Rotary position sensor.

摘要

An angular sensor has a shaped dual magnet structure (212, 214) carried upon a pole piece (210) having a generally "C"-shaped cross-section. The magnet and pole piece define a generally circular linear field which is concentric about the axis of rotation (250) of the complete rotor. A Hall effect device (510) is located in the open portion or gap between the two magnets and is exposed to a well defined field, so that by the use of particular magnet materials and a magnet geometry extending from the axis of rotation to a point beyond the Hall sensor, a precise and yet tolerant magnetic circuit is obtained.