高速磁悬浮驱动织针系统的运动稳定性研究及电磁耦合分析

发布时间：2018-02-02 00:25

本文关键词： 高速磁悬浮驱动织针系统运动稳定性电磁耦合纱线张力模型针织提花圆机　出处：《武汉纺织大学》2017年硕士论文　论文类型：学位论文

【摘要】：针对传统机械式选针方式的低效率、高冲击和摩擦等问题,本课题组提出以新型磁悬浮驱动织针原理代替传统机械式选针驱动方式,通过“以电代机”,实现织针的磁悬浮直接驱动,从原理上提高针织机械的编织效率和性能指标。根据新型磁悬浮选针原理,本课题组初期尝试采用普通圆柱密绕线圈和永磁体的组合结构,通过两者间磁相互作用来实现选针。但经过前期研究发现,圆柱线圈的磁场由于随织针悬浮位移的增大而大幅衰减,使得织针在悬浮过程中的受力变化较大,不仅无法保证在全部行程范围为织针提供足够的电磁驱动力,也不利于织针的稳定悬浮。为此,本课题组提出了一种大行程、大推力、由双曲线型线圈和永磁体构成的新型磁力驱动结构。在此基础上,本文重点研究了该结构的电磁驱动理论模型,分析了织针悬浮运动过程中纱线张力、磁力及磁耦合等因素对织针运动稳定性的影响,主要研究内容包括:(1)探讨针织提花圆玮机在编织时纱线张力对织针运动时的稳定性影响,建立了纱线张力理论模型,通过理论计算、ANSYS仿真和实验,验证了弯纱理论模型的正确性,得到了纱线张力对织针运动的影响规律。(2)研究磁悬浮系统的磁力驱动部分,分析了新型驱动线圈的磁场分布特性,基于织针运动稳定性的要求研究了新型磁力驱动结构的磁力特性与规律,通过ANSYS仿真得到,轴向同轴布置、轴向间距为2mm的双级新型双曲线圈能够实现选针动作,将重约2.6g的织针和永磁体悬浮起来,并且使其在悬浮过程受力较为平稳,织针在工作位移高度的电磁力波动在5%左右。(3)研究磁悬浮织针系统中相邻织针的磁力耦合问题,利用ANSYS磁场仿真,能够实时观察到每一时间子步的针筒间的耦合效应,经过多次修改相邻针筒的轴向和径向间距,得到了不同的耦合结果云图及电磁力波动值,为磁悬浮织针针筒结构的优化设计提供依据和参考。(4)实际制作磁悬浮样机模型,实验结果表明,该新型磁力驱动可满足5英寸样机288针的针织提花圆纬机的编织工艺要求,织针实际工作过程中的电磁力波动范围控制在9.7%以内。综上,本文将样机实验与理论分析的结果进行对比,验证了磁悬浮驱动织针原理及方案的可行性。
[Abstract]:Aiming at the problems of low efficiency, high impact and friction in the traditional mechanical needle selection, our group proposed to replace the traditional mechanical needle selection drive with the new magnetic levitation driving needle principle. In order to improve the knitting efficiency and performance of knitting machinery, the magnetic levitation direct drive of knitting needle is realized. At the beginning of this research group, we try to adopt the combination structure of ordinary cylindrical coils and permanent magnets, and select needles through the magnetic interaction between them. The magnetic field of the cylindrical coil decreases greatly with the increase of the needle suspension displacement, which makes the force of the needle in the suspension process change greatly, not only can not guarantee enough electromagnetic driving force for the needle in the whole travel range. For this reason, a new type of magnetic drive structure, which is composed of hyperbolic coils and permanent magnets, has been proposed by our team, which is composed of hyperbolic coils and permanent magnets. In this paper, the electromagnetic driving theory model of this structure is studied, and the influence of yarn tension, magnetic force and magnetic coupling on the stability of needle motion is analyzed. The main research contents include: (1) to discuss the influence of yarn tension on the stability of knitting needle when knitting, the theoretical model of yarn tension is established, and the theoretical calculation is carried out. ANSYS simulation and experiment verify the correctness of the theoretical model of curved yarn. The influence of yarn tension on needle motion is obtained. (2) the magnetic driving part of magnetic levitation system is studied. The magnetic field distribution characteristics of the new drive coil are analyzed. Based on the requirements of needle motion stability, the magnetic force characteristics and laws of the new magnetic drive structure are studied. The axial coaxial arrangement is obtained by ANSYS simulation. A new double-stage hyperbolic ring with an axial spacing of 2 mm can be used to select the needle, which suspends the needle and permanent magnet weighing about 2.6 g, and makes it more stable in the process of suspension. The electromagnetic force fluctuation of the needle at the working displacement height is about 5%.) the magnetic coupling problem of the adjacent needles in the maglev needle system is studied, and the ANSYS magnetic field simulation is used. The coupling effect of each time sub-step can be observed in real time. By modifying the axial and radial spacing of adjacent syringe several times, different coupling result cloud diagram and electromagnetic force fluctuation value are obtained. It provides the basis and reference for the optimum design of the structure of the maglev knitting needle. 4) the model of the maglev prototype is made. The experimental results show that the model can be used in the design of the maglev prototype. The new magnetic force drive can meet the knitting technology requirements of the 288-pin knitting circular weft knitting machine with a 5-inch prototype. The electromagnetic force fluctuation range in the actual working process of the knitting needle is controlled within 9.7%. In this paper, the experimental results of the prototype are compared with the results of theoretical analysis, and the feasibility of the principle and scheme of the maglev driven knitting needle is verified.
【学位授予单位】：武汉纺织大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TS183.92

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