Magnetic absolute angular position sensor for valves...

Details Magnetic absolute angular position sensor for valves... Magnetic absolute angular position sensor for valves...

2005-10-25

2005-10-25

LeDynh, Bot (Department: 2862)

Electricity: measuring and testing

Magnetic

Displacement

C324S174000

Reexamination Certificate

active

06958600

ABSTRACT:
The invention finds application in the field of electric valve actuators.Particularly, the invention relates to a magnetic absolute angular position sensor for valves controlled by electric part-turn actuators, wherein the rotation α of the valve shaft (10) induces a change in the direction along which the lines of the magnetic field generated by a magnet (8) integral therewith, pass through a stationary circuit board (7), containing two Wheatstone bridges arranged at 45° to each other, and made of a magneto-resistive material. Hence, two 90° electric signals X and Y are generated, having the same amplitude, which allow to uniquely determine the angle of rotation α of the shaft (10).

REFERENCES:
patent: 5055781 (1991-10-01), Sakakibara et al.
patent: 6326781 (2001-12-01), Kunde et al.
patent: 6498479 (2002-12-01), Hamaoka et al.
patent: 2004/0095132 (2004-05-01), Carlson et al.

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