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PreprintarXiv licencearXiv

Coils in thermomagnetic harvesters -- a comparative study

  • Aske Chris Nilsson
  • Andrea Roberto Insinga
  • Salvatore De Angelis
  • Georgios Potsios
  • Rasmus Bjørk
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Abstract

Thermomagnetic generators (TMGs) are devices that convert waste heat to electricity through a change in magnetization of a solid material. This causes a changing flux through a coil, which induces an electromotive force per Faraday's law. However, the influence of the coil on the performance of the TMG has not been investigated and existing TMG prototypes merely utilize some coil, not the optimal coil for a given device. In this work we present an analytical and numerical model of a TMG that calculates power by explicitly coupling the TMGs magnetic and electric circuits and use this to analyze the influence of the coil on the TMG performance. We show that TMG power has a linear dependence on coil volume, independent of the specific combination of wire radius and coil turns. The model is validated with experimental data, and finally used to study prototype TMGs presented in literature, where we show that the power of these literature TMGs can be increased by a factor of 10-400 times, had larger coils been used in the prototypes.

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Cite

BibTeXRIS
BibTeX
@misc{nilsson2026coils,
  title = {{Coils in thermomagnetic harvesters -- a comparative study}},
  author = {Aske Chris Nilsson and Andrea Roberto Insinga and Salvatore De Angelis and Georgios Potsios and Rasmus Bjørk},
  howpublished = {arXiv},
  year = {2026},
  month = oct,
  doi = {10.48550/arxiv.2606.11229},
  eprint = {2606.11229},
  archivePrefix = {arXiv},
  url = {https://arxiv.org/abs/2606.11229},
}
RIS
TY  - UNPB
TI  - Coils in thermomagnetic harvesters -- a comparative study
AU  - Aske Chris Nilsson
AU  - Andrea Roberto Insinga
AU  - Salvatore De Angelis
AU  - Georgios Potsios
AU  - Rasmus Bjørk
PY  - 2026
DA  - 2026/10/02
PB  - arXiv
DO  - 10.48550/arxiv.2606.11229
UR  - https://arxiv.org/abs/2606.11229
AB  - Thermomagnetic generators (TMGs) are devices that convert waste heat to electricity through a change in magnetization of a solid material. This causes a changing flux through a coil, which induces an electromotive force per Faraday's law. However, the influence of the coil on the performance of the TMG has not been investigated and existing TMG prototypes merely utilize some coil, not the optimal coil for a given device. In this work we present an analytical and numerical model of a TMG that calculates power by explicitly coupling the TMGs magnetic and electric circuits and use this to analyze the influence of the coil on the TMG performance. We show that TMG power has a linear dependence on coil volume, independent of the specific combination of wire radius and coil turns. The model is validated with experimental data, and finally used to study prototype TMGs presented in literature, where we show that the power of these literature TMGs can be increased by a factor of 10-400 times, had larger coils been used in the prototypes.
ER  -