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This paper presents a way of modeling the effect of eddy currents on the inductance of a loudspeaker coil over a wide frequency bandwidth without the use of fractional derivatives or Foster/Cauer networks. The model presented is a physics-based model, which is derived from Maxwell’s equations and discretized in space. The model is compared with finite element analysis simulations and measurement data. The results show an excellent agreement with the reference data over the audio bandwidth and for different coil positions. Using eight parameters, of which four require fitting and only two are dependent on the coil position, the model is simple to fit to reference data and may be vectorized for real-time applications.
Author (s): Munroe, Oliver; Novak, Antonin; Simon, Laurent; Massicotte, Daniel
Affiliation:
Laboratoire d’Acoustique de l’Université du Mans (LAUM), UMR 6613, Institut d’Acoustique - Graduate School (IA-GS), CNRS, Le Mans Université, France; Laboratory of Signal and System Integration, Department of Electrical and Computer Engineering, University of Québec, Trois-Rivières, QC G9A 5H7 Canada; Laboratory of Signal and System Integration, Department of Electrical and Computer Engineering, University of Québec, Trois-Rivières, QC G9A 5H7 Canada; Laboratoire d’Acoustique de l’Université du Mans (LAUM), UMR 6613, Institut d’Acoustique Graduate School (IA-GS), CNRS, Le Mans Université, Le Mans, France
(See document for exact affiliation information.)
Publication Date:
2025-01-07
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Munroe, Oliver; Novak, Antonin; Simon, Laurent; Massicotte, Daniel; 2025; Modeling the Effect of Eddy Currents on the Inductance of Loudspeaker Motors Using the Method of Lines [PDF]; Laboratoire d’Acoustique de l’Université du Mans (LAUM), UMR 6613, Institut d’Acoustique - Graduate School (IA-GS), CNRS, Le Mans Université, France; Laboratory of Signal and System Integration, Department of Electrical and Computer Engineering, University of Québec, Trois-Rivières, QC G9A 5H7 Canada; Laboratory of Signal and System Integration, Department of Electrical and Computer Engineering, University of Québec, Trois-Rivières, QC G9A 5H7 Canada; Laboratoire d’Acoustique de l’Université du Mans (LAUM), UMR 6613, Institut d’Acoustique Graduate School (IA-GS), CNRS, Le Mans Université, Le Mans, France; Paper ; Available from: https://aes2.org/publications/elibrary-page/?id=22794
Munroe, Oliver; Novak, Antonin; Simon, Laurent; Massicotte, Daniel; Modeling the Effect of Eddy Currents on the Inductance of Loudspeaker Motors Using the Method of Lines [PDF]; Laboratoire d’Acoustique de l’Université du Mans (LAUM), UMR 6613, Institut d’Acoustique - Graduate School (IA-GS), CNRS, Le Mans Université, France; Laboratory of Signal and System Integration, Department of Electrical and Computer Engineering, University of Québec, Trois-Rivières, QC G9A 5H7 Canada; Laboratory of Signal and System Integration, Department of Electrical and Computer Engineering, University of Québec, Trois-Rivières, QC G9A 5H7 Canada; Laboratoire d’Acoustique de l’Université du Mans (LAUM), UMR 6613, Institut d’Acoustique Graduate School (IA-GS), CNRS, Le Mans Université, Le Mans, France; Paper ; 2025 Available: https://aes2.org/publications/elibrary-page/?id=22794
@article{munroe2025modeling,
author={munroe oliver and novak antonin and simon laurent and massicotte daniel},
journal={journal of the audio engineering society},
title={modeling the effect of eddy currents on the inductance of loudspeaker motors using the method of lines},
year={2025},
volume={73},
issue={1/2},
pages={63-74},
month={february},}
TY – paper
TI – Modeling the Effect of Eddy Currents on the Inductance of Loudspeaker Motors Using the Method of Lines
SP – 63 EP – 74
AU – Munroe, Oliver
AU – Novak, Antonin
AU – Simon, Laurent
AU – Massicotte, Daniel
PY – 2025
JO – Journal of the Audio Engineering Society
VO – 73
IS – 1/2
Y1 – February 2025