Browse Prior Art Database

Reference Position Sensor

IP.com Disclosure Number: IPCOM000096409D
Original Publication Date: 1963-May-01
Included in the Prior Art Database: 2005-Mar-07
Document File: 2 page(s) / 40K

Publishing Venue

IBM

Related People

Knox, LA: AUTHOR [+3]

Abstract

Various devices, shaft angle digitizers for example, require some manner of indicating precisely a given reference position, either linear or, as here, rotational angle position. Non-magnetic base 10 of disc-like construction is mounted for rotation about axis 11. Spiraling path 12 of low magnetic reluctance material having a single discontinuity is carried by a major surface of base 10.

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Reference Position Sensor

Various devices, shaft angle digitizers for example, require some manner of indicating precisely a given reference position, either linear or, as here, rotational angle position. Non-magnetic base 10 of disc-like construction is mounted for rotation about axis 11. Spiraling path 12 of low magnetic reluctance material having a single discontinuity is carried by a major surface of base 10.

Three -legged electromagnetic transducer 13 is fixedly mounted adjacent with its operating portions opposed to path 12. This is in such relation that rotation of the disc base about its axis causes a continuous gradual change of opposition of the path to the different core legs. Such occurs except at the point of discontinuity where a sharp change from one extreme to the other is encountered.

Energization of the primary P provides the output signal shown at the secondaries S1 and S2 dependent upon the relative positioning arrangement with the discontinuity signal being that at 0 degrees.

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