该程序为三相半控整流桥控制电机转动,三相交流电经晶闸管组成的半控整流电路，通过电感滤波，驱动直流电机转动，可观察电机转速。-The program for the three-phase half-controlled rectifier bridge control motor rotation, three-phase AC by thyristor half-controlled rectifier, filtering through the inductor to drive DC motor rotation, motor speed can be observed.