| 摘要 |
PROBLEM TO BE SOLVED: To provide a rotary electric machine, a commutator, and a manufacturing method for commutators wherein collision between a step between commutator pieces and a brush is suppressed and noise can be reduced during operation. SOLUTION: An impact buffering portion 15 is formed at an end of a commutator piece 13. Thus, even when a brush is inclined due to friction between the brush and the commutator piece 13 and it breaks inside a virtual circle 100, impact force that causes vibration of the brush and the end of the commutator piece 13 and the like can be lessened. The impact buffering portion 15 is so formed that the outside face end of the commutator piece 13 is offset toward the inner radius side from the maximum break-in depth d, which is the maximum value of the depth to which the brush breaks inside the virtual circle 100. The cut-in depth of the impact buffering portion 15, which is the maximum distance of its cut-in from the virtual circle 100, is so set that it is smaller than the length of the impact buffering portion 15 in the circumferential direction. The angle of contact between the brush and the commutator piece 13 is thereby reduced. COPYRIGHT: (C)2006,JPO&NCIPI
|
