Design of electronic letoff control system of highspeed warp knitting machine

TIAN Ningbo, YUAN Yanhong, ZHANG Jianyi, JIN Li
(Modern Textile Equipment and Technology Engineering Research Center of
Ministry of Education, Zhejiang SciTech University, Hangzhou 310018, China)

Abstract: In order to ensure warp knitting machine sent stably in the highspeed cases, the most common principle of constructing closedloop system today was applied to achieve the task of feedback controlling on the condition of same amount of warp runin and constant linear velocity. A kind of electronic warp letoff system based on advanced RISC machines(ARM) and fieldprogrammable gate array(FPGA)controlled was established. And the PID control theory was used. The results indicate that the system can achieve the goal of warp knitting machine stably working in the high speed cases.
Key words: warp knitting machine; electronic warp letoff system; advanced RISC machine(ARM); fieldprogrammable gate array(FPGA); proportimintegrationdifferentiation(PID)