Finite Element Modeling of Eddy Currents in Uninsulated Laminated-Steel Stacks

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dc.contributor Aalto-yliopisto fi
dc.contributor Aalto University en
dc.contributor.advisor Belahcen, Anouar
dc.contributor.advisor Rasilo, Paavo Velasco Alvarado, Jonathan 2013-07-11T12:16:04Z 2013-07-11T12:16:04Z 2013-05-20
dc.description.abstract This thesis deals with the modeling of eddy currents in uninsulated laminations. A numerical model for the calculation of eddy current losses was implemented using finite element analysis. This model calculates the solution from the electric vector potential also known as the T-𝛺 formulation for the study of eddy current problems. The numerical model was verified by comparing the harmonic solution to different analytical models. Moreover, the results were obtained for non-linear material, i.e. electrical steel. During the manufacturing process the laminations are stacked and the uneven contact between laminations makes it impossible to assume uniformity in conductivity between adjacent laminations. Electrical conductivity degradation and surface roughness in laminated-steel increases the average iron losses. Whenever the values of inter-laminar conductivity tend to zero, the eddy current component in the direction perpendicular to the lamination vanishes. For this reason, the eddy currents will loop only within the thickness of the lamination and the losses will decrease dramatically for a certain frequency range. Assuming a linear permeability (low and high) in the inter-laminar region, and widths between 6𝜇m and 10𝜇m, causes negligible changes in the calculation of the losses for which is recommended to use wider inter-laminar areas and high permeability, as it enhances the convergence of the model. A model dealing with insulated laminated-stacks was implemented for comparison purposes. Uninsulated laminations could be used as an economical alternative for certain applications where laminated cores are used, as in the case of rotational electrical machines and transformers. en
dc.format.extent 76+7
dc.format.mimetype application/pdf en
dc.language.iso en en
dc.title Finite Element Modeling of Eddy Currents in Uninsulated Laminated-Steel Stacks en
dc.type G2 Pro gradu, diplomityö en Sähkötekniikan korkeakoulu fi
dc.contributor.department Department of Electrical Engineering en
dc.subject.keyword Computational Electromagnetics en
dc.subject.keyword Finite Element Analysis en
dc.subject.keyword Electrical Machines en
dc.subject.keyword Iron Losses en
dc.subject.keyword Eddy Currents en
dc.subject.keyword Steel Laminations en
dc.identifier.urn URN:NBN:fi:aalto-201307127191
dc.programme.major Electromechanics en
dc.programme.mcode S-17 fi
dc.type.ontasot Diplomityö fi
dc.type.ontasot Master's thesis en
dc.contributor.supervisor Arkkio, Antero
dc.programme EST - Master’s Programme in Electrical Engineering fi
dc.location P1 fi

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