西门子6SL3353-3AE41-1CA0

6SL3353-3AE41-1CA0

大家知道，对一个特定的电机来说，其额定电压和额定电流是不变的。 如变频器和电机额定值都是：15kW/380V/30A，电机可以工作在50Hz以上。 

当转速为50Hz时，变频器的输出电压为380V，电流为30A。这时如果增大输出频率到60Hz，变频器的大输出电压电流还只能为380V/30A，很显然输出功率不变. 所以我们称之为恒功率调速。

这时的转矩情况怎样呢?  因为P=wT (w：角速度, T：转矩)。因为P不变, w增加了, 所以转矩会相应减小。 

我们还可以再换一个角度来看：电机的定子电压 U = E + I*R (I为电流，R为电子电阻, E为感应电势)  可以看出，U、I不变时，E也不变。而E = k*f*X, (k:常数, f: 频率, X:磁通)，所以当f由50-->60Hz时, X会相应减小  

对于电机来说，T=K*I*X(K：常数， I：电流，X：磁通)，因此转矩T会跟着磁通X减小而减小。同时, 小于50Hz时，由于I*R很小，所以U/f=E/f不变时，磁通(X)为常数，转矩T和电流成正比。这也就是为什么通常用变频器的过流能力来描述其过载(转矩)能力。并称为恒转矩调速(额定电流不变-->大转矩不变)  

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