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Bearing currents in wind turbine generators
Journal of Renewable and Sustainable Energy, 2013Increasing the availability of multi-megawatt wind turbines (WT) is necessary if the cost of energy generated by wind is to be reduced. It has been found that WT generator bearings have a surprisingly high failure rate, with failures happening too early to be due to classical rolling contact fatigue.
M. Whittle, J. Trevelyan, P. J. Tavner
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The Conduction of Current in Bearings
A S L E Transactions, 1959Presented 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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Statistical approach to discharge bearing currents
COMPEL - The international journal for computation and mathematics in electrical and electronic engineering, 2010PurposeThe 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 +2 more
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Bearing Fault Detection via Autoregressive Stator Current Modeling
IEEE Transactions on Industry Applications, 2004This research proposes a method for detecting developing bearing faults via stator current. Current-based condition monitoring offers significant economic savings and implementation advantages over vibration-based techniques. This method begins by filtering the stator current to remove most of the significant frequency content unrelated to bearing ...
J.R. Stack, T.G. Habetler, R.G. Harley
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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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Geometric Effects on Eddy Current Bearing Performance
Journal of Tribology, 1989The properties of magnetic bearings, particularly those based on repulsive forces due to eddy currents, are determined by a complex mixture of electrical and mechanical length and time scales. A perturbation solution for the magnetic field structure based on careful ordering of these parameters has permitted the effects of realistic gap geometries to ...
J. A. Tichy, K. A. Connor
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Inverter driven induction motor bearing current solutions
Record of Conference Papers. Industry Applications Society. Forty-Ninth Annual Conference. 2002 Petroleum and Chemical Industry Technical Conference, 2003Bearing currents in induction motors can result in premature bearing failure. In this paper, the sources of sine wave and inverter driven motor bearing currents and the potential current paths are identified. These current paths are shown to flow through what are commonly considered to be electrical insulators.
R.F. Schiferl, M.J. Melfi, J.S. Wang
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Current limits of PTFE in sliding bearings
IABSE Reports, 2010<p>The European standard EN 1337 on bridge bearings is supported by experimental studies dating to the ‘70s and the ‘80s, which are not suitable to account for recent issues relevant to operations of steel–PTFE bridge bearings under extreme conditions, like high environment temperatures or high velocities of sliding.
QUAGLINI, VIRGINIO +4 more
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Characteristics of Shaft Voltage and Bearing Currents
IEEE Industry Applications Magazine, 1997This 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 +4 more
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Current Practice in Journal Bearings
1969It is advantageous from the production point of view for a manufacturer to use one standard design of journal bearing, made in a small number of standard sizes. The degree of standardization attained is, however, limited by other considerations. The economic benefits of reduction of machine dimensions and of reduction of bearing loss justify the use of
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