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Practical model of the axial magnetic field in the end region of large turbo-generators

Practical model of the axial magnetic field in the end region of large turbo-generators PurposeThe axial magnetic field occurs in the end-region of large turbo-generators is known to induce hot points or voltages between laminations, that may cause insulation breakdown and thus stator faults.Design/methodology/approachIt is important to dispose of simple methods for estimating the axial flux rapidly with regard to the operating point of the machine.FindingsThe authors provide a practical model of the axial magnetic field based on a simplified vector diagram. The parameters required to build the vector composition of the flux densities are assessed with a limited number of finite element method simulations of the whole end-region of the machine. These simulations were validated by an experimental test on a real turbo-generator. Then the axial flux density was simply estimated for various operating points.Originality/valueThe originality of the paper concerns the practical model of the axial magnetic field based on a simplified vector diagram. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png COMPEL: Theinternational Journal for Computation and Mathematics in Electrical and Electronic Engineering Emerald Publishing

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Publisher
Emerald Publishing
Copyright
Copyright © Emerald Group Publishing Limited
ISSN
0332-1649
DOI
10.1108/COMPEL-10-2018-0435
Publisher site
See Article on Publisher Site

Abstract

PurposeThe axial magnetic field occurs in the end-region of large turbo-generators is known to induce hot points or voltages between laminations, that may cause insulation breakdown and thus stator faults.Design/methodology/approachIt is important to dispose of simple methods for estimating the axial flux rapidly with regard to the operating point of the machine.FindingsThe authors provide a practical model of the axial magnetic field based on a simplified vector diagram. The parameters required to build the vector composition of the flux densities are assessed with a limited number of finite element method simulations of the whole end-region of the machine. These simulations were validated by an experimental test on a real turbo-generator. Then the axial flux density was simply estimated for various operating points.Originality/valueThe originality of the paper concerns the practical model of the axial magnetic field based on a simplified vector diagram.

Journal

COMPEL: Theinternational Journal for Computation and Mathematics in Electrical and Electronic EngineeringEmerald Publishing

Published: Jul 1, 2019

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