Magneto-resistance type contactless rotational angle detecting a

Details Magneto-resistance type contactless rotational angle detecting a Magneto-resistance type contactless rotational angle detecting a

1979-10-05

1982-11-16

Strecker, Gerard R.

Electricity: measuring and testing

Magnetic

Displacement

324174, G01B 714, G01P 348

Patent

active

043596851

ABSTRACT:
A rotational angle detecting apparatus employs a bridge circuit of four magneto-resistance elements arranged in a plane and placed in a fixed magnetic field so that the plane of the bridge circuit is parallel to the direction of the magnetic field and is rotatable around the axis perpendicular to the plane. One pair of diagonally disposed magneto-resistance elements further includes resistors respectively such that the direction of the potential difference obtained at one pair of opposite junctions of the bridge circuit is always constant although the magnitude thereof is varied depending on the direction of the magnetic field.
The output potential difference from the bridge circuit is amplified by a D.C. amplifier including an operational amplifier and a transistor to deliver an output voltage across a collector resistor of the transistor.

REFERENCES:
patent: 3636767 (1972-01-01), Duffy
patent: 3818326 (1974-06-01), Masuda et al.
patent: 3846697 (1974-11-01), Cila et al.

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