Materials Chemistry; Electrical and Electronic Engineering; Metals and Alloys; Condensed Matter Physics; Ceramics and Composites; Bulk superconductor; Trapped field magnet; Magnetic field gradient; Interacting bulk superconductors; Flux pinning
Résumé :
[en] Abstract
In applications requiring a large magnetic force, permanent magnets with non-parallel magnetization directions can be assembled in a Halbach array to generate a large gradient of magnetic flux density. The saturation magnetization of permanent magnets, however, brings a fundamental limit on the performance of this configuration. In the present work, we investigate experimentally the assembly of cuboid bulk, large grain melt-textured YBa2Cu3O7−x superconductors (∼14×14×14 mm3) with orthogonal c-axes so as to form a basic unit of Halbach array. The experiments are carried out at 77 K. The experimental distribution of the magnetic flux density above the array of trapped-field superconductors is compared to a similar array made of permanent magnets. A simple analytical model is developed and is shown to accurately reproduce the main experimental observations. The results suggest that a redistribution occurs in the current flowing in the central sample when the distance between the superconductors is reduced, whereas the neighbouring superconductors are unaffected. It is shown that this current redistribution yields a reduced contribution of the central sample to the magnetic flux density above the centre of the array and a new negative contribution associated with stray fields to the magnetic flux density at this location. This interpretation is confirmed by modelling of the distribution of transport currents in the superconductor using a 3D finite element model.
Disciplines :
Ingénierie, informatique & technologie: Multidisciplinaire, généralités & autres
Auteur, co-auteur :
Houbart, Michel ; Université de Liège - ULiège > Montefiore Institute of Electrical Engineering and Computer Science
Fagnard, Jean-François ; Université de Liège - ULiège > Montefiore Institute of Electrical Engineering and Computer Science
Dular, Julien ; Université de Liège - ULiège > Montefiore Institute of Electrical Engineering and Computer Science
Dennis, Anthony
Namburi, Devendra Kumar
Durrell, John Hay
Geuzaine, Christophe ; Université de Liège - ULiège > Montefiore Institute of Electrical Engineering and Computer Science
Vanderheyden, Benoît ; Université de Liège - ULiège > Montefiore Institute of Electrical Engineering and Computer Science
Vanderbemden, Philippe ; Université de Liège - ULiège > Montefiore Institute of Electrical Engineering and Computer Science
Langue du document :
Anglais
Titre :
Trapped magnetic field distribution above a superconducting linear Halbach array
Titre traduit :
[fr] Distribution du champ piégé au dessus d'un array de Halbach supraconducteur
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