Patent ID: 6777928
Filing Date: 2004-08-17
Classification: G01D,H01F

Abstract:
A rotary magnetic position sensor, comprising:a stator; at least one magnetosensitive device connected with said stator, said at least one magnetosensitive device having a sensing surface; a rotor mounted around said stator, wherein one of said stator and said rotor is rotatable about a rotation axis, wherein said sensing surface is oriented parallel to said axis of rotation; and a pair of permanent magnets attached to said rotor in diametric opposition to each other, wherein said magnets have opposite poles facing each other such as to provide a magnetic field passing through said at least one magnetosensitive device at an orientation normal to said axis of rotation, wherein the magnetic field is substantially uniform over an area at least as large as said sensor surface; and wherein each said magnet comprises: a predetermined geometrical shape, said shape having a predetermined external asymmetric geometrical feature; wherein each said magnet is identical with respect to the other; and wherein said external asymmetric geometrical feature differentiates the north and south magnetic poles of each said magnet.