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Test Fixture for Confining a Magnetic Flux Path for Coercive Force Measurement

IP.com Disclosure Number: IPCOM000046711D
Original Publication Date: 1983-Aug-01
Included in the Prior Art Database: 2005-Feb-07
Document File: 2 page(s) / 27K

Publishing Venue

IBM

Related People

Hahn, CG: AUTHOR [+2]

Abstract

Measurement of the coercive force of a non-toroidal part usually required cutting a sample from the part for the measurement. Parts which have a shape such as hour-glass shape can be paired together and, in effect, form a toroid. Bobbin housings 10 and 20 in the drawing are the parts for which the coercive force measurement is to be made. These parts, in this instance, have a small diameter end 11 and a large diameter end 12. The two housings are placed together so that the large diameter end of one housing is in contact with the length of the small diameter end of the other housing. For convenience, tape is applied to hold the housings 10 and 20 together.

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Test Fixture for Confining a Magnetic Flux Path for Coercive Force Measurement

Measurement of the coercive force of a non-toroidal part usually required cutting a sample from the part for the measurement. Parts which have a shape such as hour-glass shape can be paired together and, in effect, form a toroid. Bobbin housings 10 and 20 in the drawing are the parts for which the coercive force measurement is to be made. These parts, in this instance, have a small diameter end 11 and a large diameter end 12. The two housings are placed together so that the large diameter end of one housing is in contact with the length of the small diameter end of the other housing. For convenience, tape is applied to hold the housings 10 and 20 together.

Soft iron plates 15, having coercive force values less than the housings 10 and 20, are placed at the ends of the housings 10 and 20, and a clamp is used to hold the plates firmly in contact with the housings 10 and 20. Plates 15 provide an additional flux path in the magnetic circuit whereby sufficient magnetic flux is transferred through the contacting housing surfaces and plates 15 to nearly magnetically saturate the small cross-section of necks 13 and 23 of housing 10 and 20, respectively. Coils of wire are wound around the necks 13 and 23 of housings 10 and 20, respectively. Coil 24 is the primary winding and coil 14 is the secondary winding for the magnetic test circuit. A conventional hysteresigraph is used to obtain the hyste...