electric Machines, Power Electronics and Drives, 2007Our target the prevention against bearing currents by use of brush on the motor shaft and insulated bearings is discussed in the paper. The investigations were realized on laboratory machines and also on machines in operation.
K. Chmelik, V. Cech, J. Foldyna
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Traction Motor Bearing Failures Due to Bearing Currents in Electric Locomotives
2019 IEEE Transportation Electrification Conference and Expo (ITEC), 2019This paper is concerned with the analysis, measurement and mitigation methods for bearing current related bearing failures in inverter supplied electric locomotive traction motors. The motivation for the study is a record of premature bearing failures observed in AC traction motors in Indian Railways following a transition from GTO converters to IGBT ...
A. Sundaresan, Mukul Chandorkar
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Influence of High Electrical Currents on WEC Formation in Rolling Bearings
Tribology Transactions, 2021Premature bearing failures due to white etching cracks (WECs) occur when the rolling contact is subjected to a so-called additional load such as an electrical current flow through the bearing in ad...
Joerg Loos, Iris Bergmann, Matthias Goss
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Investigations on bearing currents in converter-fed electrical motors
2012 XXth International Conference on Electrical Machines, 2012As shown in [6], the issue of current flowing through a motor bearing is a system-related topic. Different aspects have to be taken into account to identify countermeasures to avoid or dampen the current flow. Up until now, it is not possible to define clear limits where the changes in the bearing raceways lead to the so called corrugation and with ...
H. Tischmacher, S. Gattermann
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Bearing Wear Due to Mechanical Stresses and Electrical Currents
ASME/STLE 2009 International Joint Tribology Conference, 2009Passage of current through moving conductive contacts results in electrical discharge and then melting of the material, which leads to wear. Such kind of bearing wear is common in electrical machines. There are however certain patterns which are unique to this kind wear. This wear pattern is called ‘fluting’, which are repetitive in nature.
S. Srinidhi +4 more
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