Rotary position sensor with improved bearing tolerance

摘要

An angular sensor has a shaped dual magnet structure carried upon a pole piece 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 of the complete rotor. A Hall effect device is inserted into the open portion or gap between the two magnets and is exposed to a well defined field. Through the use of particular magnet materials and a magnet geometry extending from the axis of rotation to a point well beyond the Hall sensor, a precise and yet tolerant magnetic circuit is produced.