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Forming Windings on Cores

IP.com Disclosure Number: IPCOM000090439D
Original Publication Date: 1969-Apr-01
Included in the Prior Art Database: 2005-Mar-05
Document File: 2 page(s) / 53K

Publishing Venue

IBM

Related People

Brickl, DE: AUTHOR [+2]

Abstract

The process is for forming windings on one-piece torroidal magnetic cores, suitable for employment in the mass production of miniature transformers. Ferrite core 1 is formed with recesses which constitute continuous bit filar spirals 2 about the entire body. Recessed core 1, after firing, is then coated with insulation 3 by conventional processes such as evaporation sputtering or spinning. Coating 4 of copper or other conductive metals is overlaid on insulation 3 by processing techniques such as evaporation, sputtering, or electroless plating, and then a heavier conductive layer found by electroplating. As shown at the lower right, windings are formed by removing ridges 5 with abrasive methods, e. g., lapping or honing.

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Forming Windings on Cores

The process is for forming windings on one-piece torroidal magnetic cores, suitable for employment in the mass production of miniature transformers. Ferrite core 1 is formed with recesses which constitute continuous bit filar spirals 2 about the entire body. Recessed core 1, after firing, is then coated with insulation 3 by conventional processes such as evaporation sputtering or spinning. Coating 4 of copper or other conductive metals is overlaid on insulation 3 by processing techniques such as evaporation, sputtering, or electroless plating, and then a heavier conductive layer found by electroplating. As shown at the lower right, windings are formed by removing ridges 5 with abrasive methods, e. g., lapping or honing. To tailor different turns, ratios or electrical characteristics the continuous windings are broken at desired places by an abrasive jet or equivalent. This structure allows mounting of these devices on printed circuits by solder reflow techniques. Different electrical values can be obtained by varying the printed circuit configuration and can be tuned by trimming after mounting.

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