Patent ID: 6064198
Filing Date: 2000-05-16
Classification: G01D,G01P

Abstract:
A gear tooth sensor for sensing one or more gear teeth on a ferrous target wheel, said target wheel being rotatably mounted relative to a predetermined axis of rotation, the sensor comprising:a magnet for generating magnetic flux having opposing north and south magnetic pole faces defining a lateral surface therebetween and a magnetic axis generally perpendicular to said opposing pole faces of said magnet;a single magnetic flux responsive element which provides an output signal as a function of said magnetic flux, said magnetic flux responsive element having a predetermined sensing plane that is sensitive to said magnetic fluxa first flux concentrator at least partially disposed in a plane generally parallel to said magnetic axis and at least partially disposed adjacent to said lateral surface; anda carrier for carrying said magnet and said magnetic flux responsive element relative to said ferrous target wheel such that said magnet is disposed at a predetermined air gap relative to the periphery of said ferrous target wheel and said magnetic flux responsive element is offset from said center line of said magnet forming a zero speed sensor, said magnetic flux responsive element being disposed to at least partially overlap one of said opposing pole faces of said magnet.