在一些需要搅拌的行业，使用变频器的电动机越来越多。它变速灵活、控制方便。但是，在许多场合搅拌过程中需要不断加进粉料，这样导致粘度增加，使得电动机电流升高，最后引起变频器过载保护电路动作，直接影响生产。笔者在变频器的输出端增加了一个小电路，不需工作电源，很 In some industries that require mixing, more and more motors use frequency converters. It is flexible and easy to control. However, in many occasions, it is necessary to continuously add powder during the stirring process, which leads to the increase of viscosity and the increase of the motor current, finally causing the inverter overload protection circuit to operate and directly affect the production. The author adds a small circuit in the output of the inverter, without working power, very