| 摘要 |
A rotary electric machine includes a stacked brush, where low-resistance and high-resistance brush layers are disposed at the front and rear end sides in the rotational direction of a commutator, respectively. When the insulation gap between the neighboring segments of a commutator is "a" and the width of the high-resistance brush layer is "b", "a" and "b" are determined to satisfy a<b and b/a<4 to reduce sparks and improve commutation property. In order to reduce spark generation at the brush front end, especially, when the circumferential width of the segment is "c" and the width of the low-resistance brush layer is "d", "a" to "d" are determined to satisfy b+d>2xa+c, d>b, a<b and d<a+c.
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