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M. Halvorsen, C. Tinggaard, and FI. T.. Agerkvist, "Flux Modulation in the Electrodynamic Loudspeaker," Paper 9317, (2015 May.). doi: M. Halvorsen, C. Tinggaard, and FI. T.. Agerkvist, "Flux Modulation in the Electrodynamic Loudspeaker," Paper 9317, (2015 May.). doi:
Abstract: 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 show 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.

@article{halvorsen2015flux,
author={halvorsen, morten and tinggaard, carsten and agerkvist, finn t.},
journal={journal of the audio engineering society},
title={flux modulation in the electrodynamic loudspeaker},
year={2015},
volume={},
number={},
pages={},
doi={},
month={may},} @article{halvorsen2015flux,
author={halvorsen, morten and tinggaard, carsten and agerkvist, finn t.},
journal={journal of the audio engineering society},
title={flux modulation in the electrodynamic loudspeaker},
year={2015},
volume={},
number={},
pages={},
doi={},
month={may},
abstract={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 show 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.},}

TY - paper
TI - Flux Modulation in the Electrodynamic Loudspeaker
SP - EP -
AU - Halvorsen, Morten
AU - Tinggaard, Carsten
AU - Agerkvist, Finn T.
PY - 2015
JO - Journal of the Audio Engineering Society
IS -
VO -
VL -
Y1 - May 2015 TY - paper
TI - Flux Modulation in the Electrodynamic Loudspeaker
SP - EP -
AU - Halvorsen, Morten
AU - Tinggaard, Carsten
AU - Agerkvist, Finn T.
PY - 2015
JO - Journal of the Audio Engineering Society
IS -
VO -
VL -
Y1 - May 2015
AB - 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 show 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.