Magnetoresistive encoder for tracking the angular position of a

Details Magnetoresistive encoder for tracking the angular position of a Magnetoresistive encoder for tracking the angular position of a

1994-06-20

1998-05-19

O'Shea, Sandra L.

Electricity: measuring and testing

Magnetic

Displacement

32420721, 338 32R, G01B 730, H01L 4308

Patent

active

057540420

ABSTRACT:
An apparatus for detecting precise angular positions of a rotating object. Two magnetoresistors (MRs) are positioned adjacent a target wheel attached to the rotating object, the target wheel having at least one element of finite length. Each MR is responsive to the passage of at least one of the elements as the target wheel is rotated, generating an analog signal with signal transitions between two voltage levels at the passage of the element's leading and trailing edges. The MRs are positioned relative to the elements such that their signals are phase shifted with respect to one another, resulting in time overlapping signals which intersect at a precise angular positions of the target wheel.

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