Linear magnetic core potentiometer

Details Linear magnetic core potentiometer Linear magnetic core potentiometer

G - Physics

01

B

340/135.6

G01B 7/30 (2006.01) G01D 5/22 (2006.01)

Patent

CA 1081820

LINEAR MAGNETIC CORE POTENTIOMETER Abstract of the Disclosure A contactless linear position sensor, or potentiometer, which h as a linear output characteristic, is constructed with a pair of elongated, hollow cylindrical tubes which are made of magnetically saturable material and are aligned so that their axes form an angle of less than 180°, with both of said tubes having at least one conductive wire coupled therewith which is interconnected with the wire that is coupled with the other tube, and a moveable permanent magnet which is formed as a segment of a circular ring with a pair of straight sides that move adjacent to the tubes so that the total volume of the tubes that is magnetically saturated remains substantially constant while the inductance ratio of the tubes varies. The present invention is directed to a version of this type of contactless device which has improved tem- perature performance that is achieved by the use of a magnetically permeable pole piece positioned adjacent the moving magnet which is substantially the same shape as the magnet and the magnetically per- meable flux enhancer which is positioned so that the tubes are located intermediate the flux enhancer and the moveable magnet.

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