Design Of Multi-Axis Synchronization Systems Based On Virtual Line-shaft Control

With the development of technology, motion control is done by direct-drive motor instead of machines with complex structure. Multi-motor synchronous control is more and more used in all kinds of fields, especially in the large-scale equipment with multi-decentralized operating mechanism.Multi-motors must be operated synchronously and coordinately according to a certain proportion, in order to keep the production process normal. What's more, the synchronization of the system directly affects the quality and performance of product. Therefore, doing research on multi-axis synchronization control and increasing its synchronization accuracy would be great significance of production.In this paper, for the actual demand, because the motion beam span in the large-format screen printing detection device is very large, which need multi-motor synchronous control to achieve the movement of the large-span beam on both sides by the synchronous drive, and the basic approach of the synchronization control involved in is studied systematically.To overcome the disadvantage of the common multi-motor synchronous control strategy, a new synchronous algorithm for control called the virtual line-shaft was used in this paper, and then the corresponding mathematical model of the multi-motor synchronous control was set up. It showed a good synchronization in the MATLAB simulation.In addition, to achieve the servo control of motor, a set of applicable motion controller is the key point. In this paper, a special motion control chip LM628 was selected as a core module in motion controller, and MCU was used as the main controller, which constituted the underlying single-axis servo controller, and completed the hardware circuit design of the various auxiliary function modules related to servo motor control. Meanwhile, the CAN bus technology was used in the whole control system, and a CAN bus interface card was designed to achieve the CAN protocol functions of physical layer and data link layer, which can ensure the control communication between the primary node-PC and that the second node-Single Servo motion modules in the entire control network.Finally, the author programmed all of the software modules in the synchronous motion control system involved in, and wrote the virtual line-shaft algorithm control procedures and the motion controller driver procedures, and other corresponding subroutine modules. The specific tests showed that the new design of the synchronous control system has good control synchronization performance, which can overcome a number of shortages of the multi-axis synchronized motion controller in the past, it has a great significance for the actual production.