A comparison between a two-material and three-material magnetic current limiter | Zendy

S.J. Young | Zendy; F.P. Dawson | Zendy; M. Iwahara | Zendy; Satoshi Yamada | Zendy

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A comparison between a two-material and three-material magnetic current limiter

Author(s) -

S.J. Young,

F.P. Dawson,

M. Iwahara,

Satoshi Yamada

Publication year - 1998

Publication title -

journal of applied physics

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 0.699

H-Index - 319

eISSN - 1089-7550

pISSN - 0021-8979

DOI - 10.1063/1.367532

Subject(s) - magnet , neodymium magnet , limiter , saturation (graph theory) , materials science , saturation current , inductance , current density , magnetic flux , condensed matter physics , magnetic core , magnetic field , mechanics , nuclear magnetic resonance , physics , electromagnetic coil , mechanical engineering , electrical engineering , voltage , engineering , mathematics , combinatorics , quantum mechanics

This paper investigates the inductance versus current characteristics of a two-material and a three-material magnetic current limiter. The two-material device consists of a NdFeB permanent magnet, a high saturation flux density magnetic material, and a high saturation flux density magnetic pole piece placed on both sides of the magnet. The three-material device consists of a NdFeB permanent magnet, a high saturation flux density magnetic material, and a low saturation flux density material. Finite-element results for the three-material device agree with the results obtained using design equations. In contrast, the results obtained for the two-material device show that the transition current is overestimated and that the ratio of the maximum safe current and transition current, as well as the unsaturated inductance is underestimated. Extending the magnet beyond the adjoining surfaces improves the sharpness of the transition characteristics when the ratio of the core length to the core width is large. © 1998 American Institute of Physics

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