Vane axial fan with optional fan pitch control.
具有可选风扇节距控制的翼式轴流风扇。
The pump having the Angle adjustable vane is called the variable pitch vane type, and having the non-adjustable vane is called the fixed vane type.
循环水泵可分为拥有叶片角度调节装置的可调叶片式，和叶片不可调节的固定叶片式。
The influence of control method for pitch on power flowing and rotating speed of the vane are focused.
重点阐释了风力发电机变桨矩控制方法对风力发电机组的功率流动、叶轮转速变化的影响。
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