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

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© 2013 Walter de Gruyter GmbH. This is the accepted version of the following article: Shah, Sahas Bikram & Rasilo, Paavo & Belahcen, Anouar & Arkkio, Antero. 2013. Modeling of Losses Due to Inter-Laminar Short-Circuit Currents in Lamination Stacks. Electrical, Control and Communication Engineering. Volume 3, Issue 1. 31-36. ISSN 2255-9159 (printed). DOI: 10.2478/ecce-2013-0012, which has been published in final form at http://www.degruyter.com/view/j/ecce.2013.3.issue-1/ecce-2013-0012/ecce-2013-0012.xml under the terms of the Creative Commons Attribution-Non-Commercial-NoDerivs license http://creativecommons.org/licenses/by-nc-nd/3.0/.
Journal Title
Journal ISSN
Volume Title
School of Electrical Engineering | A1 Alkuperäisartikkeli tieteellisessä aikakauslehdessä
Date
2013
Major/Subject
Mcode
Degree programme
Language
en
Pages
31-36
Series
Electrical, Control and Communication Engineering, Volume 3, Issue 1
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.
Description
Keywords
Air gaps, Eddy currents, finite element analysis
Other note
Citation
Shah, Sahas Bikram & Rasilo, Paavo & Belahcen, Anouar & Arkkio, Antero. 2013. Modeling of Losses Due to Inter-Laminar Short-Circuit Currents in Lamination Stacks. Electrical, Control and Communication Engineering. Volume 3, Issue 1. 31-36. 2255-9159 (printed). DOI: 10.2478/ecce-2013-0012.