Design and assembly of a magnetic circuit with four magnetic field regions applied to a thermomagnetic motor prototype
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Universidade Federal de Minas Gerais
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Thermomagnetic motors (TMM) are devices employed to convert low-grade thermal energy waste into mechanical energy. The generation of torque and power in a TMM relies on the variation of the magnetic phase, occurring around the Curie temperature (T Curie), of a magnetic material and its interaction with an external magnetic field. This work presents the design, fabrication and assembly of a permanent magnet magnetic circuit (MC) which is part of a rotary TMM. The MC incorporates four high magnetic field regions to maximize power output. The design process involved 3D simulations in COMSOL Multiphysics, Module AC/DC, to evaluate the intensity and distribution of the magnetic field. Parameters such as the magnetic gap height and the utilization of soft magnetic materials were thoroughly investigated to enhance the magnetic field intensity and achieve greater homogeneity within the magnetic volume. The final design of the MC comprises commercially available blocks of NdFeB grade N42, arranged in a Halbach array configuration, along with ABNT 1020 steel components to enclose the magnetic circuit. During the production phase, conventional machining operations were employed, utilizing the Machine Center, to ensure the precise assembly of the MC components with minimal deviations. The quality of the production and final assembly was assessed through experimental measurements of the generated magnetic field, which were subsequently compared with the simulation results.
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thermomagnetic motors, magnetic circuit, desing, production, machine center
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https://streamlab.demec.ufmg.br/wp-content/uploads/2024/07/COBEM-2023-Torres-et-al.pdf