Journal of Textile Research ›› 2021, Vol. 42 ›› Issue (11): 159-165.doi: 10.13475/j.fzxb.20210100107

• Machinery & Accessories • Previous Articles     Next Articles

Design and simulation of Lorentz force actuated maglev knitting needle actuator

LIU Zexu1,2, XU Guangshen1,2, SHENG Xiaochao1,2(), DAI Xinyi1,2   

  1. 1. College of Mechanical and Electrical Engineering, Xi'an Polytechnic University, Xi'an, Shaanxi 710048, China
    2. Xi'an Key Laboratory of Modern Intelligent Textile Equipment, Xi'an, Shaanxi 710048, China
  • Received:2021-01-04 Revised:2021-07-29 Online:2021-11-15 Published:2021-11-29
  • Contact: SHENG Xiaochao E-mail:xchsheng@xpu.edu.cn

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Abstract:

In order to solve the problems of friction, impact in triangle knitting needle drive, and avoid the nonlinear influence of electromagnetic force, this paper presents a maglev knitting needle actuator based on Lorentz force. Firstly, the driving principle and mathematical model were proposed, and the electromagnetic finite element analysis is carried out with ANSYS; Secondly, the PID controller is designed, and the system control model is built and simulated in MatLab/Simulink; Finally, the physical platform is built for experimental verification. Magnetic field simulation shows that the magnetic field in the working area of the model is uniform and stable, and the electromagnetic force meets the driving requirements. The control system simulation results show that the needle trajectory is consistent with the expected trajectory, and the simulation error is within ±3.5 μm. The experimental results of the physical platform show that the needle can reach the height of tuck, with rapid, stable and no oscillation, and the experimental error is within ±10 μm. Lorentz force actuated maglev knitting needle actuator can eliminate the friction, vibration and impact in the needle movement. Compared with reluctance force actuated knitting needle actuator, the control system is simple, linear and the control precision can reach micron level.

Key words: knitting needle driving, maglev, Lorentz force, textile machinery, magnetic field finite element method

CLC Number: 

  • TS183

Fig.1

Principle of Lorentz force actuated maglev knitting needle actuator"

Fig.2

Structure of Lorentz force actuated maglev knitting needle actuator"

Fig.3

Model stress analysis. (a)Knitting needle rise; (b)Knitting needle drop"

Fig.4

Magnetic field finite element mesh generation"

Fig.5

Results of magnetic field simulation. (a)Magnetic lines distribution; (b)Magnetic flux density distribution"

Fig.6

Radial magnetic induction intensity"

Fig.7

Motion trace of maglev knitting needle"

Fig.8

Block diagram of Lorentz force actuated maglev knitting needle actuator control system"

Fig.9

Overall model of control system"

Fig.10

Curve of control system response. (a)Displacement response; (b)Displacement error response"

Fig.11

Lorentz force actuated maglev knitting needle actuator prototype"

Fig.12

Results of physical experiment. (a)Displacement response; (b)Displacement error response"

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