Temperature stability of Neodymium magnets in voice coil transducers

Jacques R, Bardt C, Faulhaber M, Mick KJ. Temperature stability of Neodymium magnets in voice coil transducers. In: AES Conference: 2020 AES International Conference on Audio for Virtual and Augmented Reality (August 2020). Audio Engineering Society; 2020. Paper 10460. Available from: https://aes.org/publications/elibrary-page/?id=21137

@inproceedings{Jacques2020_21137,
  author = {Jacques, Roland and Bardt, Claudia and Faulhaber, Meike and Mick, Kurt Jürgen},
  title = {{Temperature stability of Neodymium magnets in voice coil transducers}},
  booktitle = {AES Conference: 2020 AES International Conference on Audio for Virtual and Augmented Reality (August 2020)},
  note = {Paper 10460},
  year = {2020},
  month = aug,
  publisher = {Audio Engineering Society},
  url = {https://aes.org/publications/elibrary-page/?id=21137}
}

TY  - CPAPER
TI  - Temperature stability of Neodymium magnets in voice coil transducers
AU  - Jacques, Roland
AU  - Bardt, Claudia
AU  - Faulhaber, Meike
AU  - Mick, Kurt Jürgen
T2  - AES Conference: 2020 AES International Conference on Audio for Virtual and Augmented Reality (August 2020)
M1  - Paper 10460
PY  - 2020
DA  - 2020/08/06
UR  - https://aes.org/publications/elibrary-page/?id=21137
PB  - Audio Engineering Society
LA  - en
AB  - Sintered neodymium magnets enjoy continued popularity in electro-acoustic transducers due to their high energy density, which enables the design of lightweight and efficient products. Various, quasi-standardized grades are available which differ in remanence, coercivity, and temperature stability. The latter is depicted in a series of B-H curves in the material datasheet; correctly interpreting them requires a detailed calculation of the complete magnetic circuit. In typical voice coil magnet systems, the presence of the magnetic circuit has quite a favorable effect, preventing thermal demagnetization in a certain temperature range above the nominal temperature limit. Methods and experimental data regarding this question are presented in this paper. Furthermore, the progression of thermal demagnetization over time is researched and presented, and shows interesting characteristics which can be quite relevant in practice, both for cost efficiency and for environmental impact.
ER  -