Flux Modulation in the Electrodynamic Loudspeaker

Morten Halvorsen, Carsten Tinggaard, Finn T. Agerkvist

Research output: Chapter in Book/Report/Conference proceedingArticle in proceedingsResearchpeer-review


This paper discusses the effect of flux modulation in the electrodynamic loudspeaker with main focus on the effect on the force factor. A measurement setup to measure the AC flux modulation with static voice coil is explained and the measurements shows good consistency with FEA simulations. Measurements of the generated AC flux modulation shows, that eddy currents are the main source to magnetic losses in form of phase lag and amplitude changes. Use of a copper cap shows a decrease in flux modulation amplitude at the expense of increased power losses. Finally, simulations show that there is a high dependency between the generated AC flux modulation from the voice coil and the AC force factor change.
Original languageEnglish
Title of host publicationProceedings of 138th International Audio Engineering Society (AES) Convention.
Number of pages10
PublisherAudio Engineering Society
Publication date2015
Publication statusPublished - 2015
Event138th International Audio Engineering Society (AES) Convention - Warsaw, Poland
Duration: 7 May 201510 May 2015


Conference138th International Audio Engineering Society (AES) Convention


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