Results 291 to 300 of about 26,094 (339)

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
Plazenet, Thibaud, Boileau, Thierry, Caironi, Cyrille, Nahid-Mobarakeh, Babak   +3 more
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Motor shaft voltages and bearing currents and their reduction in multilevel medium-voltage PWM voltage-source-inverter drive applications

IEEE Transactions on Industry Applications, 2000
This paper presents test results on problems and solutions of motor shaft voltages and bearing currents in medium-voltage pulsewidth modulated (PWM) drive systems. Tests show that multilevel medium-voltage PWM voltage-source inverter drives can cause motor bearing currents, similar to a low-voltage PWM drives, even with one motor bearing insulated ...
Fei Wang
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Monitoring of shaft voltages and grounding currents in rotating machines

2014 17th International Conference on Electrical Machines and Systems (ICEMS), 2014
The phenomenon of voltages and currents on motor and generator shafts has been known for the last 100 years [1, 2]. It affects motors, hydro generators and turbo generators. There has been an increase in occurrences and intensity of shaft current damages as machines became larger, particularly on high speed turbo generators.
Greg Stone, Blake Lloyd, Mladen Sasic
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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
openaire   +1 more source

Turboalternator shaft voltage measurements

2012 IEEE International Workshop on Applied Measurements for Power Systems (AMPS) Proceedings, 2012
This paper presents the results of shaft voltages measurement campaign undertaken to investigate the sources of unrecoverable temperature drift observed on the thrust bearing of a small industrial steam turbine of a turbogenerator installed in a cogeneration biomass thermal power station.
D'ANTONA, GABRIELE, PENNACCHI, PAOLO EMILIO LINO MARIA, C. Pensieri, C. Rolla   +3 more
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Non-contact Measurement for Shaft Voltages

2024 International Symposium on Electromagnetic Compatibility – EMC Europe
Kensuke Kobayashi, Youhei Sekiya, Shinji Ohoka, Keisuke Sawazaki, Hiroto Mizutani, Yuji Mochizuki, Ryo Okano   +6 more
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Frame-to-Shaft Voltage and End-to-End Shaft Voltage Analysis According to Eccentricity in IPMSMs

2018 IEEE Energy Conversion Congress and Exposition (ECCE), 2018
Common-mode voltage (CMV) by switching pattern of space vector pulse width modulation (SVPWM) excites the parasitic capacitance links in the motor and results in frame-to-shaft voltage. In addition, asymmetric magnetic fields by common-mode current (CMI), eccentricity, and demagnetization causes the end-to-end shaft voltage.
Jun-Kyu Park, Chae-Lim Jeong, Nicola Bianchi, Jin Hur   +3 more
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Determination of shaft position from shaft voltage on a synchronous generator

2005 5th IEEE International Symposium on Diagnostics for Electric Machines, Power Electronics and Drives, 2005
Shaft voltages and currents are an unavoidable characteristic of rotating machines. Recently there has been renewed interest in the diagnostic possibilities of these signals. This paper presents a technique to determine the mechanical shaft position using a capture of the shaft voltage and a mechanically aligned pre-recorded reference.
Simon J. Hoffe, Alan S. Meyer, Willie A. Cronje   +2 more
openaire   +1 more source

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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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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