Patent ID: 6756717
Filing Date: 2004-06-29
Classification: H02K

Abstract:
A motor comprising:a stator having a plurality of magnetic poles, wherein the number of the magnetic poles is represented by 2x (x is an integer number greater than or equal to one), and wherein the magnetic poles are arranged along the circumferential direction of the stator; a rotor facing the magnetic poles, wherein the rotor includes: an armature core having a plurality of teeth, wherein the number of the teeth is represented by 2y (y is an integer number greater than or equal to three), and wherein a coil is wound about each tooth; a commutator having a plurality of segments, wherein the number of the segments is represented by 2xy, and wherein the segments are arranged along the circumferential direction of the commutator; and a plurality of short-circuit members, wherein each short-circuit member is connected to a predetermined number of the segments, wherein the number of the segments that are connected to one short-circuit member is B, and wherein the number of the short-circuit members is at least 2xy/B; and an anode supply brush and a cathode supply brush, wherein the supply brushes slide against the commutator, and wherein the supply brushes are arranged at a predetermined angular interval about the axis of the commutator, wherein each short-circuit member extends in an arcuate form in an angular range corresponding to the arranging positions of the segments to be connected to the short-circuit member, and wherein the short-circuit members are laminated to form a multi-layer structure in the axial direction of the commutator, and form a substantially cylindrical laminated body, and wherein the short-circuit members are formed and arranged such that at least parts of two or more of the short-circuit members are in the same layer of the laminated body so that the number of layers of the laminated body is less than the number of short-circuit members.