Results 251 to 260 of about 12,282 (285)

Shaft voltages and rotating machinery

Industry Applications Society 38th Annual Petroleum and Chemical Industry Conference, 1993
In order to determine whether a machine is experiencing shaft voltage and current problems, recognition of the four types of damage is imperative. The four distinct types of shaft current damage, frosting, spark tracks, pitting, and welding are described. The four shaft voltage sources and their means of generation are discussed in detail.
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Study of shaft voltage of a simplified synchronous generator

International Journal of Applied Electromagnetics and Mechanics, 2019
Shaft voltage is a well-known variable in the case of large turbo-generators for its potential destructive effect. However, as it is due to magnetic asymmetries, its use as a diagnosis indicator can be very interesting. Previous works were carried out to investigate the harmonic contents of this voltage in the case of some usual defects such as ...
Darques, Kévin, Tounzi, Abdelmounaïm, Le Menach, Yvonnick, Beddek, Karim   +3 more
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Analysis of shaft voltages in large synchronous generators

IEEE International Electric Machines and Drives Conference. IEMDC'99. Proceedings (Cat. No.99EX272), 2003
In order to improve maintenance of large turbogenerators, a new diagnostic tool is developed by analysing shaft voltages. This study is validated by a comparison between the measurements made on a 30 kVA synchronous machine and its modelling with a finite element program.
J.-E. Torlay, C. Corenwinder, A. Audoli, J. Herigault, A. Foggia   +4 more
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A Review of Shaft Voltages and Bearing Currents in EV and HEV Motors

IECON 2016 - 42nd Annual Conference of the IEEE Industrial Electronics Society, 2016
In most mechanical and electrical systems, reliability is paramount. Consumers, users and operators trust that their product will perform properly over its expected lifetime. Electric Vehicles (EVs) and Hybrid-Electric Vehicles (HEVs) are no exception to this statement.
Trevor Hadden, James Weisheng Jiang, Berker Bilgin, Yinye Yang, Anand Sathyan, Hossein Dadkhah, Ali Emadi   +6 more
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Electrostatic Shaft Voltage on Steam-Turbine Rotors

Journal of Engineering for Power, 1959
Several different types of shaft voltages can be present on steam-turbine rotors. The one type that has gained increased significance in the past five years is the direct-current or electrostatic voltage. Prior to this period, electrostatic shaft voltage had not been a problem.
J. M. Gruber, E. F. Hansen
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A complete excitation-shaft-bearing model to overcome the shaft induced voltage and bearing current

2011 2nd Power Electronics, Drive Systems and Technologies Conference, 2011
This paper proposes a complete distributed model for investigating the induced shaft voltage and bearing current in turbo generators due to the interaction with the static excitation systems. This undesirable voltage affects the insulations gradually, lowering the life expectancy of the whole system.
Reza Kazemi Golkhandan, Mohammad Tavakoli Bina, Masoud Aliakbar Golkar, Mohsen Jokar   +3 more
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Mitigation method of the shaft voltage according to parasitic capacitance of the PMSM

2016 IEEE Energy Conversion Congress and Exposition (ECCE), 2016
In this study, we propose the mitigation method of a shaft voltage according to change in parasitic capacitances of a permanent magnet synchronous motor (PMSM). First, we designed the equivalent circuit taking into account all parasitic capacitances.
Jun-kyu Park, Thusitha Randima Wellawatta, Sung-Jin Choi, Jin Hur   +3 more
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Converter Caused Shaft Voltages

2013
Parasitic effects caused by static frequency converters, like electromagnetic interference (EMI), may endanger the reliable operation of electrical machines up to 500 MVA. They can cause shaft voltages up to 300 Vpp, if a non optimized converter design is chosen. Shaft voltages occur in converter fed drives due to different effects [7.1-7.9].
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An influence of voltage sag on nonutility generator shaft torque

2000 Power Engineering Society Summer Meeting (Cat. No.00CH37134), 2002
An influence of the voltage sag on the shaft torque of the nonutility generator connecting to the utility system is investigated. During the oscillation of the generator electromagnetic torque, the mechanical shaft torque also oscillates according to the mechanical oscillation modes. In this situation, the shaft might be damaged.
T. Funabashi, H. Otoguro, T. Tanabe, G. Fujita, K. Koyanagi, R. Yokoyama   +5 more
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Shaft current and voltage protection relay

2014
The paper deals with the specific protection relay for all types of generators. The instrument, called Shaft Current and Voltage Protection Relay (SCVP) was developed at KONCAR – Electric Engineering Institute Inc. This instrument is a part of Institute's product line used for monitoring and diagnosis of rotating electrical machines. The most important
Elez, Ante, Polak, Josip
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