本文分析了风机负荷与不同调速方式的运行特性，并提出合理的风机调速方式。
The fan load and operation characteristics of various speed regulation technique method for fan is put forward.
与风机负荷的波动相关，风机转子的角速度变化及相伴的低频拍振是不可避免的。
Because of oscillation of the blower load the variation of angular velocity of the blower rotor and beats in lower frequency are inevitable.
在不同负荷、不同季节和不同环境温度下，制冷机组的冷却塔风机恒速运行无法使冷却水温度控制在需要范围内。
The temperature of cooled water could not be maintained in a desired range by a fan running at constant-speed in a cooling tower under different loads and environmental temperatures.
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