Hall effect sensing apparatus and method

Details Hall effect sensing apparatus and method Hall effect sensing apparatus and method

1984-09-20

1989-05-09

Eisenzopf, Reinhard J.

Electricity: measuring and testing

Magnetic

Displacement

324202, 307309, 338 32H, G01R 3500, G01B 714, H03K 1790, H01L 4500

Patent

active

048292486

ABSTRACT:
Reproducability 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: 2551265 (1951-05-01), Hansen, Jr.
patent: 3636767 (1972-11-01), Duffy
patent: 3742243 (1973-06-01), Gamble
patent: 4110676 (1978-08-01), Edick et al.
patent: 4295118 (1981-10-01), Herr et al.
patent: 4443716 (1984-04-01), Avery
patent: 4691185 (1987-09-01), Loubier et al.

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