Magnetodynamic vector hysteresis models for steel laminations of rotating electrical machines

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dc.contributor Aalto-yliopisto fi
dc.contributor Aalto University en
dc.contributor.author Dlala, Emad Ali
dc.date.accessioned 2012-02-24T09:07:00Z
dc.date.available 2012-02-24T09:07:00Z
dc.date.issued 2008-04-11
dc.identifier.isbn 978-951-22-9277-6
dc.identifier.issn 1795-4584
dc.identifier.uri https://aaltodoc.aalto.fi/handle/123456789/3011
dc.description.abstract This thesis focuses on the modeling and prediction of iron losses in rotating electrical machines. The aim is to develop core loss models that are reasonably accurate and efficient for the numerical electromagnetic field analysis. The iron loss components, including hysteresis, classical eddy-current, and excess losses, are determined by modeling the dynamic hysteresis loops, whereby the incorporation of the core losses into the field solution is feasible and thus the influence of the core losses on the performance of the machine is investigated. The thesis presents a magnetodynamic vector hysteresis model that produces not only an accurate, overall prediction of the iron losses, but also explicitly models the magnetization behavior and the loop shapes. The model is found to be efficient, stable, and adequate for providing accurate predictions of the magnetization curves, and hence iron losses, under alternating and rotating flux excitations. It is demonstrated that the model satisfies the rotational loss property and reproduces the shapes of the experimental loops. In addition, a more simplified, efficient, and robust version of the magnetodynamic vector hysteresis model is introduced. The thesis also aims to analyze the convergence of the fixed-point method, examine the barriers behind the slow convergence, and show how to overcome them. The analysis has proved useful and provided sound techniques for speeding up the convergence of the fixed-point method. The magnetodynamic lamination models have been integrated into a two-dimensional finite-element analysis of rotating electrical machines. The core losses of two induction motors have been analyzed and the impact of core losses on the motor characteristics has been investigated. The simulations conducted reveal that the models are relatively efficient, accurate, and suitable for the design purposes of electrical machines. en
dc.format.extent 95, [app]
dc.format.mimetype application/pdf
dc.language.iso en en
dc.publisher Helsinki University of Technology en
dc.publisher Teknillinen korkeakoulu fi
dc.relation.ispartofseries TKK dissertations en
dc.relation.ispartofseries 111 en
dc.relation.haspart Dlala, E., Saitz, J., Arkkio, A., Hysteresis modeling based on symmetric minor loops, IEEE Transactions on Magnetics, Vol. 41 (8): 2343-2348, August 2005. [article1.pdf] © 2005 IEEE. By permission.
dc.relation.haspart Dlala, E., Saitz, J., Arkkio, A., Inverted and forward Preisach models for numerical analysis of electromagnetic field problems, IEEE Transactions on Magnetics, Vol. 42 (8): 1963-1973, August 2006. [article2.pdf] © 2006 IEEE. By permission.
dc.relation.haspart Dlala, E., Arkkio, A., Measurement and analysis of hysteresis torque in a high-speed induction machine, IET Electric Power Applications, Vol. 1 (5): 737-742, September 2007. [article3.pdf] © 2007 The Institution of Engineering and Technology (IET). By permission.
dc.relation.haspart Dlala, E., Belahcen, A., Arkkio, A., Magnetodynamic vector hysteresis model of ferromagnetic steel laminations, Physica B, Vol. 403 (2-3): 428-432, February 2008. [article4.pdf] © 2008 Elsevier Science. By permission.
dc.relation.haspart Dlala, E., Belahcen, A., Arkkio, A., Efficient magnetodynamic lamination model for two-dimensional field simulation of rotating electrical machines, Journal of Magnetism and Magnetic Materials, to be published, in press, January 2008. [article5.pdf] © 2008 Elsevier Science. By permission.
dc.relation.haspart Dlala, E., Belahcen, A., Arkkio, A., Locally convergent fixed-point method for solving time-stepping nonlinear field problems, IEEE Transactions on Magnetics, Vol. 43 (11): 3969-3975, November 2007. [article6.pdf] © 2007 IEEE. By permission.
dc.relation.haspart Dlala, E., Belahcen, A., Arkkio, A., A fast fixed-point method for solving magnetic field problems in media of hysteresis, IEEE Transactions on Magnetics, to be published, in press, January 2008. [article7.pdf] © 2008 IEEE. By permission.
dc.relation.haspart Dlala, E., Arkkio, A., Analysis of the convergence of the fixed-point method used for solving nonlinear rotational magnetic field problems, IEEE Transactions on Magnetics, to be published, in press, January 2008. [article8.pdf] © 2008 IEEE. By permission.
dc.subject.other Electrical engineering en
dc.title Magnetodynamic vector hysteresis models for steel laminations of rotating electrical machines en
dc.type G5 Artikkeliväitöskirja fi
dc.description.version reviewed en
dc.contributor.school Faculty of Electronics, Communications and Automation en
dc.contributor.school Elektroniikan, tietoliikenteen ja automaation tiedekunta fi
dc.contributor.department Department of Electrical Engineering en
dc.contributor.department Sähkötekniikan laitos fi
dc.subject.keyword iron loss en
dc.subject.keyword vector hysteresis en
dc.subject.keyword ferromagnetic en
dc.subject.keyword magnetodynamic en
dc.subject.keyword eddy currents en
dc.subject.keyword electrical steel en
dc.subject.keyword finite element en
dc.subject.keyword rotating electrical machines en
dc.identifier.urn urn:nbn:fi:tkk-011392
dc.type.dcmitype text en
dc.type.ontasot Väitöskirja (artikkeli) fi
dc.type.ontasot Doctoral dissertation (article-based) en


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