| In many industrial occasions, synchronous control for multiaxis has been used more and more widely, the reliability and control accuracy of synchronous control for multiaxis affect production efficiency and quality of products, traditionary synchronous control for multiaxis is realized in the way of rigid connection by line shaft. Although this way has good synchronism, it has complex driven system, management difficult, poor flexibility, it can't meet the requirements of modern production. In recent years, synchronous control for multiaxis in the way of electric replaces the synchronization by machinery line shaft with the development of motion control technology. Synchronous control system for multiaxis based on electric method has high-accuracy, good dynamic performance, various control modes, which bright greater flexibility to the machine design.Multi-functional envelope machine is a combined mechanical equipment comprised of several functional units, manufacture of envelope depends on the synchronized motion of units. every unit has drive shaft, the shaft is drived by a servo motor. This thesis designs the electric control system of envelope machine based on synchronous control for multiaxis on the background of gearing reconstruction of envelope machine.Firstly, analyse the theory and characteristic of synchronous control system of envelope machine primarily and design synchronous control system for multimotors with core of SIEMENS CPU314C-2DP PLC and MECAPION AC servo system with the structure of One-master and Multi-Slaves. The speed of master motor is set by the touch screen, PLC calculates the speed command value of the slave motors according to the encoder's output signal of master motor and make the slave motor run following master motor by converting this value to pulse at a certain frequency so as to realize synchronous control for multi-motors. Secondly, analyse several factors which affect the system synchronous performance and put up a method of speed adjustment based on fuzzy PID, PLC detects the speed of master motor and each slave motor by FM350-1 high-speed counter modules and calculates the speed error and rate of error change, then fuzzy controller adjust the parameters of PID controller and make system can adjust the speed of slave motors to follow the speed of master motor quickly and accurately.,so as to eliminate the synchronization error and improve dynamic performance as well as static accuracy. Finally, construct control network of multi-driver based on PROFIBUS fieldbus, PLC can read the state parameters of each driver instantly and modify the relevant parameters by upper computer.This system has good synchronous performance, strong antijamming capability and easy adjustment in structure proved by fieldassemble, it can satisfy production requirement. |
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