Patent ID: 9252636
Filing Date: 2016-02-02
CPC Classification: H02K,Y10T

Claim Text:
1. An armature comprising: an armature core including 3n teeth, wherein “n” is an odd number greater than or equal to 3, and arranged in a circumferential direction, wherein each of the 3n teeth includes an inner winding portion, which extends radially in a proximal region of each of the corresponding tooth, and first and second branch portions, which extend radially and branch off in a bifurcated manner from a distal end of the inner winding portion in the circumferential direction; 6n armature coils including 3n concentrated coils and 3n distributed coils, wherein the 3n concentrated coils are respectively wound around the inner winding portions of the teeth, the 3n distributed coils are respectively wound around outer winding portions of adjacent ones of the teeth, and each of the outer winding portions includes the first branch portion of one of the adjacent teeth and the second branch portion of the other one of the adjacent teeth; and a commutator including 6n commutator pieces arranged in the circumferential direction, wherein the commutator is integrally rotatable with the armature core, wherein the 3n concentrated coils include the 3n distributed coils include each of the second distributed coils is arranged between adjacent ones of the first concentrated coils and the third concentrated coils in the circumferential direction, and the first to third concentrated coil groups are sequentially connected, and the first to third distributed coil groups are sequentially connected, an initiating end of the first distributed coil group is connected to a terminating end of the third concentrated coil group, and a terminating end of the third distributed coil group is connected to an initiating end of the first concentrated coil group, each of the coil groups is connected to another one of the coil groups by a group of n commutator pieces arranged at equal angular intervals of 360/n, and the n commutator pieces of each group are respectively adjacent to n commutator pieces of another group used to connect the subsequent coil groups.