Patent ID: 8618711

Claim:
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 â…“ 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.