An angular position sensor employs a pair of magnets that are disposed on a rotating cylinder at opposite ends of a diameter of the cylinder. A hall-effect flux sensor is fixed within the cylinder and offset from a line of geometric and magnetic symmetry b...

Commutation pulses of a d.c. motor (1) are accurately counted to determine the position of an associated power accessory (11) by using high speed switches in a bridge circuit (S1-S4). When power is disconnected from the motor, the switches recirculate a re...