Magnetic levitation by induced eddy currents in non-magnetic conductors and conductivity measurements

We report a study on magnetic levitation by induced ac currents in non-magnetic conductors at low frequencies. Our discussion, based on Faraday's induction law, allows us to distinguish the two components of the current responsible for levitation and heating, respectively. The experimental eval...

Full description

Saved in:
Bibliographic Details
Published in:European journal of physics 2005-11, Vol.26 (6), p.951-957
Main Authors: Íñiguez, J, Raposo, V, Flores, A G, Zazo, M, Hernández-López, A
Format: Article
Language:English
Subjects:
Communication, education, history, and philosophy
Exact sciences and technology
General physics
Physics
Physics literature and publications
Surveys and tutorial papers, resource letters
Citations: Items that this one cites
Items that cite this one
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary:We report a study on magnetic levitation by induced ac currents in non-magnetic conductors at low frequencies. Our discussion, based on Faraday's induction law, allows us to distinguish the two components of the current responsible for levitation and heating, respectively. The experimental evaluation of the levitation force in a copper ring revealed the accuracy of our analysis, clearly illustrating its asymptotic behaviour versus frequency, and validating it for the qualitative analysis of magnetic levitation and heating in conductors of different shapes such as tubes and discs, composed of collections of conductive loops. The analysis of the results allows precise values of its electrical conductivity to be found. With the help of a simulation technique, this work also reveals the progressive deformation undergone by magnetic induction lines due to magnetic screening when frequency increases.
ISSN:0143-0807
1361-6404
DOI:10.1088/0143-0807/26/6/002