Magnetoresistive position sensor including an encoder wherein th

Details Magnetoresistive position sensor including an encoder wherein th Magnetoresistive position sensor including an encoder wherein th

1994-03-16

1996-08-13

O'Shea, Sandra L.

Electricity: measuring and testing

Magnetic

Displacement

32420725, G01B 714, G01B 730

Patent

active

055459854

ABSTRACT:
In a preferred embodiment, a magnetoresistive (MR) position sensor, including: a rotatable cylindrical encoder wheel having a plurality of alternating N and S magnetic poles spaced a constant pole pitch around the circumferential surface of the encoder wheel, adjacent ones of the N and S poles having interfacing edges parallel to the axis of rotation of the encoder wheel; a first MR sensing array disposed on an insulative substrate in proximity to the circumferential surface of the encoder wheel, such as to sense rotating magnetic fields produced by the N and S poles as they pass the first MR sensing array as the encoder wheel rotates, the first MR sensing array including at least a first section comprising at least two legs extending parallel to the interfacing edges, the at least two legs being joined in series so as to form a serpentine shape; apparatus to apply a constant DC voltage across terminal ends of the serpentine shape.

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patent: 5243280 (1993-09-01), Kusumi
patent: 5325056 (1994-06-01), Shonowaki et al.

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