Patent ID: 9608487
Date: 2017-03-28
CPC Classifications: H02K

Claim:
1. An electric motor comprising: a rotating shaft rotatably supported by a yoke; an armature core attached to the rotating shaft and including a plurality of teeth extending radially to be in a diameter direction and a plurality of slots formed between these teeth; a winding wire wound between the slots; and a commutator adjacent to the armature core in the rotating shaft and including a plurality of segments to which the winding wire is connected, wherein, when a predetermined number of turns of the winding wire between the slots is N, A is an integer equal to or more than 0, and α is set to satisfy α=0.5 A, the winding wire includes a first coil including a first small coil and a second small coil, and a second coil including a third small coil and a fourth small coil, the first small coil is formed by the winding wire being wound N/2+α times between two predetermined slots, the second small coil is formed by the winding wire being wound N/2−α times between two other slots present in positions which are point-symmetrical to the two predetermined slots with respect to the rotating shaft, the third small coil is formed by the winding wire being wound N/2+α times between the two other slots which are the same as those between which the second small coil is formed, and the fourth small coil is formed by the winding wire being wound N/2−α times between the two predetermined slots which are the same as those between which the first small coil is formed.