Boström, Patrik

Duraij, Martijn

Iversen, Niels Elkjær

Petersen, Lars Press

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

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Self-Oscillating 150 W Switch-Mode Amplifier Equipped with eGaN-FETs - DTU Orbit(08/11/2017) Self-Oscillating 150 W Switch-Mode Amplifier Equipped with eGaN-FETsThis paper discusses the effect of flux modulation in the electrodynamic loudspeaker with main focus on the effect on theforce factor. A measurement setup to measure the AC flux modulation with static voice coil is explained and themeasurements 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 coppercap shows a decrease in flux modulation amplitude at the expense of increased power losses. Finally, simulations showthat there is a high dependency between the generated AC flux modulation from the voice coil and the AC force factorchange. General informationState: PublishedOrganisations: Department of Electrical Engineering, Electronics, Bolecano Holding ABAuthors: Duraij, M. (Ekstern), Iversen, N. E. (Intern), Petersen, L. P. (Intern), Boström, P. (Ekstern)Number of pages: 10Publication date: 2015 Host publication informationTitle of host publication: Proceedings of 139th International Audio Engineering Society (AES) ConventionPublisher: Audio Engineering SocietyArticle number: 9378BFI conference series: AES convention (5010926)Main Research Area: Technical/natural sciencesConference: 139th International Audio Engineering Society (AES) Convention, New York City, United States, 29/10/2015 -29/10/2015Links: http://www.aes.org/elib/ browse.cfm?elib=17936 Publication: Research - peer-review › Article in proceedings – Annual report year: 2015 

Self-Oscillating 150 W Switch-Mode Amplifier Equipped with eGaN-FETs

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Self-Oscillating 150 W Switch-Mode Amplifier Equipped with eGaN-FETs

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