这使得电机的设计自由度大，难度高。
This makes the design of motor high in free degree and high in difficulty.
减少能耗，节约建筑面积，提高设计自由度。
It cuts down the energy loss, saves the construction area and enhances the design freedom.
本文提出了一种新的设计自由度——变截面通道设计方法。
This paper presents the design of a new degree of freedom-channel with variable cross-section design.
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