| 摘要 |
PROBLEM TO BE SOLVED: To provide a three-phase alternator, capable of materializing ripple reduction on a generated voltage and the improvement of the output current in the medium and high-speed range, while suppressing the deterioration of low-speed start-up property of the generated voltage. SOLUTION: An armature coil (Y-Δparallel connection for armature coil) consists of a Y-connection armature coil and aΔ-connection armature coil which are wound in the same slot of an armature core and are connected in parallel with each other. Here, the number of turns of theΔ-connection armature coil is set to the integer value one or two turns less than the integral value coming closest to 1.73 times the number of turns of the Y-connection armature coils and furthermore is larger than the number of turns of the U-connection armature coil. By doing so, the output current property in middle and high-speed range can be improved, while suppressing the deterioration in the ripple factor and the low-speed start-up property of the voltage generated.
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