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Dynamical electromechanical model of magnetic bearings subject to eddy currents

Eddy currents forces may play a significant role in magnetic bearings. They generate losses and induce forces, which may lead to a malfunction of the magnetic bearing. But eddy currents in magnetic bearings may also be used positively, to generate desired forces, like in electrodynamic bearings.

This thesis proposes a phenomenological electromechanical model aimed to explain the physical consequences of the forces due to eddy currents in any type of rotating magnetic bearing. The developed model is able to predict, analyze or simulate the dynamical behavior of these magnetic bearings, or of more complex systems integrating these bearings.

The model integrates the mechanical aspects linked to the rotor dynamics and the electrical aspects linked to the electromagnetic nature of the forces. By a rigorous approach, the electromagnetic forces are modeled by equivalent mechanical components, like springs and dampers. The impact of resistive and inductive effects of the conductors where the eddy currents take place are considered. The presence of the skin effect in the conductors is taken into account via phenomenological models presented in the work.

It is explained how the parameters characterizing the proposed model can be identified on the basis of simple quasi-static finite elements simulations or experiments. This identification is applied to different study cases and shows that the forces predicted by the model fit well with those obtained from finite element simulations.

Finally, the model is useful to better understand the influence of the model parameters and physical parameters on the bearing stability and on the stiffness induced by the eddy current forces. It also provides some guidelines for the design of magnetic bearings. This work shows the model ability to simulate the dynamical behavior of more complex systems such as a magnetic bearing with damping between the stator and the fixed frame.


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Spécifications


Éditeur
Presses universitaires de Louvain
Partie du titre
Numéro 340
Auteur
Virginie Kluyskens,
Collection
Thèses de l'École polytechnique de Louvain
Langue
anglais
Catégorie (éditeur)
Sciences appliquées > Electricité
Catégorie (éditeur)
Sciences appliquées
BISAC Subject Heading
TEC000000 TECHNOLOGY & ENGINEERING
Code publique Onix
06 Professional and scholarly
CLIL (Version 2013 )
3069 TECHNIQUES ET SCIENCES APPLIQUEES
Description public visé
Électromécaniciens
Date de première publication du titre
20 novembre 2011
Subject Scheme Identifier Code
Thema subject category: T
Type d'ouvrage
Thèse
Avec
Bibliographie

Livre broché


Details de produit
1 Couverture pelliculée
Date de publication
20 octobre 2011
ISBN-13
978-2-87558-018-4
Ampleur
Nombre de pages de contenu principal : 252
Dépôt Légal
D/2011/9964/38
Code interne
85635
Format
16 x 24 x 1,4 cm
Poids
411 grammes
Prix
26,00 €
ONIX XML
Version 2.1, Version 3

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