Results 241 to 250 of about 19,374 (297)
Refining fibroblast-to-cardiomyocyte transdifferentiation protocols to explore emergent self-organization in cardiac cultures. [PDF]
PLoS OneTurchaninova E +13 more
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Numerical backup protection scheme based on alienation indices of voltage and current measurements practically applied to synchronous generators. [PDF]
Sci RepMahmoud RA, Salama MAE.
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Application guide bearing currents [PDF]
, 2021 This application guide bearing currents is intended to provide an overview of electrical bearing current effects in rolling bearings, related to bearing damage, concerning the questions: - Which typical failures occur due to bearing currents? - What are electrical bearing currents? - How do electrical bearing currents occur?
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Bearing currents and their relationship to PWM drives
IEEE Transactions on Power Electronics, 1997This paper examines AC motor shaft voltages and the resulting bearing currents when operated under pulse width modulation (PWM) voltage source inverters. The paper reviews the mechanical and electrical characteristics of the bearings and motor in relation to shaft voltages and bearing currents.
R J Kerkman, D Schlegel, G Skibinski
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Conference Record of the 2004 IEEE Industry Applications Conference, 2004. 39th IAS Annual Meeting., 2004 Statements on the mechanism of the endangerment of bearings due to inverter-induced bearing currents nearly do not exist today. Therefore, a series of 22 test runs for bearing damage assessment was carried out. The influence of bearing current amplitude and type, calculated apparent bearing current density, time of operation and inverter switching ...
A. Muetze +3 more
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Induction Motor Bearing Currents - Causes and Damages
2021 28th International Workshop on Electric Drives: Improving Reliability of Electric Drives (IWED), 2021Bearing damages make the biggest proportion of faults affecting AC electrical motors. There are various subdivisions of the bearing faults but one of them is the induced bearing and shaft currents in the machines. These currents cannot be fully avoided, yet with the development of power electronic control of the machines, the number of machines ...
Kudelina, Karolina +6 more
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Investigation of influence of bearing load and bearing temperature on EDM bearing currents
2010 IEEE Energy Conversion Congress and Exposition, 2010To detect the worst case and the best case of the bearing operating conditions concerning the magnitude of the high frequency discharge bearing currents (“EDM currents”) and the frequency of electric discharges in the bearings of the small power inverter-fed AC motors, systematic investigations have been performed for three, 4-pole, 1.5 kW squirrel ...
Oliver Magdun +2 more
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Bearing wear caused by converter-induced bearing currents
IECON 2010 - 36th Annual Conference on IEEE Industrial Electronics Society, 2010The basic interrelationships that are required to investigate the cross-system subject of “bearing currents in converter operation”, are discussed in this paper. In order to obtain an integrated overview of the situation, it is decisive that the main points of the investigation are not discussed individually, but must be considered from an overall ...
H. Tischmacher +3 more
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Calculation of Circulating Bearing Currents in Machines of Inverter-Based Drive Systems
IEEE Transactions on Industrial Electronics, 2007 The high-frequency circulating bearing current that may occur in machines of inverter-based drive systems can be described by an eddy-current model. The parameters of an equivalent circuit are derived from the model. The ratio between bearing current and
Annette Muetze, Andreas Binder
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