介绍了改造前桥式起重机的控制原理,分析了其无法克服的不同步的原因,用变频器、编码器对控制回路进行成功改造后,实现了速度闭环控制,解决了桥式起重机起吊双沟动作不同步问题。 This paper introduces the control principle of the overhead traveling crane before modification, analyzes the unsynchronized reason which it can not overcome. After the inverter and encoder are successfully transformed into the control loop, the speed closed-loop control is realized, which solves the problem of double- Action is not synchronized issue.