Journal of Textile Research ›› 2021, Vol. 42 ›› Issue (09): 156-162.doi: 10.13475/j.fzxb.20201008907

• Machinery & Accessories • Previous Articles     Next Articles

Influence of densely wound coil array structure on driving performance of suspended knitting needles

LI Dongdong1, ZHANG Chengjun1,2(), ZUO Xiaoyan1,2, ZHANG Chi1,2, ZHU Li1, LIU Yakun1   

  1. 1. School of Mechanical Engineering and Automation, Wuhan Textile University, Wuhan, Hubei 430073, China
    2. Hubei Key Laboratory of Digital Textile Equipment, Wuhan, Hubei 430073, China
  • Received:2020-10-30 Revised:2021-06-11 Online:2021-09-15 Published:2021-09-27
  • Contact: ZHANG Chengjun E-mail:zchengj_wuse@163.com

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Abstract:

In order to improve the driving performance of knitting needles, through the analysis of the densely wound coil array structure, the driving structure of the floating needle was determined, and the spatial magnetic field strength and the driving force of the floating needle were improved. According to Biot-Savart law, the electromagnetic model of the densely wound coil array structure was deduced, and the magnetic induction intensity of different densely wound coil structures and array methods at any position on the central axis was analyzed and calculated, which gain the electromagnetic field of the permanent magnet knitting needles under different air gaps and driving force. An electromagnetic simulation software was used to establish the driving model of the densely wound coil array structure, and the numerical curve of the electromagnetic driving force of the single and array type densely wound coil structure on the permanent magnetic needle were obtained. Using the constructed densely wound coil array driving experiment test platform, comparative analysis of simulation and experimental results were achieved, showing that the cylindrical densely wound coil has better driving performance in the permanent magnetic needle drive system, and the driving force generated by a single group of densely wound coils is greater than that of multiple groups.

Key words: suspended needle driven, permanent magnetic knitting needle, densely wound coil array, electromagnetic model, driving performance, flat knitting machine

CLC Number: 

  • TP311

Fig.1

Cylindrical densely wound coil driving structure. (a)One set of coil arrays;(b)Two set of coil arrays;(c)Three set of coil arrays;(d)Four set of coil of arrays"

Fig.2

Closely wound coils with different cross-sectional shapes. (a) Cylindrical; (b) Fusiform; (c) Spin double curves"

Tab.1

Parameters of simulation model for knitting needle drive"

类型 材料 形状 厚度/
mm		 半径/
mm		 线圈电流/
A		 磁动
势/AT
密绕
线圈		 铜 圆柱形 50 3 [0.7-1] 3 000
纺锤形 50 变化 [0.7-1] 3 000
双曲线形 50 变化 [0.7-1] 3 000
永磁 NdFe35 圆柱形 7 8 — —

Fig.3

Cylindrical densely wound coil of driving force with air gap height changing at different magnetomotive force"

Fig.4

Spin double curves densely wound coil relation chart of driving force with air gap height changing at different magnetomotive force"

Fig.5

Fusiform densely wound coil of driving force with air gap height changing at different magnetomotive force"

Tab.2

Relationship between array structure of densely wound coils of different cross-sections and the electromagnetic force"

截面形状 线圈阵列 不同磁动势下的驱动力/N
2 100 AT 2 400 AT 2 700 AT 3 000 AT
圆柱形 1组 0.120 0.135 0.140 0.140
2组 0.045 0.045 0.050 0.060
3组 0.035 0.035 0.035 0.035
4组 0.035 0.035 0.035 0.035
纺锤形 1组 0.035 0.060 0.060 0.060
2组 0.035 0.035 0.035 0.035
3组 0.035 0.035 0.050 0.050
4组 0.035 0.035 0.055 0.055
双曲线形 1组 0.035 0.035 0.042 0.042
2组 0.035 0.035 0.042 0.035
3组 0.035 0.035 0.035 0.035
4组 0.035 0.035 0.035 0.035
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