Thermal Compensation Model of Magnetic Circuits with Modern Magnetic Materials
T. Szumiata and M. Gzik-Szumiata
Department of Physics, University of Technology and Humanities in Radom, Krasickiego 54, 26-600 Radom, Poland
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In this work a quantitative analysis of thermal compensation has been performed for a magnetic circuit producing magnetic field in the air gap. The considered system consists of Sm3Co17 type permanent magnet (as a source of magnetic field), nanocrystalline FINEMET alloy (as ultra-soft magnetic medium) and Fe-Ni low Curie temperature compensative material (as a magnetic shunt). Distribution of magnetic field induction in the circuit has been calculated numerically within standard one-dimensional approximation, considering nonlinearities of compensative material as well as demagnetization susceptibility of permanent magnet. It has been theoretically predicted, that an appropriate choice of the compensative element thickness improves significantly thermal stability of magnetic field in the air gap.

DOI: 10.12693/APhysPolA.127.650
PACS numbers: 75.50.Ww, 75.50.Vv, 75.50.Kj, 75.50.Bb, 07.55.Db