Patent ID: 6288535
Filing Date: 2001-09-11
Classification: G01D,G01R

Abstract:
A Hall effect, shaft angular position sensor comprised of a housing, said housing including a shell having open ends and two washers, one disposed at each end of said shell, at least partially closing said open ends; a hollow cylindrical bobbin made of non-magnetic material, said bobbin rigidly disposed within said housing, axis of said bobbin and axis of said housing substantially coincide; at least one energizing electrical coil wound of insulated electrically conductive wire, said coil disposed about said bobbin, said coil lying in a plane which intersects said axis of said bobbin at an angle other than 90 degrees of arc, said energizing electrical coil providing magnetic flux flow; at least one Hall effect device supported within said shell and disposed about said coil, magnetic sensing axis of said Hall effect device substantially perpendicular to said bobbin axis, said Hall effect device magnetic sensing axis intersects said bobbin axis at a location other than said intersection point of said plane and said bobbin axis; a ferromagnetic rotor member, centrally retained within said hollow cylindrical bobbin, axis of said rotor and axis of said bobbin substantially coincide, said rotor member being asymmetrical along said rotor axis, so that an angular displacement of said rotor member about said rotor axis will vary the magnitude of said magnetic flux flow through said Hall effect device.