Patent ID: 8618711
Filing Date: 2013-12-31
Classification: H02K

Abstract:
1. A three-phase DC motor comprising: a rotor having an outer surface and magnets, said outer surface of said rotor being configured to have alternating poles of N and S around a circumference of said rotor; a stator including a plurality of core units that are arranged around said rotor and having an inner surface opposite to said outer surface of said rotor; and three or more coils wound around said core units, said three or more coils including a first coil through which a first phase current flows, a second coil through which a second phase current flows, and a third coil through which a third phase current flows, said first coil, said second coil, and said third coil are each wound around a bundle of adjacent core units, and said first coil, said second coil, and said third coil are offset in this order by ⅓ pole pitch in the rotor rotating direction, said coils being placed only within a range defined by second virtual planes, said second virtual planes being specified respectively by rotating a first virtual plane according to a predetermined angle in a rotor rotating direction and a direction opposite thereto, said first virtual plane being a plane passing through the axial center of said rotor, inner surfaces of an adjacent 3N (N=1, 2, 3, . . . ) number of core units of said a plurality of said core units being delimited within a width of one pole on said outer surface of said rotor.