Results 231 to 240 of about 1,002,747 (273)

Induction Motor Shaft-Frame Voltage Analysis

2021 IEEE Energy Conversion Congress and Exposition (ECCE), 2021
Most three-phase, squirrel-cage, induction motor (SCIM) fault diagnosis/detection techniques are based on the analysis of the stator currents and/or frame mechanical vibration. In this paper, a preliminary theoretical and experimental analysis of the shaft-frame voltage (SFV) in line-fed SCIMs, as a potential fault diagnosis and/or condition monitoring
Ferreira Fernando J. T. E., Jose Alberto, Anibal T. de Almeida   +2 more
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Shaft voltages in synchronous Machines

2023
Asymmetries in the magnetic circuits of the stator and rotor cause imbalances in the flux distribution in machines. The effect of this is that voltages are induced in the closed circuit made up by the machine bedplate, the bearing pedestals and the shaft.
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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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A Survey on Shaft Voltage of Large Generator

Applied Mechanics and Materials, 2013
Shaft voltage is widely existed in the operation of generator and needed to pay more attentions. Based on the mechanism of generator shaft voltage, this paper analyses and expounds the harmfulness of shaft voltage and shaft current, then summarizes the prevention and control measures of shaft voltage and the research status.
Ling Chen, Hong Hua Wang, Cheng Liang Wang, Chao Tan   +3 more
openaire   +1 more source

Shaft voltages caused by alternating flux encircling the shaft

Seventh International Conference on Electrical Machines and Drives, 1995
If a voltmeter is connected across the two ends of the shaft of a rotating electrical machine, a small voltage can normally be detected. In many cases this voltage is too small to cause problems, but if it reaches a level at which significant current starts to flow through bearings or other components attached to the shaft, then precautions such as ...
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Diagnosis of turbine generator typical faults by shaft voltage

2012 IEEE Industry Applications Society Annual Meeting, 2012
Relationships between shaft voltages and static eccentricities are studied, theoretical analysis shows that shaft voltages are induced by the ‘distorted fluxes’ caused by static eccentricities, shaft voltages mainly contain odd harmonics, the harmonic amplitudes increase under greater eccentricities.
Yucai Wu, Yonggang Li, Heming Li
openaire   +2 more sources

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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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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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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