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A Quasi-Static Electromagnetic Analysis for Experiments with Strong Permanent Magnets
Linnaeus University, Faculty of Technology, Department of Physics and Electrical Engineering.ORCID iD: 0000-0002-7018-6248
Linnaeus University, Faculty of Technology, Department of Physics and Electrical Engineering.ORCID iD: 0000-0003-2659-4161
2014 (English)In: Progress in Electromagnetics Research B, ISSN 1937-6472, Vol. 61, 1-16 p.Article in journal (Refereed) Published
Abstract [en]

An electromagnetic analysis is presented for experiments with strong permanent disc magnets. The analysis is based on the well known experiment that demonstrates the effect of circulating eddy currents by dropping a strong magnet through a vertically placed metal cylinder and observing how the magnet is slowly falling through the cylinder with a constant velocity. This experiment is quite spectacular with a super strong neodymium magnet and a thick metal cylinder made of copper or aluminum. A rigorous theory for this experiment is provided based on the quasi-static approximation of the Maxwell equations, an infinitely long cylinder (no edge effects) and a homogeneous magnetization of the disc magnet. The results are useful for teachers and students in electromagnetics who wish to obtain a deeper insight into the analysis and experiments regarding this phenomenon, or with industrial applications such as the grading and calibration of strong permanent magnets or with measurements of the conductivity of various metals, etc.. Several experiments and numerical computations are included to validate and to illustrate the theory.

Place, publisher, year, edition, pages
2014. Vol. 61, 1-16 p.
National Category
Engineering and Technology
Research subject
Physics, Waves and Signals
Identifiers
URN: urn:nbn:se:lnu:diva-41824DOI: 10.2528/PIERB14070903OAI: oai:DiVA.org:lnu-41824DiVA: diva2:800848
Available from: 2015-04-08 Created: 2015-04-08 Last updated: 2017-01-10Bibliographically approved

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Nordebo, SvenGustafsson, Alexander
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CiteExportLink to record
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Citation style
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