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.
Authors:
Halvorsen, Morten; Tinggaard, Carsten; Agerkvist, Finn T.
Affiliations:
PointSource Acoustics, Roskilde, Denmark; Technical University of Denmark, Kgs. Lyngby, Denmark(See document for exact affiliation information.)
AES Convention:
138 (May 2015)
Paper Number:
9317
Publication Date:
May 6, 2015
Subject:
Transducers
Click to purchase paper as a non-member or you can login as an AES member to see more options.
No AES members have commented on this paper yet.
To be notified of new comments on this paper you can subscribe to this RSS feed. Forum users should login to see additional options.
If you are not yet an AES member and have something important to say about this paper then we urge you to join the AES today and make your voice heard. You can join online today by clicking here.