D.C. brushless motor having wider and narrower pole parts

摘要

A D.C. brushless motor wherein one of projected stator poles positioned forward and rearward in rotational direction of a rotor is deviated from a circumferentially equally spaced position with respect to the other stator pole by a predetermined electric angle and is made sufficiently smaller than the other, the stator poles being respectively polarized depending on controllably varied direction of direct current to coils on the poles by means of a rotor position detecting Hall element which detects the polarity at a predetermined position of the rotor, for allowing the rotor to self-start with a remarkably increased starting torque.