Contactless speed or position sensor using a differential hall s

Details Contactless speed or position sensor using a differential hall s Contactless speed or position sensor using a differential hall s

1993-11-23

1997-03-25

Snow, Walter E.

Electricity: measuring and testing

Electrical speed measuring

Including speed-related frequency generator

3242072, G01P 348, G01P 354, G01R 3306

Patent

active

056148216

ABSTRACT:
A configuration for contactless detection of the rpm or speed or of the position of a sensor part includes a differential Hall sensor having a carrier plate with two sides, a permanent magnet disposed on one of the sides, and Hall elements secured on the other of the sides for scanning teeth or segments and gaps of a sensor part of ferromagnetic material being rotatable about an axis or linearly movable in a given direction of motion. According to one embodiment, the carrier plate has an axis of symmetry being perpendicular to the carrier plate and perpendicular to the given direction of motion, and the permanent magnet has a direction of magnetization forming a predetermined magnetization angle with a normal to the given direction of motion. According to another embodiment, the carrier plate has an axis of symmetry being perpendicular to the carrier plate and forming a predetermined carrier plate angle with a normal to the given direction of motion, and the permanent magnet has a direction of magnetization forming a predetermined magnetization angle with a normal to the given direction of motion.

REFERENCES:
patent: 4518918 (1985-05-01), Avery
patent: 4725776 (1988-02-01), Onodera et al.
Siemens Publ. No. TLE 4920 F/G, Jul. 25, 1990, pp. 1-25 "Differential Gear Tooth Sensor IC TLE 4920 F/G".

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