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Ferrite Core Insulation Coating by Electrophoresis

IP.com Disclosure Number: IPCOM000078482D
Original Publication Date: 1973-Jan-01
Included in the Prior Art Database: 2005-Feb-26
Document File: 2 page(s) / 36K

Publishing Venue

IBM

Related People

Limeri, JT: AUTHOR [+2]

Abstract

Ferrite core material for use in electromagnetic components, by its inherent abrasive characteristic, can abrade the insulation from the wire during the wiring or winding of the coil onto the core element. Depending on the orientation of the exposed wire conductors, core-to-coil or coil-to-coil shorting conditions can exist, both of which are undesirable.

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Ferrite Core Insulation Coating by Electrophoresis

Ferrite core material for use in electromagnetic components, by its inherent abrasive characteristic, can abrade the insulation from the wire during the wiring or winding of the coil onto the core element. Depending on the orientation of the exposed wire conductors, core-to-coil or coil-to-coil shorting conditions can exist, both of which are undesirable.

This problem can be eliminated by coating the abrasive cores to a substantial thickness, by electrophoretic deposition of a dielectric material from an aqueous dispersed medium. This approach accomplishes two purposes. Firstly, this coating almost completely eliminates sharp abrasive edges, thus reducing the likelihood of coil abrasion. Secondly, the coating, being a dielectric material, precludes the core-to-coil defects mentioned above.

A suitable coating material is POWERCLAD* H74WC14 white enamel. Process conditions for application of this system when mixed to supplier's specifications for initial charge are: 1) Bath temperature range: 75 degrees - 80 degrees F. 2) pH: (at 77 degrees F.) 7.1 (initial) - 9.7 + or - 0.10 3) Solids Content (%) 11.0 (initial) - 5.0 4) Voltage DC/Time 90-100/3 minutes + or - 5 sec. 5) Rinse H(2)O Temp. 70 degrees - 80 degrees F. 6) Curing Temp./Time 365 degrees - 370 degrees F./25 min.

The core 10 is supported in the bath 12 by a copper wire 14 depending from a copper rod 16, the anode. If desired, several cores wired in parallel...