Effect of end windings on the shaft voltage of a high power alternator using FE analysis

Issue title: 25th Symposium on Electromagnetic Phenomena in Nonlinear Circuits – EPNC 2018

Guest editors: Jean-Philippe Lecointe, Ewa Napieralska and Andrzej Demenko

Article type: Research Article

Authors: Darques, Kévin^{a; b;} | Tounzi, Abdelmounaïm^a | Le Menach, Yvonnick^a | Korecki, Julien^a | Beddek, Karim^b

Affiliations: [a] Laboratoire d’Electrotechnique et d’Electronique de Puissance, Université Lille, Lille, France | [b] EDF, R&D Direction, Palaiseau, France

Correspondence: [*] Corresponding author: Kévin Darques, Université Lille, Centrale Lille, Arts et Métiers ParisTech, HEI, EA 2697 - L2EP - Laboratoire d’Electrotechnique et d’Electronique de Puissance, Lille, France; EDF, R&D Direction, Palaiseau, France. E-mail: [email protected]

Abstract: Shaft voltage is present in all electrical machines and can be useful as a diagnosis variable once the effect of some defects on this quantity is well quantified. 2D numerical models have already been used to tackle this point but 3D effects due to end windings can also have a significant influence on this voltage. This paper deals with the study of a turbo-generator using a 3D finite element model in order to investigate this task. In this aim, two finite element models in 2D and 3D of a high power turbo-generator are performed. The effect of three common defects on the shaft voltage is investigated while taking into account the nonlinear behaviour of ferromagnetic materials and the armature winding of the stator. Results with both models are analyzed and compared.

Keywords: Fault diagnosis, finite element method, electromagnetism, shaft voltage, synchronous generator

DOI: 10.3233/JAE-209202

Journal: International Journal of Applied Electromagnetics and Mechanics, vol. 63, no. 4, pp. 661-671, 2020