Armature, method for winding armature coil, and DC motor

1. An armature comprising:

an armature core;

a plurality of teeth provided so as to be arranged in a circumferential direction of the armature core, each of the teeth including an inner winding portion located on a base end side and extending in a radial direction and a first branch portion and a second branch portion branching from a distal end of the inner winding portion in a bifurcated manner in the circumferential direction and extending in the radial direction;

a commutator integrally rotated with the armature core, the commutator having segments in the number twice of the number of the teeth arranged in the circumferential direction and each of the segments having a riser;

a plurality of concentrated winding wires, each of the concentrated winding wires being formed of a conductor wound around each of the inner winding portions of the teeth; and

a plurality of distributed winding wires, each of the distributed winding wires being formed of the conductor wound between the first branch portion of one of the adjacent teeth and the second branch portion of another of the teeth, wherein

each of the concentrated winding wires is wound such that a start end and a terminal end thereof are pulled out separately in a direction getting closer to the commutator and in a direction away from the commutator;

the conductor between the concentrated winding wires is hooked by the riser by which the conductor between the other concentrated winding wires is not hooked;

each of the distributed winding wires is wound such that a start end and a terminal end thereof are pulled out separately in a direction getting closer to the commutator and in a direction away from the commutator; and

the conductor between the distributed winding wires is hooked by the riser by which at least one of the conductor between the concentrated winding wires and the conductor between the other distributed winding wires is not hooked.

2. A winding-wire winding method of an armature including:

an armature core;

a plurality of teeth provided so as to be arranged in a circumferential direction of the armature core, each of the teeth including an inner winding portion located on a base end side and extending in a radial direction and a first branch portion and a second branch portion branching from a distal end of the inner winding portion in a bifurcated manner in the circumferential direction and extending in the radial direction;

a commutator integrally rotated with the armature core, the commutator having segments in the number twice of the number of the teeth arranged in the circumferential direction and each of the segments having a riser;

a plurality of concentrated winding wires, each of the concentrated winding wires being formed of a conductor wound around each of the inner winding portions of the teeth; and

a plurality of distributed winding wires, each of the distributed winding wires being formed of the conductor wound between the first branch portion of one of the adjacent teeth and the second branch portion of another of the teeth, comprising:

winding the plurality of concentrated winding wires by two winding machines relatively arranged so as to face each other by 180°, each of the two winding machines winding a half of the plurality of concentrated winding wires; and

after winding the concentrated winding wires, winding the plurality of distributed winding wires by the two winding machines, each of the two winding machines winding a half of the plurality of distributed winding wires, wherein

each of the concentrated winding wires is wound such that a start end and a terminal end thereof are pulled out separately in a direction getting closer to the commutator and in a direction away from the commutator;

the conductor between the concentrated winding wires is hooked by the riser by which the conductor between the other concentrated winding wires is not hooked;

each of the distributed winding wires is wound such that a start end and a terminal end thereof is pulled out separately in a direction getting closer to the commutator and in a direction away from the commutator; and

the conductor between the distributed winding wires is hooked by the riser by which at least one of the conductor between the concentrated winding wires and the conductor between the other distributed winding wires is not hooked.

3. The winding-wire winding method of an armature according to claim 2 , wherein

a half of the plurality of concentrated winding wires is continuously wound;

after the conductor between the concentrated winding wires determined in advance is hooked by the riser, the subsequent concentrated winding wire is wound;

a half of the plurality of distributed winding wires is continuously wound;

after the conductor between the distributed winding wires determined in advance is hooked by the riser, the subsequent distributed winding wire is wound;

the winding-wire winding method of an armature further comprises:

cutting off and removing an unnecessary portion of conductor located between the concentrated winding wires after the concentrated winding wires are wound; and

cutting off and removing the unnecessary portion of conductor located between the distributed winding wires after the distributed winding wires are wound.

4. The winding-wire winding method of an armature according to claim 3 , wherein

the conductor is routed so that both side portions of the unnecessary portion of conductor located between the concentrated winding wires are arranged on an outermost periphery of the concentrated winding wire wound in a preceding process, respectively;

both ends of the unnecessary portion of conductor close to the commutator are cut off and the unnecessary portion of conductor is pulled out in a direction away from the commutator;

the conductor is routed so that both side portions of the unnecessary portion of conductor located between the distributed winding wires are arranged on an outermost periphery of the distributed winding wire wound in the preceding process, respectively; and

both the ends of the unnecessary portion of conductor close to the commutator are cut off and the unnecessary portion of conductor is pulled out in the direction away from the commutator.

5. The winding-wire winding method of an armature according to claim 3 , wherein

both side portions of the unnecessary portion of conductor located between the concentrated winding wires are embedded inside in the radial direction in the concentrated winding wire wound in a subsequent process, respectively;

both ends far from the commutator of the unnecessary portion of conductor are cut off with both the side portions embedded in the concentrated winding wire and the unnecessary portion of conductor is removed;

both the side portions of the unnecessary portion of conductor located between the distributed winding wires are embedded inside in the radial direction in the distributed winding wire wound in the subsequent process, respectively; and

both the ends far from the commutator of the unnecessary portion of conductor are cut off with both the side portions embedded in the distributed winding wire and the unnecessary portion of conductor is removed.

6. A DC motor having the armature produced by the winding-wire winding method of an armature according to claim 2 .

7. A winding-wire winding method of an armature including:

an armature core;

a plurality of teeth provided so as to be arranged in a circumferential direction of the armature core, each of the teeth including an inner winding portion located on a base end side and extending in a radial direction and a first branch portion and a second branch portion branching from a distal end of the inner winding portion in a bifurcated manner in the circumferential direction and extending in the radial direction;

a commutator integrally rotated with the armature core, the commutator having segments in the number twice of the number of the teeth arranged in the circumferential direction and each of the segments having a riser;

a plurality of concentrated winding wires, each of the concentrated winding wires being formed of a conductor wound around each of the inner winding portions of the teeth; and

a plurality of distributed winding wires, each of the distributed winding wires being formed of the conductor wound between the first branch portion of one of the adjacent teeth and the second branch portion of another of the teeth, comprising:

winding the plurality of concentrated winding wires by two winding machines relatively arranged so as to face each other by 180°; and

winding the plurality of distributed winding wires by the two winding machines after the concentrated winding wires are wound, wherein

each of the concentrated winding wires is wound by the two winding machines so that the number of turns of each of the concentrated winding wires is shared;

the conductor between the concentrated winding wires is hooked by the riser by which the conductor between the other distributed winding wires is not hooked;

each of the distributed winding wires is wound by the two winding machines so that the number of turns of each of the distributed winding wires is shared; and

the conductor between the distributed winding wires is hooked by the riser by which at least one of the conductor between the concentrated winding wires and the conductor between the other distributed winding wires is not hooked.

8. A DC motor having the armature produced by the winding-wire winding method of an armature according to claim 7 .

9. A winding-wire winding method of an armature including:

a plurality of segments grouped into a plurality of sets, each set including the plurality of segments, and each of the segments having a riser;

a plurality of short-circuit wires, each of the short-circuit wires being configured such that the plurality of segments are electrically conducted to equalize in potential the plurality of segments in each set, each of the short-circuit wires including a start end portion, a terminal end portion, and a non-end portion located between the start end portion and the terminal end portion, and the non-end portion is hooked by the riser of segment in the same set as the segment to which the start end portion is connected and the segment to which the terminal end portion is connected but different from them, comprising:

connecting the start end portion and the terminal end portion of each of the short-circuit wires to the segment in the same set as the segment by which the non-end portion is hooked so that the non-end portion of each of the short-circuit wires is not adjacent with the non-end portion of another short-circuit wire in a circumferential direction;

bending the riser of the segment in the segments of each set excluding the riser of the segment by which the non-end portion is hooked in a direction in which the start end portion and the terminal end portion of the short-circuit wire can be held; and

winding the winding wire by using the riser by which the non-end portion is hooked and which is not bent.

10. The winding-wire winding method of an armature according to claim 9 , wherein

after the riser is bent or after the riser and the start end portion and the terminal end portion of the short-circuit wire are joined by fusing, the winding wire is wound.

11. The winding-wire winding method of an armature according to claim 9 , further comprising:

joining the riser by which the non-end portion is hooked and that is used for winding of the winding wire, the non-end portion of the short-circuit wire, and a winding end portion of the winding wire by fusing after the winding wire is wound.

12. A DC motor having the armature produced by the winding-wire winding method of an armature according to claim 9 .