Short-circuit member for a commutator and an armature

A short-circuit member comprising a first conductor member group and a second conductor member group, each conductor member group including a plurality of conductor members that are arranged to form a circle, the number of the conductor members belonging to the first conductor member group and the number of the conductor members belonging to the second conductor member group being equal to each other and represented by n, which is an odd number;

• wherein each conductor member has an outer terminal located at an outer portion with respect to a radial direction of the corresponding conductor member group, an inner terminal located at an inner portion with respect to the radial direction of the corresponding conductor member group, and a coupling portion coupling the outer terminal and the inner terminal to each other, wherein the inner terminal of each conductor member is displaced from the outer terminal of the conductor member with respect to a circumferential direction of the corresponding conductor member group;
• wherein the first conductor member group and the second conductor member group are stacked on each other such that the direction in which the inner terminal is displaced from the outer terminal in each conductor member of the first conductor member group is opposite to the direction in which the inner terminal is displaced from the outer terminal in each conductor member of the second conductor member;
• wherein each inner terminal of the first conductor member group is aligned with a corresponding one of the inner terminals of the second conductor member group, and wherein each outer terminal of the first conductor member group is displaced from any of the outer terminals of the second conductor member with respect to the circumferential direction of the first conductor member group;
• and
• wherein, regarding each pair of a conductor member of the first conductor member group and a conductor member of the second conductor member group, of which the inner terminals are aligned with each other, the linear distance between the inner terminal and the outer terminal of one of the conductor members is equal to that of the other of the conductor members.

A commutator comprising:

• segments the number of which is represented by 2n, n being a positive integer;
• and a short-circuit member having a first conductor member group and a second conductor member group, each conductor member group including a plurality of conductor members that are arranged to form a circle, the number of the conductor members belonging to the first conductor member group and the number of the conductor members belonging to the second conductor member group being equal to each other and represented by n, which is an odd number;
• wherein each conductor member has an outer terminal located at an outer portion with respect to a radial direction of the corresponding conductor member group, an inner terminal located at an inner portion with respect to the radial direction of the corresponding conductor member group, and a coupling portion coupling the outer terminal and the inner terminal to each other, wherein the inner terminal of each conductor member is displaced from the outer terminal of the same conductor member by 90 degrees with respect to a circumferential direction of the corresponding conductor member group, wherein the outer terminal of each conductor member is connected to the corresponding one of the segments;
• wherein the first conductor member group and the second conductor member group are stacked on each other such that the direction in which the inner terminal is displaced from the outer terminal in each conductor member of the first conductor member group is opposite to the direction in which the inner terminal is displaced from the outer terminal in each conductor member of the second conductor member;
• and
• wherein each inner terminal of the first conductor member group is aligned with a corresponding one of the inner terminals of the second conductor member group, and wherein each outer terminal of the first conductor member group is displaced from any of the outer terminals of the second conductor member with respect to the circumferential direction of the first conductor member group.

An armature comprising:

• a rotary shaft;
• an armature core fixed about the rotary shaft, a coil being wound about the armature core;
• and
• a commutator that is fixed about the rotary shaft, segments of the commutator are electrically connected to the coil;
• wherein the commutator includes:
• said segments the number of which is represented by 2n, n being a positive integer, and
• a short-circuit member having a first conductor member group and a second conductor member group, each conductor member group including a plurality of conductor members that are arranged to form a circle, the number of the conductor members belonging to the first conductor member group and the number of the conductor members belonging to the second conductor member group being equal to each other and represented by n, which is an odd number,
• wherein each conductor member has an outer terminal located at an outer portion with respect to a radial direction of the corresponding conductor member group, an inner terminal located at an inner portion with respect to the radial direction of the corresponding conductor member group, and a coupling portion coupling the outer terminal and the inner terminal to each other,
• wherein the inner terminal of each conductor member is displaced from the outer terminal of the same conductor member by 90 degrees with respect, to a circumferential direction of the corresponding conductor member group, wherein the outer terminal of each conductor member is connected to the corresponding one of the segments,
• wherein the first conductor member group and the second conductor member group are stacked on each other such that the direction in which the inner terminal is displaced from the outer terminal in each conductor member of the first conductor member group is opposite to the direction in which the inner terminal is displaced from the outer terminal in each conductor member of the second conductor member, and
• wherein each inner terminal of the first conductor member group is aligned with a corresponding one of the inner terminals of the second conductor member group, and wherein each outer terminal of the first conductor member group is displaced from any of the outer terminals of the second conductor member with respect to the circumferential direction of the first conductor member group.