Abstract: This paper has proposed a drive theory for high-speed magnetic suspended knitting needles based on the magnetic suspension theory by means of imposing electromagnetic force directly on the knitting needles. The feasibility of the principles for suspended-driven needle selection of circular knitting machine has been discussed. We propose a basic structure of magnetic suspension needle for method of suspended-driven needle, and obtain the thermal motion results of needle by analysis of magnetic circuit of needle devices and needle friction heat. Finally, the control model of the needle displacement detection has been studied, introducing the ceramics as insulating materials of displacement sensor in dynamic needle, and the means of sensor pole coating. The study provides the suspended driven theory for further study and the reliable theoretical foundation for achievement of needle driven in small space.

Key words: electronic meedle selection, magnetic suspension propulsion, needle structure, jacquard circular knitting machine, theumal analysis