三菱A700系列变频器的设计与应用 第4讲 化学品电机的变频控制

AC Inverter Control for the Chemical Motor

化学品电机由于其环境恶劣、负载重,经常会出现电机过热保护和起动转矩不够的情况,因此有必要对于在V/f控制方式下的变频器实行手动转矩提升和外部热继电器输入等。电动机在低频时对应输出的电压较低,转矩受定子电阻压降的影响比较显著,这就导致励磁不足而使电动机不能获得足够的旋转力,因此需要对转矩进行补充补偿,这称为转矩补偿。本文充分利用三菱A700变频器强大的V/f控制功能,实现了化学品电机的多种工艺功能。

Due to poor conditions and heavy load, the chemical motors often occur motor overheat or lack enough torque to launch. So it is necessary to use manual torque and external thermal relay input in case of V / f control mode. The motor at low frequencies corresponds to low output voltage. The torque is sensitive to voltage drop of the stator resistance, which leads to the shortages at the motor excitation and rotational force. Therefore additional compensation for torque is needed which is called the torque compensation. This paper uses the powerful Mitsubishi A700 inverter V / f control to achieve a variety of the chemical motor processing.