Sensor and method for determining angular position including measuring magnetic field lines at a distance greater than the inner radius and less than the outer radius of a ring magnet, and at a distance greater than the outer radius or less than the inner radius

摘要

An angle sensor includes a ring magnet adapted to be attached to a rotatable shaft. The ring magnet has an axis of rotation and an inner radius and an outer radius extending from the axis of rotation to define an annulus. A first magnetic sensor is situated proximate the ring magnet to measure magnetic field lines within the annulus, and a second magnetic sensor is situated proximate the ring magnet to measure magnetic field lines outside the annulus.