Research On Electronic Line Shafting-based Synchronization Technology And Its Applications

High-precision synchronization control technology is the coretechnology of shaftless drives, it has drawn great public interest and beena key problem to be shoveled in engineering application of shaftlessdrives. Electronic line shafting (ELS) is the most popular control strategyfor systems with shaftless drives. Factors such as nonlinearity, unknowndisturbance, etc., however, have greatly limited the high precisionsynchronization of such systems. Therefore, the research on ELS controlstrategy has practical significance.This paper takes the shaftless drive system as the project background,and takes the printing machines with shaftless drives as the researchobject. A deep investigation is done in this paper on improve the trackingperformance and the multi-axis synchronization coordinationperformance. The major contents and conclusions can be summarized asfollows:The features and existing problems in traditional synchronizationcontrol strategies are analized and compared after an in-depth survey ofcurrent technological development. It is proposed that ELS controlstrategy is the most popular control strategy for printing machines withshaftless drives and it is effective to sovel the application problems insynchronization control technology.A sliding mode controller for tracking control is designed in thisstudy. This controller can eliminate the negative effects on registerprecision resulting from the friction present in the pre-registration step ofa printing machine with shaftless drive at low speed. Moreover, it caneliminate the effects of the printing process on synchronization precisionresulting from nolinearities and load disturbances. The design ofcontroller has improved the tracking performance.For traditional ELS control strategy based on conventional PIDcontrol algorithm, robustness to disturbances and parameter variations islow, and speed regulation and positioning are not satisfactory. The controlstrategy of sliding mode variable structure-based electronic line shafting is designed, which improved the synchronization performance.In contrast to the constant deviation among axes resulting from thetime delay of the torque feedbacks in the traditional ELS control strategy,an improved ELS control strategy based on load observer is proposed inthis paper, to eliminate the constant deviation among axes. Experimentalresults have demonstrated the effectiveness of the control strategyproposed in this paper.