Electricity: measuring and testing – Magnetic – Displacement
Patent
1994-12-30
1997-10-21
O'Shea, Sandra L.
Electricity: measuring and testing
Magnetic
Displacement
338 32R, 32420725, G01B 730, G01B 714
Patent
active
056800428
ABSTRACT:
A magnetoresistive sensor for use in a rotary encoder having a drum having a circumference covered with a magnetic track at a predetermined pitch includes a plurality of magnetoresistive elements positioned opposite the drum and connected in a bridge circuit such that when the drum rotates an output signal from the bridge indicates a rotary angle of the drum. The magnetoresistive elements include one or more complementary pairs of elements positioned 180.degree. out of phase. Each of such pair of complementary magnetoresistive elements is connected in one leg of a bridge circuit such that jitter effects caused by asymmetric magnetic fields and physical differences between sensor elements are cancelled.
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Griffen Neil C.
Stokes Richard S.
Lake Shore Cryotronics, Inc.
O'Shea Sandra L.
Patidar Jay M.
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