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1.
应用电磁学理论、机械力学以及电子技术自制了一套磁悬浮演示实验仪.该演示实验仪利用线性霍尔传感器来探测悬浮物体的位移,以达到控制悬浮的目的,添加数码管电压显示电路,定量显示电磁铁的磁性在悬浮过程中随悬浮物位置变化的自动调整,能精确而直观地演示磁悬浮的物理现象.该仪器结构简单、性能稳定、操作方便,能广泛用于课堂演示、课程设...  相似文献   

2.
针对传统真空不传声实验装置的缺陷在于底座传声,提出悬浮发声体的设想,并通过磁悬浮来实现.文章介绍了磁悬浮的原理和实验装置,并做了实际测试.数据分析显示,演示效果有了显著改善.  相似文献   

3.
高温超导飞轮储能演示实验   总被引:1,自引:0,他引:1  
利用准单畴高温超导块材的磁悬浮特性,自制了开放性演示实验室或课堂教学所用的超导飞轮储能演示实验装置.电机驱动磁悬浮飞轮高速旋转,切断电源后因磁悬浮摩擦损耗极小能量得以储存下来.用电磁感应将磁悬浮飞轮的转动动能转换为电能,持续点亮LED发光管.该实验装置,能直观展示超导磁悬浮飞轮储能现象,可用于超导和能源相关课程的配套实验或课堂演示.  相似文献   

4.
电磁悬浮熔炼是利用电磁悬浮力实现对高导电率材料悬浮熔炼的一种无坩埚材料加工处理技术,在熔炼过程中避免材料与容器壁接触,是研究、制备高纯材料不可或缺的,具有诸多优点.本文介绍自行研制的高导电率材料电磁悬浮和熔化演示实验装置及其有趣的实验现象,对电磁悬浮现象进行了理论分析,并数值计算了几种不同励磁线圈结构电磁悬浮力分布,合理解释了各种实验现象产生原因.该实验装置演示效果极佳,实验现象奇妙,揭示了浅显物理原理.适合对中学、理工科大学学习物理的学生开展直观教学,也适合科技馆向青年学生展示.  相似文献   

5.
新型无摩擦高速高温超导磁悬浮轴承是高温超导磁悬浮技术最有潜力的应用之一,具有巨大的工业应用前景。文中分析比较了轴向型和径向型两种高温超导磁悬浮轴承的特点,并利用轴向型高温超导磁悬浮轴承结构简单、制作容易的优点,设计制作了一台双轴向型高温超导磁悬浮轴承样机。实验结果显示,上、下两高温超导磁悬浮轴承完全实现了2.4kg转轴的稳定悬浮及无接触旋转运行,目前受驱动电机转速限制,最高试验转速为3000 rpm。在稳定运行的基础上,该轴承样机将最终用于高温超导飞轮储能系统的原理演示。  相似文献   

6.
高温超导磁悬浮飞轮储能系统样机   总被引:1,自引:0,他引:1  
在日益严峻的能源问题背景下,为展示无源高温超导磁悬浮技术在能量储存领域的应用前景,我们设计制作了一台全高温超导磁悬浮形式的飞轮储能样机.样机主要由高温超导磁悬浮轴承、飞轮转子、永磁电机和电路控制及负载部分组成.上下两个轴向型高温超导磁悬浮轴承用于悬浮和稳定飞轮转轴,直径200mm重量1.4kg的飞轮转子作为储能载体,最高可实现13000r/min的转速.在演示运行中,采用灯泡作为负载,该样机完成了从电能→机械能→电能的相互转换.  相似文献   

7.
一种高温超导磁悬浮装置   总被引:1,自引:0,他引:1  
本文介绍一个基于倒挂吸引式(EMS)原理的高温超导磁悬浮试验装置.这个装置由高温超导磁体、单臂梁金属导轨、位置传感器、控制电路等组成.绕制超导磁体线圈所用的是Bi-2223/Ag高温超导线材.超导磁体工作在激磁电流为3.2A时,在5mm的空气间隙中产生0.21T的磁通密度,与单臂梁金属导轨可产生72N的垂直悬浮力.通过引入压控电流源,利用常规的超前一滞后校正实现了该磁悬浮装置的稳定悬浮和鲁棒控制,在负载变化87.5%的情况下仍能实现超导磁悬浮装置的稳定悬浮.该试验装置首次验证了高温超导线圈的可控性问题,为进一步探索高温超导线圈用于磁悬浮轨道交通系统的可行性打下了基础.  相似文献   

8.
磁悬浮运动演示仪   总被引:2,自引:1,他引:1  
基于磁悬浮与电磁驱动原理研制了磁悬浮运动演示仪.该演示仪不仅可以演示磁悬浮运动,还可以开展多种相关实验探究.本文详细介绍了演示仪的设计与制作,并举例说明了利用该该仪器开展的探究活动.  相似文献   

9.
设计制作了以太阳能为动力的太阳能电磁动力旋转仪器、太阳能永磁悬浮旋转仪器和悬挂式太阳能叶片旋转仪器.演示仪使用了不同的悬浮原理,使其转轴部分与仪器其他部分不存在机械接触,同时能够保持自身稳定平衡.演示内容涵盖了太阳能电池板原理、各种形状磁场分布、通电线圈受力分析和悬浮力分析.  相似文献   

10.
介绍了电磁感应与磁悬浮实验的原理,利用步进电机、转盘、磁铁、力传感器及光耦等组建了电磁感应系统,测量了悬浮力及磁牵引力与铝盘转速的关系,演示了电磁感应的产生条件及其现象,加深了学生对电磁感应现象及电磁感应定律的理解.  相似文献   

11.
The production method of magnetic suspension consisting of ferromagnetic particles dispersed in cedarwood oil is presented at the beginning of this article. Next, the set-up for microwaves generation using a klystron is described. The main part of this paper concerning microwave transmission and polarization during its passage in samples of the produced magnetic suspension placed in a magnetic field is based on the following parameters: induction of this field, filling factor of magnetic suspension by ferromagnetic particles, dimensions of particles, viscosity of liquid carrier, and ratio of the magnetic field changes. Conducted investigations show that microwaves are damped and polarized in these magnetic suspensions. Obtained results are discussed and observed effects are explained by ordering of ferromagnetic particles in magnetic suspension by applied magnetic field.  相似文献   

12.
光学头力矩器的空间磁场分布直接决定了力矩器的动态性能,对磁场进行准确分析是力矩器设计的前提。分析了悬线式力矩器的空间磁场产生机理,并采用有限元分析法进行了理论推导。以一款动线圈式二维对称型只读悬线式力矩器为例,采用有限元仿真软件(ANSYS)分析并设计了其空间磁场分布,对影响力矩器空间磁场分布的相关因素进行了分析。将采用有限元法对悬线式力矩器空间磁场仿真计算得出的力矩器动态特性参数与实测力矩器动态特性参数相比,其结果均符合力矩器的设计要求,证明基于有限元分析法的悬线式力矩器空间磁场设计是可行的。  相似文献   

13.
The size of the terrestrial magnetosphere is determined by the balance between the solar wind dynamic pressure and the pressure exerted by the magnetosphere, principally that of its magnetic field. The shape of the magnetosphere is additionally influenced by the drag of the solar wind, or tangential stress, on the magnetosphere. This drag is predominantly caused by the mechanism known as reconnection in which the magnetic field of the solar wind links with the magnetic field of the magnetosphere. The factors that control the rate of reconnection of the two fields are not understood completely, but a southward direction of the interplanetary field is critical to enabling reconnection with the dayside low-latitude magnetosphere, resulting in magnetic flux transfer to the magnetotail. Numerical simulations suggest that the conductivity of the ionosphere controls the rate of reconnection, but this has not been verified observationally. Although solar wind properties ultimately control the interaction, the properties of the plasma that make direct contact with the magnetosphere are different than those of the solar wind, having been altered by a standing bow shock wave. This standing shock is necessitated by the fact that the flow velocity of the solar wind far exceeds the velocity of the compressional wave that diverts the solar wind around the Earth. The upper atmosphere is the final recipient of all the energy and momentum that enters the magnetosphere. Coupling takes place along the magnetic field Lines principally in the polar and auroral region via current systems that close across the magnetic field both at low and high altitudes and flow parallel to the magnetic field between high and low altitudes  相似文献   

14.
激光聚变靶丸磁悬浮系统设计   总被引:5,自引:3,他引:2       下载免费PDF全文
 为实现均匀辐照,ICF靶的无接触支撑是关键,ICF磁靶悬浮是实现无接触支撑的理想途径之一。对ICF靶的磁悬浮系统进行了初步设计,利用超前相位补偿器作为内回路改善系统的稳定性。仿真试验时,系统在初始阶段(0~10 ms)小球出现轻微振荡,之后逐渐趋于稳定,最终到达设定的目标位。悬浮系统控制曲线平滑,调节时间短,这说明ICF靶磁悬浮是可行的。  相似文献   

15.
The dynamics of single-domain magnetic nanoparticles cross-linked into multiparticle aggregates by organic ligands is considered. Mechanical factors of the effect of low frequency magnetic field on macromolecules attached to magnetic nanoparticles/aggregates within a suspension or gel are analyzed. The optimum conditions ensuring the best control over biochemical reactions in suspension by an external magnetic field (i.e., the ranges of frequency and magnetic field intensities, and the size of magnetic nanoparticles and shells covering them) are determined.  相似文献   

16.
报道一种新的磁性粒子浓悬浮体系沉降稳定性的表征方法。对均匀分散的磁性粒子浓悬浮体系,采用定时光度测量法对其沉降稳定性进行表征,可以得到一定时间内粒子沉降的定量数据。此方法可用于低体积分散磁流变液沉降稳定性的表征。同时,对比分析表明,在磁性粒子浓悬浮体系中加入纳米级TiO2粒子,能使制备的磁流变液稳定性显著增强。  相似文献   

17.
On the stability of a free surface of a magnetic fluid under microgravity   总被引:1,自引:0,他引:1  
We have investigated the behavior of a free surface of a suspension of ferrimagnetic particles in heptane under strongly reduced gravity. It was found that the free surface is destabilized when a homogeneous magnetic field parallel to the surface is applied. The strength of the critical magnetic field parallel to the surface varies with the volume concentration of magnetic particles in the suspension. We show that the destabilization of the fluid layer is forced by the influence of the suspension on the homogeneity of the magnetic field producing a magnetic field component normal to the fluid surface. The dependence of the critical magnetic field on the volume concentration of magnetic particles can be explained by applying the theory of the normal-field instability to this field component under conditions of strongly reduced gravity. The experiments were carried out at the drop tower ‘Bremen’ of the Center of Applied Space Technology and Microgravity (ZARM) in Bremen.  相似文献   

18.
Voronkov  V. S.  Malkin  S. A. 《Technical Physics》2011,56(11):1675-1678
The problem of reducing electric losses in a magnetic suspension is considered. Specifically, the feasibility of decreasing electric losses in dynamics in addition to the well-known method of loss reduction in statics by means of permanent magnets is discussed. It is demonstrated by an example of a simple magnetic suspension with permanent magnets that, when the suspension is brought to equilibrium, the functional in the dependence of the electromagnet coil current squared reaches a minimum; i.e., electrical losses are minimized in dynamics.  相似文献   

19.
It is well known today that a continuous stream of highly ionized plasma is emitted from the Sun’s surface. This plasma is called the solar wind and consists of protons, electrons, and light nuclei. The solar wind pushes the solar magnetic field into interplanetary space to form the interplanetary magnetic field. The interplanetary magnetic field is a dynamical system that depends on the solar cycle and the Sun’s rotation phase. Thus, the Solar System is a natural plasma physics laboratory with an enormous multitude of different effects showing the current state of the system. By recording cosmic-ray fluxes, one can study the behavior of the interplanetary magnetic field and obtain information about processes that occur both on the Sun’s surface and throughout the Solar System. The main short-time variations in cosmic-ray intensity include the 27-day variations and the Forbush decreases. These variations are caused by complex solar plasma structures, which are generated by different processes on the Sun’s surface and propagate through space in a wide range of velocities. Cosmic-ray fluxes recorded with the PAMELA magnetic spectrometer on board the Resurs DK1 satellite in 2006–2016 are used to show some examples of cosmic-ray variations.  相似文献   

20.
We investigate the viscosity behavior of a magnetic suspension in which magnetic particles are dispersed in a mixture of polyacrylic liquids. The size of magnetite particles is nearly 300 nm and the volume fraction of the magnetic particles is in the range of 0.003-0.03. The particle concentration dependence of the suspension viscosity yields the intrinsic viscosity [η], which varies from 25.6 at 5 s−1 to 5.1 at 400 s−1. The yield stress and the infinite shear viscosity of the suspension increase non-linearly as the particle concentration ? increases. We examine the effect of process conditions such as milling time and amount of dispersant on the viscosity behavior of the suspension. As milling time elapses, yield stress and low shear viscosity decrease and then reach constant values while the infinite shear viscosity remains constant. When oleic acid is added as a dispersant, the yield stress and low shear viscosity of the suspension show minimum values as the amount of oleic acid increases. These results agree with experimental results of sedimentation tests, which enable us to estimate the aggregate size of magnetic suspension. The yield stress and the low shear viscosity of the magnetic suspension are found to be useful in evaluating the dispersion state of the magnetic suspension.  相似文献   

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