Direct-current motor

A direct-current motor comprising:

• a core including a plurality of teeth arranged in a circular disposition and defining a plurality of slots, the teeth having distal ends and coil-winding sections respectively;
• slot insulating members disposed to cover outer peripheries of the teeth respectively;
• coils wound on the coil-winding sections of the teeth with the slot insulating members being interposed therebetween, respectively;
• and
• pole sections, each pole section provided at a distal end side of a corresponding tooth and is circumferentially wider than a corresponding coil-winding sections;
• wherein the teeth include first teeth having wider pole sections respectively and second teeth having pole sections narrower than the first teeth;
• and
• wherein the slot insulating members have notches in portions thereof located at circumferential corners of the pole sections of the first teeth respectively.