Incremental sensor of speed and/or position for detecting low an

Details Incremental sensor of speed and/or position for detecting low an Incremental sensor of speed and/or position for detecting low an

1995-09-15

1998-09-29

Snow, Walter E.

Electricity: measuring and testing

Magnetic

Displacement

32420712, G01B 714, G01B 730, G01R 3306, H01L 4306

Patent

active

058149856

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.

REFERENCES:
patent: 4086533 (1978-04-01), Richouard et al.
patent: 4524932 (1985-06-01), Bodziak
patent: 4745363 (1988-05-01), Carr et al.

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