Magnetic damping: Analysis of an eddy current brake using an airtrack
作者:
Louis H. Cadwell,
期刊:
American Journal of Physics
(AIP Available online 1996)
卷期:
Volume 64,
issue 7
页码: 917-923
ISSN:0002-9505
年代: 1996
DOI:10.1119/1.18122
出版商: American Association of Physics Teachers
关键词: EDDY CURRENTS;FARADAY LAWS;LORENTZ FORCE;DAMPING;MAGNETS;ELECTRIC CONDUCTORS;ALUMINIUM;MAGNETIC FIELDS;ELECTROMOTIVE FORCE;03.20;41.
数据来源: AIP
摘要:
A simple theory is proposed using Faraday’s law and the Lorentz force to analyze the effect of magnetic damping on an aluminum plate moving on a horizontal air track as it passes between the poles of a horseshoe magnet. The position, velocity, and acceleration of the nonmagnetic conducting plate are measured as a function of time using a motion detector. Using some simplifying assumptions, a theoretical model is obtained in which a single free parameter is used to fit the experimental data. This parameter corresponds to an effective length (LR) in which the eddy current encounters resistance as it moves around a closed path in the conductor. This leads to some interesting, but unexpected, results about the shape and magnitude of induced eddy currents.
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