Patent ID: 8080916

Claim:
A direct current motor comprising a yoke housing, a permanent magnet that is fixed to the inner circumferential surface of the yoke housing with the number of magnetic poles being six, and an armature that is supported on the inner side of the permanent magnet in a freely rotatable manner, wherein the armature comprises a rotating shaft that is supported by the yoke housing, an armature core that is fitted and fixed to the rotating shaft from an outer side of the rotating shaft, and a commutator that is provided on the rotating shaft adjacent to the armature core with nine segments arranged in the circumferential direction; the armature core has nine teeth that extend in the radial direction in a radial pattern and nine slots that are formed between the teeth and extend in the axial direction; the segments having the same polarity are connected with a short-circuiting member; an armature coil provided to the teeth comprises three sets of three coils, with each set including a first coil, a second coil and a third coil connected in series and arranged at an interval of 120° in the circumferential direction with respect to each other; and a pair of brushes that make sliding contact with the segments is disposed so as to be mutually point symmetric centered on the rotating shaft.