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Improvements In Magnetic Cores

IP.com Disclosure Number: IPCOM000098357D
Original Publication Date: 1960-Aug-01
Included in the Prior Art Database: 2005-Mar-07
Document File: 2 page(s) / 31K

Publishing Venue

IBM

Related People

Hottenrott, HG: AUTHOR

Abstract

The present trend toward higher speeds in data handling equipment has created a need for bistable magnetic cores having faster switching characteristics and lower drive requirements than those presently in commercial use. These characteristics may be improved with known ferrite materials by reducing the diametrical and cross sectional dimensions of the cores. However, such considerations as required mechanical strength, ease of tooling and handling, etc., impose practical limitations on the general miniaturization of the component.

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Improvements In Magnetic Cores

The present trend toward higher speeds in data handling equipment has created a need for bistable magnetic cores having faster switching characteristics and lower drive requirements than those presently in commercial use. These characteristics may be improved with known ferrite materials by reducing the diametrical and cross sectional dimensions of the cores.

However, such considerations as required mechanical strength, ease of tooling and handling, etc., impose practical limitations on the general miniaturization of the component.

These limitations are avoided, and ferrite cores of extremely small effective dimensions are provided, by constructing cores with configurations such as those shown. Each of these configurations includes a portion A of small dimensions bounded by a larger body B. The portions A are the active core portions. Because of their reduced dimensions, they may be switched more rapidly and with smaller drive currents than would be required to switch the portions B. The inactive portions B lend mechanical strength and also serve as heat dissipating media during operation.

The configurations shown at the left and center provide cores of double switching thresholds, while the configuration at the right provides a graded coercive force, each incremental ring of material having a coercivity incrementally larger than the next inner ring.

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