一、方案选择: 原设备的压下装置采用两台直流电动机,若采用速度、电流双闭环结构,当电动机单独工作时得需要两台测速机,结构比较麻烦,若用电压调节器代替速度调节器就比较简单,而且同样可以达到很好的调速效果,因此控制回路采用电压、电流双闭环调速系统结构,即凋节器的输出为电流调节器的给定。电压、电流双闭环调速系统图如图1 First, the program options: The original equipment depressor using two DC motors, if the use of speed, current double closed-loop structure, when the motor alone to work when you need two tachometer, the structure is too much trouble, if the voltage regulator instead of speed regulation The device is relatively simple, but also can achieve good speed control effect, so the control loop voltage and current dual closed-loop speed control system structure, that is, the output of the regulator for the current regulator given. Voltage and current double closed-loop speed control system shown in Figure 1