[Means for Resolution] A winding structure which is disposed over an armature and a commutator is provided. The winding structure includes an equalizer. The equalizer includes a going portion and a return portion which are wound across one group of teeth through a slot and connect between two identical segments. In a case where the number which becomes the integer is given as the expansion value among values which are integer multiples of the value which is acquired by dividing the number of the slots by the number of pole pairs, when one group of the teeth having the same number as the expansion value is given as an element teeth group, the going portion and the return portion are wound across the element teeth group through the slots positioned at both sides of the element teeth group.
