Electricity: measuring and testing – Magnetic – Displacement
Patent
1998-06-16
2000-07-11
Snow, Walter E.
Electricity: measuring and testing
Magnetic
Displacement
3242072, 21912168, G01B 714, G01B 730, G01R 3306, H01L 4306, B23K 7600
Patent
active
060878274
ABSTRACT:
This invention pertains to an incremental sensor of position and/or speed, of the type which includes a moving component made of a soft material that has at least one moving tooth in a direction OZ with respect to a permanent magnet magnetized along the direction OY, which is approximately perpendicular to the OZ axis, and a probe which is sensitive to the direction and strength of the magnetic field, such as a Hall-effect gaussmeter, arranged in the air gap between the magnet and the tooth of the moving component so that its axis of greatest sensitivity is approximately oriented along the OZ axis. The Hall-effect gaussmeter is located near a singular point of the OZ axis where the average value of the magnetic field is weak and preferably less than .+-.20 mT and approximately equal to the average value of the alternating field of the integrated circuit connected to the Hall-effect gaussmeter. The permanent magnet can also be laser trimmed to achieve the desired operation in the Hall-effect gaussmeter.
REFERENCES:
patent: 5916459 (1999-06-01), Schroeder et al.
Moving Magnet Technologies (S.A.)
Snow Walter E.
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