應用於閥門控制，必須搭配特殊機構操作，並旋轉在特定角度內，應用空間小故採高功率密度設計，並使用特殊超高導磁材料。
Apply to valve control and should be operated with special mechanism to be rotated in s specific angle. High power density design is used due to small application space. Special high magnetic conduction material is used.
About the author