Patent ID: 6563412
Filing Date: 2003-05-13
Classification: H01F

Abstract:
A rotary variable differential transformer apparatus for determining angular position of a rotor, comprising:a stator support structure; a first pair of magnetically permeable stator elements substantially supported by the stator support structure, the magnetically permeable stator elements being connected to each other by a magnetically permeable first connecting member; a second pair of magnetically permeable stator elements substantially supported by the stator support structure, the magnetically permeable stator elements being connected to each other by a magnetically permeable second connecting member; circuitry for generating a position indicator signal, including an array of planar coils formed on a multi-layer printed circuit board coupled to the first pair of magnetically permeable stator elements and the second pair of magnetically permeable stator elements; and a rotor rotatably mounted within the stator support structure and substantially surrounded by the first and second pairs of magnetically permeable stator elements, the rotor having a magnetic flux conducting element which magnetically couples each element of the first pair of magnetically permeable stator elements and each element of the second pair of magnetically permeable stator elements in a manner which varies in proportion to an angular position of the rotor.