Results 41 to 50 of about 1,780,109 (186)

Assessment and Mitigation of Non-Circulating Bearing Currents in Bridgeless Rotor Synchronous Reluctance Machine [PDF]

Bearing currents in electric machines can lead to surface damage to bearings and eventual machine failure. Non-circulating bearing currents resulting from high-frequency common-mode voltages interacting with parasitic capacitances are particularly ...
Pyrhönen, Juha, Parviainen, Miika, Vostrov, Konstantin, Nutakor, Charles, Lindh, Pia, Sopanen, Jussi   +5 more
core   +1 more source

Experimental Investigation of the Impact of Cable Length and Type on Motor Overvoltages, Shaft Voltage, and Bearing Currents in PWM-Inverter-Fed Drive Systems

Machines
Fast-switching transients and high dv/dt associated with PWM inverters exacerbate the reflected-wave effects in the motor feeder cable. This leads to higher motor-side overvoltages, which increase the stress on the motor winding insulation, potentially ...
Fawzy A. Abdo, Mehmet Güleç, Kotb B. Tawfiq, Peter Sergeant   +3 more
doaj   +1 more source

Microwave response of a metallic superconductor subject to a high-voltage gate electrode

Scientific Reports, 2022
Processes that lead to the critical-current suppression and change of impedance of a superconductor under the application of an external voltage is an active area of research, especially due to various possible technological applications.
Giacomo Catto, Wei Liu, Suman Kundu, Valtteri Lahtinen, Visa Vesterinen, Mikko Möttönen   +5 more
doaj   +1 more source

Air‐Pressure–Actuated Vibroacoustic Metamaterial With Tunable Bandgap: Design, Modeling, and Characterization

Advanced Engineering Materials, EarlyView.
This article presents the design, modeling, and characterization of air‐pressure–actuated programmable vibroacoustic metamaterials (PVAMM). The study focuses on leveraging air pressure to dynamically tune resonance frequencies for effective noise attenuation.
William Kaal, Michael M. Becker, Sarah C. L. Fischer   +2 more
wiley   +1 more source

Electrodynamics of an omega-band as deduced from optical and magnetometer data [PDF]

, 2009
We investigate an omega-band event that took place above northern Scandinavia around 02:00–02:30 UT on 9 March 1999. In our analysis we use ground based magnetometer, optical and riometer measurements together with satellite based optical images.
A. Senior, S. Milan, Kauristie, K., Senior, A., Vanhamaki, H., Milan, S., O. Amm, D. Lummerzheim, Lummerzheim, D., K. Kauristie, H. Vanhamäki, Amm, O.   +11 more
core   +2 more sources

Common-Mode Choke Design to Eliminate Electrostatic Discharge Machining Bearing Currents in Wide-Bandgap Inverter-Fed Motor Drives

Energies
The electrification of mobility sectors, including automotive, aerospace, and robotics, has accelerated the need for compact and high-efficiency power converters in electric motor drives. Wide-bandgap (WBG) semiconductor–based inverters offer significant
Mustafa Memon, Mohamed Diab
doaj   +1 more source

Field Report from Collaborative Research Center 1625: Heterogeneous Research Data Management Using Ontology Representations

Advanced Engineering Materials, EarlyView.
A unified research data management framework for heterogeneous materials data is presented. The system integrates multimodal datasets using ontologies and knowledge graphs, enabling interoperability and FAIR (findable, accessible, interoperable, reusable) data principles. By linking data across scales and workflows, it supports reproducible, Artifitial
Doaa Mohamed, Samuel García Vázquez, Behnam Mardani, Victor Dudarev, Alfred Ludwig, Maribel Acosta, Markus Stricker   +6 more
wiley   +1 more source

Fostering Innovation: Streamlining Magnetocaloric Materials Research by Digitalization

Advanced Engineering Materials, EarlyView.
Magnetocaloric cooling (MCE) is an environmentally friendly refrigeration method with great potential. Optimizing MCE materials involves the preparation and screening of large quantities of samples, which in turn generates a large amount of data. A digitalization approach is presented that uses ontologies, knowledge graphs, and digital workflows to ...
Simon Bekemeier, Moritz Blum, Luana Caron, Alisa Chirkova, Philipp Cimiano, Basil Ell, Inga Ennen, Michael Feige, Maik Gaerner, Thomas Hilbig, Andreas Hütten, Günter Reiss, Tapas Samanta, Sonja Schöning, Christian Schröder, Lennart Schwan, Chris Taake, Martin Wortmann   +17 more
wiley   +1 more source

Influence of Electric Discharges on Bearings of Electric Machina

Advances in Electrical and Electronic Engineering, 2008
Bearing currents are one of cause’s bearings faults. The character of a lubricator belongs to main factor influencing an inception of bearing currents. We have analyzed the electric character variety kind of lubricators; the influence of lubricators on a
Jiri Foldyna, Karel Chmelik, Stanislav Misak   +2 more
doaj  

Evaluation of Current Signature in Bearing Defects by Envelope Analysis of the Vibration in Induction Motors

Energies, 2019
Motor current signature analysis (MCSA) enables non-invasive monitoring, without interruption of machine operation in a remote and online way, allowing the identification of various types of faults of electrical and mechanical nature without the need of ...
Isac Antônio dos Santos Areias, Luiz Eduardo Borges da Silva, Erik Leandro Bonaldi, Levy Ely de Lacerda de Oliveira, Germano Lambert-Torres, Vitor Almeida Bernardes   +5 more
doaj   +1 more source