Permanent Magnet Levitation Stabilized by Diamagnetic Materials: A case-study

Conference: CEM 2006 - 6th International Conference on Computational Electromagnetics
04/04/2006 - 04/06/2006 at Aachen, Germany

Proceedings: CEM 2006

Pages: 2Language: englishTyp: PDF

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Emil, Cazacu (Polytechnic University of Bucharest, Electrical Engineering Department, Romania)

Earnshaw's theorem prohibits stable static levitation of permanent magnets in stationary fields with no energy input. However, by a proper placement of a diamagnetic material, the levitation is stabilized and two distinct suspension arrays (vertical and radial) are obtained. This compact implementations works without superconductors and may require no energy input. For the vertical stabilized configuration, this paper establishes the equilibrium and stability condition using an analytical procedure of magnetic field computation. An experimental model based on strong permanent magnets (NdFeB) and pyrolytic graphite validates these analytical results.