Direct flux regulated permanent magnet brushless motor utilizing sensorless control by dc and ac excitation

摘要

A flux regulated permanent magnet brushless motor has a stator having an inner peripheral bore. A permanent magnet rotor (21) is mounted within the inner peripheral bore. A control winding (24) is supplied to a DC current to regulate flux of the machine. A small AC current is also supplied and an output is sensed (114) to determine (119) a position of the permanent magnet rotor.