Results 291 to 300 of about 26,042 (328)

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

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
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

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

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
openaire   +1 more source

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.
openaire   +1 more source

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

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
openaire   +1 more source

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
openaire   +1 more source