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Test Method for Multi-Turn Core Windings

IP.com Disclosure Number: IPCOM000097728D
Original Publication Date: 1961-May-01
Included in the Prior Art Database: 2005-Mar-07
Document File: 3 page(s) / 42K

Publishing Venue

IBM

Related People

Sanborn, MA: AUTHOR

Abstract

This device tests the number of turns in a particular winding of a square hysteresis loop core of assumed acceptable quality. The core also has other windings of known numbers of turns. The apparatus is particularly useful in testing cores which have been assembled into a matrix where the core windings are interconnected in a particular manner. The procedure for testing core 6 is employed in testing all other matrix cores. The multi-turn winding 14 on core 6 is the inhibit winding, while windings 11, 12, 13 and 15 are the X, Y, bias, and sense windings, respectively.

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Test Method for Multi-Turn Core Windings

This device tests the number of turns in a particular winding of a square hysteresis loop core of assumed acceptable quality. The core also has other windings of known numbers of turns. The apparatus is particularly useful in testing cores which have been assembled into a matrix where the core windings are interconnected in a particular manner. The procedure for testing core 6 is employed in testing all other matrix cores. The multi-turn winding 14 on core 6 is the inhibit winding, while windings 11, 12, 13 and 15 are the X, Y, bias, and sense windings, respectively.

To effect the test, pulse generating apparatus is used. This includes X driver 1, Y driver 2, bias driver 3, and inhibit driver 4, all under the directive control of program apparatus 5. Apparatus elements 1... 5 are effective for sequentially producing sets of current pulses on various sets of X, Y, and inhibit drive lines such as 7, 8 and 10, respectively, as well as on common bias line 9. The pulses on each set of drive lines and the common bias drive line are in time coincidence. Within the matrix which includes core 6, windings 11, 12 and 13 are connected to lines 7, 8 and 9, respectively. Each pulse appearing generates an mmf in core 6 in a setting direction. The inhibit pulse on line 10 is connected to winding 14 and generates an mmf in the opposite, resetting direction. The relationship of the various mmf components is indicated in the drawing which also shows a hysteresis loop of a representative core.

The test performed is divided into first and second sequential steps. The first tests 14 for a number of turns which is equal to or greater than the required number of turns. Elements 1... 3 produce on lines 7, 8 and 9 current pulses of fixed amplitude which generate within 6 an mmf expressed as vectors X, Y and Ba. At the same time, element 4 produces a pulse on line 10 which generates in 6 an mmf expressed as vector I. In the event that the number of turns in 14 is equal to or greater than the expected number, the current in 14 is effective to limit the net mmf in a setting direction to slightly above the critical value T. The result is that core 6 is switched only sligh...