Electricity: measuring and testing – Magnetic – Displacement
Patent
1991-12-06
1992-11-17
Strecker, Gerard R.
Electricity: measuring and testing
Magnetic
Displacement
32420712, 32420725, G01B 730, G01B 714
Patent
active
051646684
ABSTRACT:
An angular position sensor is provided with first and second pole pieces that extend from regions proximate a rotatable magnet to regions proximate a magnetically sensitive device. The pole pieces provide defined magnetic paths of lowered reluctance that confine the lines of flux extending between the rotatable magnet and the magnetically sensitive device. The placement of the rotatable magnet between first and third pole piece segments of the invention significantly reduces the sensitivity of the sensor to variations in position of the rotatable magnet and therefore increases the reliability of the measurement system. This reduced sensitivity inhibits the degradation of operational accuracy that could otherwise be caused by inaccuracies in the magnet's shaft position, large tolerances in the dimensions of the shaft diameter and the bearing diameter and variable location of the shaft because of excessive bearing wear.
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article "Annular Magnet Position Sensor" by G. & V. Lemarquand IEEE Transactions on Magnetics vol. 26, No. 5, Sep. 1990.
Honeywell Inc.
Lanyi William D.
Strecker Gerard R.
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