Title:
MAGNETIC CORE FOR VARIABLE INDUCTOR
Document Type and Number:
Japanese Patent JPH01125809
Kind Code:
A
Abstract:
PURPOSE:To obtain the choke coil having excellent DC superpositional characteristics by a method wherein a small-sized magnetic core, having the magnetic characteristics different from those of the magnetic main body, is inserted into a part of a gap section. CONSTITUTION:An air gap 3 is provided in advance on the whole surface of the butt-together part of a magnetic core, and a small type magnetic core 21 having the magnetic characteristics different from those of the main body magnetic core 1 is separately inserted into said air gap part 3. Accordingly, high inductance L can be obtained in a feeble magnetic field, and on the part having an intensive superposed DC magnetic field, the choke coil having the inductance characteristics equal to the inductance provided with the ordinary air-gap for the product of a superposed DC current and the number of the coil, is constituted. As a result, excellent DC superpositional characteristics can be obtained.
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Inventors:
SUGAWARA KENJI
Application Number:
JP28443687A
Publication Date:
May 18, 1989
Filing Date:
November 10, 1987
Export Citation:
Assignee:
TOKIN CORP
International Classes:
H02M3/28; H01F27/24; (IPC1-7): H01F27/24; H02M3/28
Domestic Patent References:
| JP48071349B |