7DO435.7---7DO435.7

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平方转距负载
　　在各种风机、水泵、油泵中，随叶轮的转动，空气或液体在一定的速度范围内所产生的阻力大致与速度n的2次方成正比。随着转速的减小，转矩按转速的2 次方减小。这种负载所需的功率与速度的3 次方成正比。当所需风量、流量减小时，利用变频器通过调速的方式来调节风量、流量，可以大幅度地节约电能。由于高速时所需功率随转速增长过快，与速度的三次方成正比，所以通常不应使风机、泵类负载超工频运行。

厨师薛乐和齐彬：

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