Abstract:

In view of the characteristics of intelligent contactor required by the new era,the dynamic and real-time digital regulation of contactor coil current is realized by applying PWM signal control switch tube and current closed-loop control scheme.The electromagnetic mechanism works in different working states such as suction,holding,fast breaking,etc.The system principle,system structure and hardware and software realization of the intelligent control module are introduced respectively.The prototype was designed and made for verification test,and all functional parameters of the original design were achieved.

Key words: intelligent contactor, PWM signal, current closed-loop control, intelligent module