Patent ID: 9467013
Filing Date: 2016-10-11
CPC Classification: H02K

Claim Text:
1. A brushless motor comprising a rotor rotatable about an axis of rotation, and a stator disposed inside or outside the rotor, wherein: the stator comprises a yoke provided with a circumferential surface having a ring-shaped cross section and facing the rotor, and a plurality of teeth, each of the teeth radially protruding from the circumferential surface of the yoke toward the rotor and being provided, at a protruding end thereof, with a stator-side wide-width portion having both lateral sides protruding to form a widened width; and the rotor comprises a plurality of magnetic members, each of the magnetic members being provided with a rotor-side wide-width portion radially disposed at a circumferential edge of the rotor to face the stator and provided, at a stator-side end thereof, with both lateral sides protruding to form a widened width, and a plurality of magnets, each of the magnets being disposed between neighboring ones of the magnetic members such that the same magnetic poles face each other in a circumferential direction, wherein, when a number of pairs of opposite poles of the rotor is P, a length of a radial line connecting a cross-sectional surface of the rotor-side wide-width portion to the axis of rotation is R, a radial thickness of the stator-side wide-width portion is Lt, a central angle between two radial lines connecting both circumferential ends of the stator-side wide-width portion to the axis of rotation is τt, a central angle between two radial lines connecting both circumferential ends of the rotor-side wide-width portion to the axis of rotation is τr, and a central angle between two radial lines connecting centers of any two neighboring magnets to the axis of rotation is τm, the motor is set such that