Patent ID: 7084547

Claim:
A motor for a fuel pump, comprising: a permanent magnet formed from a plurality of magnetically differing poles disposed in an alternating and circumferential fashion; an armature rotatingly disposed within an inner circumference of the permanent magnet, the armature having coils wound thereabout; and a commutator comprising a plurality of segments disposed in a direction of rotation and electrically connected to the coils wound around the armature, the segments mutually adjacent in the direction of rotation and being mutually insulated; a brush successively contacting each of the segments due to rotation of the armature; and a capacitor electrically connected to a circuit including the commutator and the armature, wherein the capacitor stores electromagnetic energy released by the coils during rotation of the armature to prevent occurrence of discharge between the brush and the segments, wherein the commutator and the armature comprise a rotating member, wherein the capacitor is disposed inside the rotating member so as not to be disposed on a peripheral surface of the rotating member, and wherein a recessed portion is formed between adjacent coils in the armature and between the coils and the commutator in an axial direction of the armature, and the capacitor is disposed so as to project on a side of the commutator nearest the armature and is disposed in a position corresponding to the recessed portion, whereby an axial length of the motor can be shortened.