Method of making a magnetic-encoding device having hall effect d

Details Method of making a magnetic-encoding device having hall effect d Method of making a magnetic-encoding device having hall effect d

1988-12-16

1990-02-06

Echols, P. W.

Metal working

Method of mechanical manufacture

Electrical device making

H01F 706

Patent

active

048979147

ABSTRACT:
Reproducibility in the manufacture of rotating shaft sensing encoders and similar devices employing Hall effect switching devices to sense changes in magnetic fields is achieved in the present invention by forming a frame of the encoder as a unitary or one piece arrangement for both supporting a shaft bearing and an angular behavior sensor, such as a Hall effect switch, thus controlling tolerances, air gaps and angular orientation of the sensor. Calibration of such a device to compensate for manufacturing variability in the Hall sensing device as well as any other variabilities in the encoder is then achieved by providing a reversable calibrating magnetic field close to the Hall effect switch and moving that magnetic field until the desired switch calibration is achieved.

REFERENCES:
patent: 3636767 (1972-01-01), Duffy
patent: 3742243 (1973-06-01), Gamble
patent: 4110676 (1978-08-01), Edick et al.
patent: 4216458 (1980-08-01), Edwards
patent: 4295118 (1987-10-01), Herr et al.
patent: 4635353 (1987-01-01), Tamagne
patent: 4691185 (1987-09-01), Loubier et al.

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