电磁铁驱动的微进给机构的研究

本文介绍一种非圆曲面车削加工用的电磁铁驱动的微进给机构，进行了理论分析，并给出了系统性能的测试结果。结果表明，该机构结构简单。输出力大，响应性好，而且成本低，因此值得进一步研究和推广使用。     

基于AMESim的ABS液压电磁阀动态响应仿真研究

汽车防抱死制动系统是保证汽车制动性能的重要执行机构.为研究该系统的电磁阀部分对系统增减压时的动态响应及其主要参数对控制效果的影响,采用AMESim这一模块化的建模平台,围绕电磁阀对液压控制系统的一部分进行了建模,并建立了主要模块的数学模型,分析了电磁阀频率与最大开度流量对动态响应的影响.     

车用鼓式电磁制动器电磁体磁路

分析了新型车辆制动器——电磁制动器制动过程的机理及其关键部件电磁体的受力与磨损状况,根据电磁 体磨损面内外侧磨损的不均匀以及电磁体工作过程中的旋转倾向,提出并设计了非长短轴对称的准椭圆形电磁体 磁路,通过电磁场分析软件Ansoft Maxwell 3D对电磁体磁路进行了分析和理论计算,并对电磁体结构进行了优 化。仿真和试验结果表明,电磁制动器制动时电磁体工作平稳,磨损均匀,制动力满足特定车型的要求,为实现 车辆线控制动打下了基础。     

基于耦合场分析的电磁振动料斗的动态设计

对电磁振动料斗进行参数化有限元建模，运用有限元分析软件ANSYS对该模型进行动态分析，计算出振动料斗的固有频率和振型、电磁铁吸力、谐响应振幅等，通过电磁场和机械结构的顺序耦合分析，得到最佳的料斗参数。实际应用效果表明，有效缩短了电磁振动料斗的设计和调试周期。     

车辆电磁制动器电磁体磁场分析

采用有限元法建立电磁体-摩擦环三维模型。考虑电磁体和摩擦环之间的磁接触,对电磁体进行电磁场分析,得到电磁体内部磁感应强度关于电磁体长轴呈对称分布,而关于短轴呈不对称分布的结论。分析了气隙大小对于电磁吸力的影响,得到了电磁吸力-气隙关系曲线,最后利用电磁体试验台,对电磁吸力-气隙关系曲线进行试验验证。     

Design and Experimental Evaluation of a Magnetorheological Brake

A new magnetorheological (MR) brake prototype was designed, fabricated and tested. Firstly, the rheological properties of MR fluids, in particular the dynamic yield stress, were experimentally investigated based on a Bingham plastic model. The working principles of the MR brake were then analysed and discussed. The equations for transmitted torque were derived and used to evaluate the disc-shaped MR brake. This was followed by an analysis of an electromagnet using the finite element method. Following the manufacturing and fabrication of a brake prototype, the mechanical performance of the MR brake was experimentally evaluated with a specially designed test rig. The effects of magnetic field and rotary speed on the transmitted torque were addressed, and an amplifying factor was introduced to evaluate the brake performance. It was found that brake torque increased steadily with the increment of magnetic field or rotary speed. The amplifying factor showed an increasing trend with the magnetic field but a decreasing trend with rotary speed. ID="A1"Correspondance and offprint requests to: W. H. Li, Centre for Mechanics of Micro-Systems, School of Mechanical and Production Engineering, Nanyang Technological University, Nanyang Avenue, 639798 Singapore. Email: mwhli@ntu.edu.sg     

一种新型啮合式磁吸传动系统的电磁有限元分析

介绍一种新型的啮合式磁吸传动系统,它将电动机和减速机结合在一起,结构和制造工艺简单、传动比大、成本低、可靠性高。在分析其结构和工作原理的基础上,建立有限元分析模型,采用磁矢量势分析方法（MVP）对这种磁吸传动系统进行二维静态仿真,得到了系统的静态性能,并分析了磁势、工作气隙、材料等各种因素对该系统传动性能的影响。将计算结果与现有电机产品进行比较,得出该系统的优缺点。     

EAST中性束注入器稳态偏转磁铁的参数设计与估算研究

中性束注入器偏转磁铁是剥离束流中剩余离子的关键设备,它与剩余离子吞食器等内部部件构成了中性束注入器的束偏转系统。束偏转系统的性能对中性束注入器束流的品质及其束传输效率发挥着重要作用。本文根据EAST(Experimental Advanced Superconducting Tokamak,EAST)中性束注入器对束偏转系统的要求,对其偏转磁铁各性能参数进行了估算。为中性束注入器设计了一台用以剩余离子180°偏转的偏转磁铁。该偏转磁铁采用H型二极电磁铁结构;其磁极端面设计为138cm×47cm的圆角矩形结构;其线圈设计为每侧2饼,每饼2层,每层8根的串联结构,导线选用外方内圆空心铜导体,以满足偏转磁铁稳态运行的需要。该设计的偏转磁铁在370 A励磁电流条件下,可提供80keV氘离子束偏转所需的磁场。实验测试结果显示:500 A励磁电流稳态运行条件下,偏转磁铁线圈冷却水温升约21.5℃,该设计结构的偏转磁铁满足EAST中性束注入器满参数稳态运行和未来运行参数逐步提高的需要。     

单片机牵引电磁铁参数测试系统中的多路显示器

本文主要介绍单片机在牵引电磁铁多数测试实验中如何实现多路显示,阐述了多路显示器遇到的一些特殊问题.     

Development of magneto abrasive flow machining process

Abrasive flow machining (AFM) is a relatively new process among non-conventional machining processes. Low material removal rate happens to be one serious limitation of almost all such processes. Limited efforts have hitherto been directed towards improving the efficiency of these processes so as to achieve higher material removal rates by applying different techniques. This paper discusses the possible improvement in surface roughness and material removal rate by applying a magnetic field around the workpiece in AFM. A set-up has been developed for a composite process termed magneto abrasive flow machining (MAFM), and the effect of key parameters on the performance of the process has been studied. Relationships are developed between the material removal rate and the percentage improvement in surface roughness of brass components when finish-machined by this process. Analysis of variance has been applied to identify significant parameters and to test the adequacy of the models. Experimental results indicate significantly improved performance of MAFM over AFM.