Scheme analysis of high precision servo forging press with double motor synchronization control

CHEN Jing1， CHEN Bing-bing1， HUANG Wei-quan1， LONG Jing1，2
(1. Foshan ShunDe Industry and Information Technology Research Center Co.，Ltd.， Foshan 528300， China；
2. School of Mechanical and Electrical Engineering， Guangzhou University， Guangzhou 510006， China)

Abstract： Aiming at the bottleneck problems of motor accurate synchronization existing in the new servo forging press machines，the scheme of dual motor cross coupling control was presented. The current of master-salve motor was compared in the scheme，and then a different value as an additional feedback signal of the motor was acquired.Based on the attached feedback signal，the motor dynamically adjusts the speed so that a better synchronization precision could be obtained.A comparison and analysis about control effect and existing problems between the scheme of the master-slave double motor synchronization control scheme and the scheme of cross coupling double motor synchronization control was firstly made from the perspective of theory. Then master-slave double motor synchronization control scheme and the cross coupling double motor synchronization control scheme were separately used to control forging machine so that the same process curve could be implemented， and then the comparison and analysis between synchronization errors and coupling torque curve was made under the experiments. The results indicate that the scheme of double motor differential current coupling synchronization control could meet the position and torque requirements of the system in a tightly coupled dual motor system，and two synchronous errors are within 0.35 degrees.
Key words： forging machine； cross coupling control； synchronization