德国 31C450-503-4-00 变频器

德国 31C450-503-4-00 变频器 

(1）额定频率以上调速特性分析

在额定频率以上时，电压不允许继续增加，此时频率可以上升。具体上升幅度，与电机机械构件有关。

根据以上数学关系可以得出两点结论:

结论1:输出功率应与频率成反比，即功率将随着频率上升反比降低。

结论2:电机转矩将随频率的平方成反比而快速下降。

这个结论告诉我们，要在额定频率以上升速时，电动机和变频器都应该有较大的余量。

(1) Analysis of speed regulation characteristics above rated frequency

Above the rated frequency, the voltage is not allowed to continue to increase, and the frequency can be increased at this time. The specific rise is related to the mechanical components of the motor.

According to the above mathematical relationship, two conclusions can be drawn:

Conclusion 1: The output power should be inversely proportional to the frequency, that is, the power will decrease inversely as the frequency increases.

Conclusion 2: The motor torque decreases rapidly with the inverse proportion of the square of the frequency.

This conclusion tells us that to rise at the rated frequency, the motor and the inverter should have a large margin.