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

Cristian Demian (Universite d’Artois Faculte des Sciences Appliquees, Bethune, France)
Raphael Romary (LSEE: Laboratoire Systemes Electrotechniques et Environnement, Artois University, Bethune, France)
Gilles Vogt (LSEE, Universite d’Artois, Arras, France and EDF Recherche et Developpement, Clamart, France)
Valentin Costan (EDF R and D, Palaiseau, France)

COMPEL - The international journal for computation and mathematics in electrical and electronic engineering

ISSN: 0332-1649

Article publication date: 25 June 2019

Issue publication date: 14 August 2019

Abstract

Purpose

The 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/approach

It is important to dispose of simple methods for estimating the axial flux rapidly with regard to the operating point of the machine.

Findings

The 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/value

The originality of the paper concerns the practical model of the axial magnetic field based on a simplified vector diagram.

Keywords

Citation

Demian, C., Romary, R., Vogt, G. and Costan, V. (2019), "Practical model of the axial magnetic field in the end region of large turbo-generators", COMPEL - The international journal for computation and mathematics in electrical and electronic engineering, Vol. 38 No. 4, pp. 1295-1305. https://doi.org/10.1108/COMPEL-10-2018-0435

Publisher

:

Emerald Publishing Limited

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