The Control System Of Shaftless Drives Based On CAN Bus

Shaftless driven system involves interdisciplinary integrated technology, which spans domains within mechanical engineering, control theory, communication theory and transmission technology. Due to its open architecture, high synchrony, high flexibility, low cost and remote controllability,Shaftless driven technology provides a novel solution for the conventional transmission system of printing equipment.In this paper, the new advances in shaftless driven system in worldwide are investigated, compared and further analyzed. Then a shaftless driven system is designed for large printing equipments by means of CAN communication and synchronized control of electric motors. CAN communication is chosen because of its outstanding advantages such as long-range communication capability, real time performance, high reliability and resiliency against error. The designed system is composed of a server and several control units. The server is constituted by a computer and a CAN232 interface card, which aims for CAN communication, human-computer interaction, real time electric motor parameter sampling and plotting. The Silabs C8051F040 high perform micro controller is used as the core of the control units, which is capable of electric motor driven, speed detection and CAN communication. The whole system can accomplish the synchronized control of multiple electric motors, CAN communication between control units and the server, as well as a global control of control units.Experiments illustrate that the electric motors operate smoothly with a desirable control performance. The basic functions of the system are implemented flawlessly. Moreover, the human computer interface is user-friendly and enables real time observation of the states of electric motors.