Impact of the Coupling Factor on Lossy Voice Coil Impedance

Anazawa I. Impact of the Coupling Factor on Lossy Voice Coil Impedance. In: AES Convention 146. Audio Engineering Society; 2019.pp. 10153:1-. Available from: https://aes.org/publications/elibrary-page/?id=20286

@inproceedings{Anazawa2019_20286,
  author = {Anazawa, Isao},
  title = {{Impact of the Coupling Factor on Lossy Voice Coil Impedance}},
  booktitle = {AES Convention 146},
  pages = {10153:1-},
  year = {2019},
  month = mar,
  publisher = {Audio Engineering Society},
  url = {https://aes.org/publications/elibrary-page/?id=20286}
}

TY  - CPAPER
TI  - Impact of the Coupling Factor on Lossy Voice Coil Impedance
AU  - Anazawa, Isao
T2  - AES Convention 146
SP  - 1
M1  - Paper 10153
PY  - 2019
DA  - 2019/03/06
UR  - https://aes.org/publications/elibrary-page/?id=20286
PB  - Audio Engineering Society
LA  - en
AB  - The voice coil impedance frequency dependence due to Eddy current, skin, and proximity effects (Eddy Losses) becomes more apparent as the frequency becomes higher. The theory is that the magnitude of lossy impedance frequency dependence is vw . However in the majority of real loudspeakers, the impedance frequency dependence was empirically found to be clearly higher than this. A voice coil blocked impedance model was developed based on a structure that applies a transformer for the voice coil inductance as the primary winding. Surrounding conductive material is treated as an impedance connected to the secondary winding. The model successfully describes the blocked impedance frequency dependence that agreed at a high degree of accuracy with the actual samples. Also the model showed intricate connections between the transformer coupling coefficient k and the magnitude of frequency dependency.
ER  -