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Electrical, Control and Communication Engineering

The Journal of Riga Technical University

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2255-9159
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Modeling of Losses Due to Inter-Laminar Short-Circuit Currents in Lamination Stacks

Sahas Bikram Shah / Paavo Rasilo / Anouar Belahcen / Antero Arkkio
Published Online: 2013-09-05 | DOI: https://doi.org/10.2478/ecce-2013-0012

Abstract

The cores of electrical machines are generally punched and laminated to reduce the eddy current losses. These manufacturing processes such as punching and cutting deform the electrical sheets and deteriorate its magnetic properties. Burrs are formed due to plastic deformation of electrical sheets. Burr formed due to punching on the edges of laminated sheets impairs the insulation of adjacent sheet and make random galvanic contacts during the pressing of stacked sheets. The effect of circulating current occurs if the burrs occur on the opposite edges of the stacks of laminated sheets and incase of bolted or wielded sheets, induced current return through it. This induced current causes the additional losses in electrical machine. The existence of surface current on the boundary between two insulated regions causes discontinuity of tangential component of magnetic field. Hence, based on this principle, the boundary layer model was developed to study the additional losses due to galvanic contacts formed by burred edges. The boundary layer model was then coupled with 2-D finite element vector potential formulation and compared with fine mesh layer model. Fine mesh layer model consists of finely space discretized 950028 second order triangular elements. The losses were computed from two models and were obtained similar at 50 Hz. The developed boundary layer model can be further used in electrical machines to study additional losses due to galvanic contacts at the edges of stator cores.

Keywords: Air gaps; eddy currents; finite element analysis; permeability

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About the article

Sahas Bikram Shah

Sahas Bikram Shah was born in Kathmandu, Nepal in 1987. He received the B.Sc. degree in electrical and electronics engineering from Kathmandu University, Nepal in 2010 and the M.Sc. (Tech.) from Aalto University, Espoo, Finland in 2013. His main study includes numerical modeling in electrical machines and electromechanics. He is currently a doctoral student at the Department of Electrical Engineering in Aalto University School of Electrical Engineering. His research includes numerical modeling of iron losses in electrical machines and stochastic analysis of additional losses in electric machines. E-mail: sahas.bikram.shah@aalto.fi Postal address: Aalto University, School of Science and Technology, Department of Electrical Engineering, P.O.Box 13000, FI-00076 Aalto, Finland.

Paavo Rasilo

Paavo Rasilo was born in Äänekoski, Finland in 1983. He received his M.Sc. (Tech.) and D.Sc. (Tech.) degrees from Helsinki University of Technology (currently Aalto University) and Aalto University, Espoo, Finland in 2008 and 2012, respectively. He is currently a post-doctoral researcher at the Department of Electrical Engineering in Aalto University School of Electrical Engineering. His research interests deal with numerical modeling of electrical machines as well as power losses and magnetomechanical effects in soft magnetic materials. Postal address: Aalto University, School of Science and Technology, Department of Electrical Engineering, P.O.Box 13000, FI-00076 Aalto, Finland.

Anouar Belahcen

Anouar Belahcen was born in Morocco, in 1963. He received the B.Sc. degree in physics from the University Sidi Mohamed Ben Abdellah, Fes, Morocco, in 1988 and the M.Sc. (Tech.), LisTech, and Doctorate degrees from Helsinki University of Technorking as Professor in the field of coupled problems and material modeling at the Department of Electrical Engineering, Aalto University, Finland. Since 2011 he is Professor of electrical machines at Tallinn University of Technology, Estonia and in 2013 he became Professor at Aalto University. His research interests deal with the numerical modeling of electrical machines, especially magnetic material modeling, coupled magnetic and mechanical problems, magnetic forces, and magnetostriction. Postal address: Aalto University, School of Science and Technology, Department of Electrical Engineering, P.O.Box 13000, FI-00076 Aalto, Finland.

Antero Arkkio

Antero Arkkio was born in Vehkalahti, Finland in 1955. He received his M.Sc. (Tech.) and D.Sc. (Tech.) degrees from Helsinki University of Technology in 1980 and 1988. Currently he is a Professor of Electrical Engineering at Aalto University. His research interests deal with modeling, design, and measurement of electrical machines. Postal address: Aalto University, School of Science and Technology, Department of Electrical Engineering, P.O.Box 13000, FI-00076 Aalto, Finland.


Published Online: 2013-09-05

Published in Print: 2013-08-01


Citation Information: Electrical, Control and Communication Engineering, ISSN (Online) 2255-9159, ISSN (Print) 2255-9140, DOI: https://doi.org/10.2478/ecce-2013-0012.

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