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Elimination of Magnetostrictive Ringing in a Core Array

IP.com Disclosure Number: IPCOM000097768D
Original Publication Date: 1961-Jun-01
Included in the Prior Art Database: 2005-Mar-07
Document File: 1 page(s) / 11K

Publishing Venue

IBM

Related People

Haines, RS: AUTHOR

Abstract

Magnetostrictive ringing is encountered in the operation of magnetic memory arrays at high speeds. The magnetostrictive effects caused by high-speed operation of the cores in a matrix frequently set up mechanical vibrations. These result in noise oscillations in the sense lines following application of driving pulses. The effects are eliminated by application of a thin, flexible plastic coating to the core matrix to dampen the vibrations.

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Elimination of Magnetostrictive Ringing in a Core Array

Magnetostrictive ringing is encountered in the operation of magnetic memory arrays at high speeds. The magnetostrictive effects caused by high-speed operation of the cores in a matrix frequently set up mechanical vibrations. These result in noise oscillations in the sense lines following application of driving pulses. The effects are eliminated by application of a thin, flexible plastic coating to the core matrix to dampen the vibrations.

The coating is applied after the matrix is assembled by dipping, spraying, or other means. The coating is applied uniformly to every core in the matrix and covers the inner surfaces of the apertures in the cores as well as the outer surfaces, The coating may cover the windings of the matrix as well. The material of the coating is flexible enough to avoid straining the cores and has a low dielectric constant. It also has a non-tacky surface to avoid accumulation of dust, etc. A poly-acrylate material applied in a toluene solution yields satisfactory results.

The coating thickness is kept low to avoid undue interference with heat transfer from the cores. Coatings of 0. 002 inch and under are sufficient to dampen vibrations and do not adversely affect cooling.

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