CONTROL CIRCUIT FOR A BRUSHLESS DC MOTOR

摘要

The control circuit for a brushless DC motor includes a rotor having a series of alternating magnetic fields and a stator having several armature windings. The control circuit comprises at least one pair of hall generators fixedly mounted with respect to the rotor for sensing the angular position of the rotor to generate a switching signal. An input torque command signal is applied sequentially to the armature windings in response to the switching signal to rotate the rotor. The strength of magnetic field linked with the windings and the magnitude of current generated are detected.