Patent ID: 6326781
Filing Date: 2001-12-04
Classification: G01D,G01R

Abstract:
Apparatus for sensing and indicating the angular position of a first rotor mounted for 360 degree rotation about a first axis, the apparatus comprising:a pair of stationary magnetoresistive sensors having magnetically sensitive axes at right angles to each other;two-pole permanent magnet means connected for rotation with the rotor and axially spaced from said sensors for generating a non-saturating rotating magnetic field of substantially uniform intensity across said sensors with magnetic shunt as the rotor rotates through 360 degrees of rotation;means for shielding the sensors from external magnetic sources;first circuit means for supplying an input voltage to the sensors, said input voltage resulting in a pair of periodic output voltages offset by 90 degrees phase shift and associated with respective ones of said sensors;second circuit means for conditioning said output voltages to produce a pair of associated conditioned voltage signals proportional to the periodic sine and cosine of the rotor angle; andmeans for indicating the rotor angle through 360 degrees of rotation formulated from a continuous non-linear function of the ratio of said conditioned voltage signals with aircore meter.