Results 241 to 250 of about 12,282 (285)

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
openaire   +1 more source

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

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

Study on effect of neutral voltages on shaft voltages causing bearing currents

IECON 2013 - 39th Annual Conference of the IEEE Industrial Electronics Society, 2013
This paper investigates that effect of neutral voltage on shaft voltages. The shaft voltages are expected to provide cause of bearing currents. The bearing currents damage bearing in motor. We expect neutral voltages to cause shaft voltages. Thus, we construct circuit of interior motor.
Takuya Katayama, Takeki Ogitsu, Hikaru Kokumai, Hiroshi Takemura, Tomohiro Nakayama, Hiroshi Mizoguchi   +5 more
openaire   +1 more source

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
Thibaud Plazenet, Thierry Boileau, Cyrille Caironi, Babak Nahid-Mobarakeh   +3 more
openaire   +2 more sources

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 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.
openaire   +2 more sources

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
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 ...
openaire   +1 more source

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   +1 more source