Inductor devices – With closed core interrupted by an air gap
Patent
1992-02-20
1995-05-09
Kozma, Thomas J.
Inductor devices
With closed core interrupted by an air gap
336200, 336212, 336223, 336225, H01F 1706, H01F 2730
Patent
active
054144019
ABSTRACT:
A multi-pole magnetic component, such as an inductor, includes z-folded conductive film windings and a core having a plurality of pairs of spaced apart core posts extending between a base plate and a top plate of the core. The core includes an air gap that is distributed substantially evenly along the flux path. Magnetic flux flows through the core posts in a series manner so as to have an opposite flux direction in adjacent poles. Preferably, the air gap is determined such that the ratio of the distance between each adjacent core post and the distance between the base and top plates results in magnetic fields that are substantially tangential to the surface of the conductive film winding. Furthermore, the core posts are preferably shaped to have a larger cross sectional area at the base portion of the posts than at the top portion thereof. Alternatively, the core posts are attached to the bottom plate and are inserted into suitably shaped cut-out portions of the top plate. In either case, the air gap between each core post and the respective core plate is smaller around the center of the core post than at the outer edges thereof. As a result, flux is concentrated near the center of the core posts, thereby reducing fringing fields which, in turn, minimizes high-frequency winding losses.
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Roshen Waseem A.
Yerman Alexander J.
Berard C. A.
Breedlove J. M.
Kozma Thomas J.
Martin Marietta Corporation
Meise W. H.
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