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Fixture to Measure Shorted Turn Quality

IP.com Disclosure Number: IPCOM000046898D
Original Publication Date: 1983-Aug-01
Included in the Prior Art Database: 2005-Feb-07
Document File: 2 page(s) / 35K

Publishing Venue

IBM

Related People

Bakken, WP: AUTHOR [+2]

Abstract

Fixture 10 comprises electrical coil 12 wound on core 14. Coil 12 is connected with LCR meter 16 so that the inductance of coil 12 can be measured using meter 16 with and without the presence of part 18 on fixture 10. The inductance of coil 12 with part 18 on the fixture is a measure of the dimensions of part 18 and its electrical conductivity which, in turn, is a measure of its hardness. Core 14 is of metal and has a pair of opposite end flanges 20 and 22. Coil 12 is wound on core 14 between flanges 20 and 22. Coil 12 may consist of about 300 turns of two layers of about 150 turns each and terminating at notch 24 with leads 26 and 28 by means of which coil 12 is connected with meter 16. Core 14 is fixed on base 30, and tubular support ring 32 is disposed on top of base 30.

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Fixture to Measure Shorted Turn Quality

Fixture 10 comprises electrical coil 12 wound on core 14. Coil 12 is connected with LCR meter 16 so that the inductance of coil 12 can be measured using meter 16 with and without the presence of part 18 on fixture 10. The inductance of coil 12 with part 18 on the fixture is a measure of the dimensions of part 18 and its electrical conductivity which, in turn, is a measure of its hardness. Core 14 is of metal and has a pair of opposite end flanges 20 and 22. Coil 12 is wound on core 14 between flanges 20 and 22. Coil 12 may consist of about 300 turns of two layers of about 150 turns each and terminating at notch 24 with leads 26 and 28 by means of which coil 12 is connected with meter 16. Core 14 is fixed on base 30, and tubular support ring 32 is disposed on top of base 30. Screws 34 extend downwardly through ring 32 for the purpose of mounting fixture 10. Epoxy layer 36 is disposed about core 14 and has the same outer diameter as flanges 20 and 22. After coil 12 is wound on core 14, the epoxy may be coated on the outer surface of coil 12, and it is then machined down to provide the epoxy layer 36 of the same external diameter as the flanges 20 and
22. The part 18 to be tested is tubular and has the central longitudinal constant diameter opening 38 through it. This opening is intended to be just slightly greater in diameter than the diameter of the flanges 20 and 22 and of the completed core/coil assembly including core 14,...