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Electromagnetic Position Indicator

IP.com Disclosure Number: IPCOM000098916D
Original Publication Date: 1958-Dec-01
Included in the Prior Art Database: 2005-Mar-08
Document File: 2 page(s) / 40K

Publishing Venue

IBM

Related People

Howery, NK: AUTHOR

Abstract

This indicator provides an indication of the position of a member, movable to a number of discrete locations. The device comprises a U-shaped core member located at each of the discrete locations, a primary and a secondary winding for each core and an armature which is mounted for movement with the positionable member. AB: A voltage impressed on the primary coil from an external source induces a voltage in the secondary winding which rises and falls in amplitude as the armature passes over the pole tips. The peak of this voltage amplitude variation corresponds to the home position of the movable member.

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Electromagnetic Position Indicator

This indicator provides an indication of the position of a member, movable to a number of discrete locations. The device comprises a U-shaped core member located at each of the discrete locations, a primary and a secondary winding for each core and an armature which is mounted for movement with the positionable member. AB: A voltage impressed on the primary coil from an external source induces a voltage in the secondary winding which rises and falls in amplitude as the armature passes over the pole tips. The peak of this voltage amplitude variation corresponds to the home position of the movable member. The output of the secondary is connected to a level sensing circuit to provide the indication of the home position, AB: To prevent wear on the armature it may be a cylindrical member mounted in bearings so that it is free to roll across the pole tips in the event it comes in contact with the core.

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