Inductor devices – With permanent magnet
Patent
1983-09-07
1985-01-01
Pellinen, A. D.
Inductor devices
With permanent magnet
336 84R, 336 84M, 336155, 336165, H01F 2736
Patent
active
044918194
ABSTRACT:
An inductor having an air gap in its magnetic core is provided with a magnetic shield which surrounds the inductor air gap to not only reverse bias the inductor magnetic circuit so as to increase the amount of current required to achieve inductor saturation but also to return any stray flux radiating from the inductor back into the inductor magnetic circuit to reduce the radiated electromagnetic interference.
REFERENCES:
patent: 2869050 (1959-01-01), Van Urk et al.
patent: 3209295 (1965-09-01), Baermann
patent: 3519918 (1970-07-01), Bruck
patent: 3631534 (1971-12-01), Hirota et al.
patent: 3968465 (1976-07-01), Fukui et al.
patent: 4009460 (1977-02-01), Fukui et al.
patent: 4152637 (1979-05-01), Oberbeck et al.
"Designing Optimum Inductors with Ferrite Biased Gaps", by J. T. Ludwig.
"Reverse-Biased Ferrite Cores", by S. F. Shiraki/Electronic Design, 7/19/78.
"A New Reverse-Biased Choke Coil", by Akio Nakamura, et al., Proceedings of Power Con 9, 1982.
Sales Literature, "Hitachi Magnet Biased Choke Coils and Transformers", by Hitachi Magnetics Corp., 1978.
Allen-Bradley Company
Pellinen A. D.
Sammons Barry E.
Steward Susan A.
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