بهینه‌سازی طراحی، بهبود کیفیت ولتاژ و نوسانات گشتاور یک ژنراتور آهنربای دائم سطحی با رتور خارجی به‌منظور کاربرد در توربین‌های‌ بادی بدون جعبه‌دنده

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