| 摘要 |
An automotive alternator which can realize high output and efficiency, and in which noise may be reduced includes: a polyphase stator winding 16 comprising a number of winding portions in which long wire strands 30 are wound so as to alternately occupy an inner layer and an outer layer in a slot 15a depth direction within the slots 15a at intervals of a predetermined number of slots 15a, the wire strands 30 folding back outside the slots 15a at axial end surfaces of a stator core 15 to form turn portions 30a; the turn portions 30a of the wire strands 30 being roughly the same shape and aligning at roughly the same pitch in a circumferential direction to constitute coil end groups 16a, 16b; the coil end groups 16a, 16b being disposed in a plurality of rows in the radial direction; fans 5 being provided at axial end portions of a rotor 7 roughly facing the coil end groups 16a, 16b and generating cooling air D flowing in a radial direction to ventilate the coil end groups 16a, 16b.
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