Hall effect encoder apparatus

Details Hall effect encoder apparatus Hall effect encoder apparatus

1987-12-21

1990-07-17

Yusko, Donald J.

Communications: electrical

Continuously variable indicating

With particular transmitter

101 91, 101110, 341 15, G08C 1906

Patent

active

049423940

ABSTRACT:
An encoder for a wheel or other devices with relative movement comprises in the use of a printwheel, a linear Hall-effect sensor and magnet mounted in a non-ferrous metal shaft with a flux conducting spiral ring molded in the printwheel and encircling the shaft. The angular position of the printwheel is absolutely determined by the magnitude of the signal relative to the transition point of the spiral. The values are converted to digital information and stored in non-volatile memory for comparison to the values measured as the wheel is positioned during operation of the wheel. In another embodiment, a second Hall-effect sensor is placed on the shaft opposite the first sensor to provide an enhanced signal.

REFERENCES:
patent: 4293837 (1981-10-01), Jaffe et al.
patent: 4398458 (1983-08-01), Denzin et al.
patent: 4719419 (1988-01-01), Dawley
patent: 4728950 (1988-03-01), Hendrickson et al.
patent: 4746859 (1988-05-01), Malik
patent: 4754220 (1988-06-01), Shimizu et al.

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