Electric motor having brushes and commutator of armature

A commutator for an armature comprising:

• a commutator body including a large diameter part, a small diameter part and a tapering protrusion part, the tapering protrusion part connecting between the large diameter part and the small diameter part;
• a plurality of segments disposed around an outer peripheral surface of the large diameter part;
• and
• a plurality of shorting wires extending along a surface of the tapering protrusion part between the large diameter part and the small diameter part and directly short-connecting the segments of same phase to each other.

An electric motor having power supply brushes comprising:

• a commutator having a plurality of segments disposed in a commutator ring;
• plural sets of power supply brushes held in sliding contact with the plurality of segments;
• and
• a plurality of shorting wires for electrically connecting same-phase segments of the plurality of segments,
• wherein the commutator comprises a commutator body including a large diameter part, a small diameter part and a tapering protrusion part, the tapering protrusion part connecting between the large diameter part and the small diameter part;
• wherein the plurality of segments are disposed around an outer peripheral surface of the large diameter part;
• and
• wherein the plurality of shorting wires extend along a surface of the tapering protrusion part between the large diameter part and the small diameter part and directly short-connect the same-phase segments to each other.