APPARATUS FOR GENERATING MUTUALLY ORTHOGONAL SINUSOIDAL SIGNALS UTILIZING ORTHOGONAL HALL PLATES WHICH ARE RELATIVELY ADJUSTABLE

摘要

Angular displacement measuring apparatus wherein a pair of Hall effect cells orthogonally disposed and affixed to a stator element are disposed within a magnetic field generated by a pair of permanent magnets affixed to a rotor element is disclosed. In response to a control current passing through such pair of Hall effect cells a Hall effect voltage is generated within each one of such cells, the magnitude of such voltage being related to the sine and cosine of the angular displacement between the rotor element and stator element. The Hall effect cells are orthogonal to within a tolerance of two minutes of arc. Such tolerance is achieved by affixing each one of the Hall effect cells to one of two separate portions of the stator element.