An apparatus for determining an incremental angular position of a rotating member of an induction motor. A sensor assembly is positioned adjacent a target wheel attached to the rotating member, the target wheel having a plurality of teeth, separated by slots, angularly spaced around the periphery of...http://www.google.ca/patents/US6232739?utm_source=gb-gplus-sharePatent US6232739 - High-resolution incremental position sensor with pulse switching strategy
