為求直接驅動負載時能獲得暫態響應快及運轉平順的優勢，故反電動勢波形設計為弦波，並且將動子線圈進行有效排列，縮小佔用空間。
In order to obtain advantages of quick transient response and smooth operation when drive load directly, back-EMF wave is designed as sine wave. Moving coil is arranged effectively to reduct space occupied.
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