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A Theoretical Analysis of Eddy-Current Effects in Loudspeaker Motors

A linear theoretical model of the electromagnetic field associated with a short-coil, long-magnet loudspeaker is developed. Results show that the resistance of the voice coil is reduced and its inductance increased by replacing the steel near the voice coil with a polymer-based magnetic powder composite. This eliminates eddy currents near the coil and is suggested as a mechanism by which the third-harmonic electromotive field in the coil is reduced. Calculated values of impedance agree well with experimental data.

Authors: Bowler, John R.; Harfield, Nicola; Merricks, Nick P.; Woodman, William J.
Affiliations: Department of Physics, School of Physical Sciences, University of Surrey, Guildford, Surrey, UK ; ATC Loudspeaker Technology Ltd., Stroud, Gloucestershire, UK(See document for exact affiliation information.)
JAES Volume 48 Issue 7/8 pp. 668-678; July 2000 Import into BibTeX

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