Patent ID: 6233834
Filing Date: 2001-05-22
Classification: H01F

Abstract:
An angle measurement instrument for a rotating member having opposing flat faces, comprising:a first pair of capacitive sensors proximate one face of said rotating member;a second pair of capacitive sensors proximate the other face of said rotating member;a planar differential current transformer proximate one pair of capacitive sensors, comprising:two primary conductors, each comprising a single winding;at least one secondary conductor comprising a single winding; anda single magnetic core member surrounding said primary conductors and said secondary conductor;means for electrically connecting one capacitive sensor from each pair in parallel to one primary conductor;means for electrically connecting the other capacitive sensor from each pair in parallel to the other primary conductor; andmeans for determining from the secondary conductor, the differential currents in the primary conductors, as a measure of the angle of said rotating member to said capacitive sensors.