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Thermomagnetic motors are solid-state energy harvesters able to convert low-grade heat wastes into mechanical energy. The objective of this work is to present the key design parameters for successful thermomagnetic motor prototypes with different concepts: alternative and rotary. It includes the relation between the magnetic field source and heat transfer properties related to the magnetic heat exchanger towards the increasing of the produced power and operating frequency. Results showed that the alternative apparatus was able to operate at 1.25 Hz and produce powers of ~4.26 W (78.9 W/kg or 623.2 mW/cm3), using Gd spheres with 500 µm; while the rotary motor presented maximum velocities around 350 RPM and achieved maximum torques and powers of ~1.2 Nm and ~4.7 W (39.2 W/kg or 309.4 mW/cm3), respectively, using Gd plates with 0.9 mm thick. Both systems operated at 5oC and 35-50oC as heat sink and source temperatures. Considering the state-of-the-art, these results are among the highest values reported in the literature for thermomagnetic motors.

Development and experimental testing of thermomagnetic motors.

Number: 0007

Author(s) : TREVIZOLI P. V., MICHEL H. C. C., SILVA C. E. L., CHAVES P. A. D., TADIM M. S., PIRES A. F. G., BASTOS M. P. C., TORRES D. L. B., ROCHA T. T. M., CÂMARA M. A., BRAGA C. M. P.

Summary

The conference is organised by the University of Ljubljana in collaboration with the International Institute of Refrigeration, the Slovenian Energy Association, and the Chinese Association of Refrigeration. It cover a wide range of solid-state disciplines and aims to promote technology transfer across these fields. The conference will focus on materials and their device applications, including cryogenics, refrigeration, heat pumping, energy harvesting, thermal management, thermal storage, and sensorics.
With 30 papers, the main topics of the conference will be divided into different sessions, as follows: Magnetocalorics or thermomagnetics, Electrocalorics and pyroelectrics, Mechanocalorics and thermomechanics, Multicalorics and multi-pyro, Thermoelectrics and magneto-thermoelectrics, Solid-state thermal storage, Solid-state laser cooling, Spincaloritronics, Thermal control devices and Other solid-state materials and related technologies.

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Pages: 11 p.

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Details

  • Original title: Development and experimental testing of thermomagnetic motors.
  • Record ID : 30035049
  • Languages: English
  • Subject: Technology
  • Source: 11th IIR Conference on Solid-State Cooling, Heating and Energy Harvesting.
  • Publication date: 2026/06/07
  • DOI: http://dx.doi.org/10.18462/iir.thermag.2026.0007

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