Modeling the Effect of Eddy Currents on the Inductance of Loudspeaker Motors Using the Method of Lines

Munroe O, Novak A, Simon L, Massicotte D. Modeling the Effect of Eddy Currents on the Inductance of Loudspeaker Motors Using the Method of Lines. J Audio Eng Soc. 2025;73(1/2):63-74. doi:10.17743/jaes.2022.0188

@article{Munroe2025_22794,
  author = {Munroe, Oliver and Novak, Antonin and Simon, Laurent and Massicotte, Daniel},
  title = {{Modeling the Effect of Eddy Currents on the Inductance of Loudspeaker Motors Using the Method of Lines}},
  journal = {Journal of the Audio Engineering Society},
  volume = {73},
  number = {1/2},
  pages = {63--74},
  year = {2025},
  month = jan,
  publisher = {Audio Engineering Society},
  doi = {10.17743/jaes.2022.0188},
  url = {https://doi.org/10.17743/jaes.2022.0188}
}

TY  - JOUR
TI  - Modeling the Effect of Eddy Currents on the Inductance of Loudspeaker Motors Using the Method of Lines
AU  - Munroe, Oliver
AU  - Novak, Antonin
AU  - Simon, Laurent
AU  - Massicotte, Daniel
T2  - Journal of the Audio Engineering Society
J2  - J. Audio Eng. Soc.
VL  - 73
IS  - 1/2
SP  - 63
EP  - 74
PY  - 2025
DA  - 2025/01/07
DO  - 10.17743/jaes.2022.0188
UR  - https://doi.org/10.17743/jaes.2022.0188
PB  - Audio Engineering Society
LA  - en
AB  - 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.
ER  -