| 摘要 |
An automotive alternator is disclosed which includes an annular core disposed to surround the radially outer peripheries of all magnetic pole claws of magnetic pole cores. The annular core has, on an outer surface thereof, a plurality of protrusions, a plurality of recesses, and a plurality of slopes. Each of the protrusions is so provided as to be coincident with a corresponding one of the magnetic pole claws of the magnetic pole cores in the circumferential direction of a rotary shaft. Each of the recesses is alternately formed with the protrusions so as to be coincident with a corresponding one of air gaps formed between the magnetic pole claws of the magnetic pole cores in the circumferential direction. Each of the slopes is inclined to the radial direction of the rotary shaft and connects a circumferentially adjacent pair of one of the protrusions and one of the recesses.
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