Thermo-magnetic motor

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Thermo-magnetic motors convert heat into mechanical work using the thermomagnetic effect, i.e., the influence of temperature on the magnetic material magnetization.[1] This technology dates back to 19th century, when a number of scientist submitted patents on the so called “pyro-magnetic generators”.[2] These systems operate in a magnetic Brayton cycle, in a reverse sense of the magnetocaloric refrigerators.[3] Experiments have only produced extremely inefficient working prototypes,[4][5][6] however thermodynamic analysis indicate that thermomagnetic motors present high efficiency related to Carnot efficiency for small temperature differences around the magnetic material Curie temperature.[3][7] The thermo-magnetic motor principle has been studied as a possible actuator in smart materials.[8]

See also[edit]


  1. ^ Gama, Sergio; Ferreira, Lucas D. R.; Bessa, Carlos V. X.; Horikawa, Oswaldo; Coelho, Adelino A.; Gandra, Flavio C.; Araujo, Raul; Egolf, Peter W. (2016). "Analytic and Experimental Analysis of Magnetic Force Equations". IEEE Transactions on Magnetics. 52 (7): 1–4. doi:10.1109/tmag.2016.2517127.
  2. ^ Ferreira, L; Bessa, C; Silva, I; Gama, S (2013). Green Design, Materials and Manufacturing Processes. pp. 107–111. doi:10.1201/b15002-23. ISBN 978-1-138-00046-9.
  3. ^ a b Bessa, C. V. X.; Ferreira, L. D. R.; Horikawa, O.; Monteiro, J. C. B.; Gandra, F. G.; Gama, S. (2017). "On the influence of thermal hysteresis on the performance of thermomagnetic motors". Journal of Applied Physics. 122 (24): 244502. doi:10.1063/1.5010356.
  4. ^ Martin, Thomas Commerford; Wetzler, Joseph (1891). The electric motor and its applications. New York: W. J. Johnston. pp. 272–278.
  5. ^ Murakami, K.; Nemoto, M. (1972). "Some experiments and considerations on the behavior of thermomagnetic motors". IEEE Transactions on Magnetics. 8 (3): 387–389. doi:10.1109/tmag.1972.1067406.
  6. ^ Andreevskii, K. N.; Mandzhavidze, A. G.; Margvelashvili, I. G.; Sobolevskaya, S. V. (1998-09-01). "Investigation of the thermodynamic and physical characteristics of a thermomagnetic engine with a gadolinium working element". Technical Physics. 43 (9): 1115–1118. doi:10.1134/1.1259144. ISSN 1063-7842.
  7. ^ Egolf, Peter W.; Kitanovski, Andrej; Diebold, Marc; Gonin, Cyrill; Vuarnoz, Didier (2009). "Magnetic power conversion with machines containing full or porous wheel heat exchangers". Journal of Magnetism and Magnetic Materials. 321 (7): 758–762. doi:10.1016/j.jmmm.2008.11.044.
  8. ^ Smart Materials Structures of Systems Allied Publishers ISBN 8170239583 page 23–25