| 摘要 |
PROBLEM TO BE SOLVED: To improve cooling performing of an IC regulator without damaging cooling performance of the other components, in a limited space. SOLUTION: Cooling fins 511, 512 holding rectifying elements 513, 514 form an approximate C-shape having a notch 52 in a part of an annulus. A connector case 8 and a brush holder 6 ate arranged in the notch 52. The IC regulator 7 is arranged between the connector case 8 or the brush holder 6 and a rear cover 92. A radiating metal plate of the IC regulator 7 faces a ventilating hole arranged on the rear cover 92. Since the radiating metal plate of the IC regulator 7 is arranged facing the ventilating hole arranged on the rear cover 92 and the effect of radiation heat of the cooling fins 511, 512 and the brush holder 6 is little, the ambient temperature of the IC regulator 7 during power generation is low, and the cooling performance of the IC regulator 7 can be improved. |
