SINGLE WINDING BACK EMF SENSING BRUSHLESS DC MOTOR.

摘要

A method and controller for electronically commutating a permanent magnet brushless dc motor (21) under closed loop control where current is commutated (22) through successive combinations of two out of three stator windings to produce a rotating flux. Commutations are determined by each 60 degree angular position of the rotor by sensing the back EMF (24) induced in only one of the three stator windings whenever that winding has no applied current flowing in it to determine the 0 degree and 180 degree positions and extrapolating the 60 degree , 120 degree , 240 degree and 300 degree positions by dividing the time interval therebetween by a factor of 3.