Journal of Textile Research ›› 2020, Vol. 41 ›› Issue (09): 136-142.doi: 10.13475/j.fzxb.20191201607

• Machinery & Accessories • Previous Articles     Next Articles

Study on magnetic field distribution in permanent magnetic needle drive using hybrid magnetic suspension needle

LI Dongdong1, ZHANG Chengjun1,2(), ZUO Xiaoyan1,2, ZHANG Chi1,2, LI Hongjun1, ZHOU Xiangyang1   

  1. 1. School of Mechanical Engineering & Automation, Wuhan Textile University, Wuhan, Hubei 430073, China
    2. Hubei Digital Textile Equipment Key Laboratory, Wuhan Textile University, Wuhan, Hubei 430073, China
  • Received:2019-12-05 Revised:2020-03-01 Online:2020-09-15 Published:2020-09-25
  • Contact: ZHANG Chengjun E-mail:zchengj_wuse@163.com

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Abstract:

In order to study the spatial magnetic field distribution with mixed magnetic suspension for driving flat-bed knitting needles, two permanent magnet needles in cylindrical and rectangular shapes were constructed. According to the ampere loop theorem that permanent magnets are equivalent to vertical coil current loop structure, knitting needle was deduced based on the vertical movement to the space location of the magnetic induction intensity. On the basis of the above, finite element electromagnetic simulation was carried out to simulate the model of permanent magnet knitting needles, and an experimental measuring platform for the spatial magnetic field strength of knitting needles was built for numerical measurement. Through the comparison of model, simulation and experimental measurement results, it is shown that in cylindrical permanent magnetic knitting needles, the larger the thickness-diameter ratio is, the greater the magnetic induction intensity becomes. In rectangular permanent magnetic knitting needles, the magnetic induction intensity with constant thickness decreases as the aspect ratio increases.

Key words: suspension needle, superimposed magnetic field, permanent magnetic needle, knitting equivalent model, flat-bed knitting machine

CLC Number: 

  • TP311

Fig.1

Diagram of magnetic driving structure for knitting needles"

Fig.2

Geometric model (a) and equivalent circulation model (b) of permanent magnet"

Fig.3

Equivalent model of magnetic induction of point in space"

Fig.4

Demagnetization curve of neodymium magnet"

Fig.5

Cuboid permanent magnet equivalent model. (a) Ampere stack model;(b) Ideal magnetic field distribution model"

Tab.1

Structural parameters of two ermanent magnets"

形状 材料 直径/mm 长度/mm 宽度/mm 高度/mm
圆柱体 铷铁硼
(Nd35)		 [4,6,8,10] — — [2,3,4,5]
长方体 铷铁硼(Nd35) — [10,20,30,40] 10 [2,3,4,5]

Fig.6

Magnetic induction simulation results. (a) Cylindrical permanent magnets with different aspect ratios; (b) Cuboidal permanent magnets with different aspect ratios"

Fig.7

Three-dimensional cloud image of magnetic induction intensity change. (a) Cylindrical; (b) Cuboidal"

Fig.8

Magnetic induction numerical results. (a) Cylindrical permanent magnets with different aspect ratios; (b) Cuboidal permanent magnets with different aspect ratios"

Fig.9

Magnetic induction test results. (a) Cylindrical; (b) Cuboidal"

Fig.10

Error value distribution. (a) Cylindrical permanent magnet needle;(b) Rectangular permanent magnet needle"

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