System for sensing the angular position of a rotatable member us

Details System for sensing the angular position of a rotatable member us System for sensing the angular position of a rotatable member us

1987-03-19

1988-12-06

Eisenzopf, Reinhard J.

Electricity: measuring and testing

Magnetic

Displacement

324225, 324252, 338 32H, G01B 714, G01N 2772, G01R 3302, H01L 4306

Patent

active

047898267

ABSTRACT:
Angular rotation of a member, such as the shaft of a tension arm assembly, is sensed by the combination of a circular type of magnet secured to the rotatable member and selectively polarized relative to its diameter to define a magnetic north-south pole pair, and a stationary Hall Effect transducing device secured in close and constant proximity to the ring magnet. A circuit coupled to the transducing device includes offset and amplification stages. In a preferred embodiment, the Hall Effect transducing device is located in the region of a magnetic null of the field generated by the magnetic poles, when the rotatable member is in a selected angular position. The constant gap between the transducing device and the circular magnet optimizes the generation of a linear output via the circuit, to accurately sense the member rotation.

REFERENCES:
patent: 4371836 (1983-01-01), Sieverin
patent: 4540964 (1985-09-01), Blecke

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