共查询到20条相似文献,搜索用时 93 毫秒
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研制了一种新型直线压缩机驱动用动磁式直线振动电动机。建立了电动机磁路物理模型,并对电动机动子动力学模型进行了求解,得到了电磁驱动力的基本要求,分析了电动机参数对动子运动特性和电动机性能的影响。运用电磁场有限元方法对动磁式直线电动机电磁场模型求解,磁通分布揭示了电磁力产生机理,分析并优化了不同于传统直线电机的设计方式。数据分析揭示了动磁式直线电动机力-位移-电流之间的关系,为压缩机和电动机控制系统设计奠定了基础。 相似文献
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今天,由于交流感应电动机的构造简单、价格便宜、使用方便、保护容易等优点,因此它在工业上获得了极其广泛的应用。作为一个高中毕业生,是应该懂得有关交流感应电动机的基础知识的。我们在讲授“三相交流电”的基础上,又进行对交流感应电动机作了补充讲授。尽管感应电动机的构造比直流电动机简 相似文献
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法拉第电动机使用电刷改变流经转子线圈中电流的方向,若无电刷的情况下法拉第电动机似乎不能维持转动.事实上无电刷法拉第模型电动机在人为给转子线圈初始角动量的情况下却可以不停地转动.提出了转子线圈转轴跳动假设,给出无电刷法拉第模型电动机转动的动力学解释,并得到实验验证. 相似文献
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针对永磁同步电动机中存在的混沌运动,给出了一种基于冲洗滤波(washout filter)技术的永磁同步电动机混沌控制方法.该方法以永磁同步电动机的电流作反馈,实现了混沌运动的控制.该控制方法不影响原系统的参数,只需要调整滤波器的控制参数,算法简单、易于工程实现.数值仿真结果表明了该方法的有效性和鲁棒性.
关键词:
冲洗滤波器
永磁同步电动机
混沌控制 相似文献
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根据法拉第磁光效应的非互易性,分析了旋光反射腔的光强输出特性,表明这种反射腔具有旋光增强效应.在此基础上提出了用于检测微小旋转角的旋光增强法,并对旋光增强器的特性进行了理论分析和仿真计算.给出了测量灵敏度随器件反射率、样品吸收因素及一次旋光角变化的关系,讨论了角度测量工作点、测量范围以及相对灵敏度理论极限问题.旋光增强器有望应用于微流控系统的旋光检测以及实现磁旋光仪器的小型化和微型化.
关键词:
法拉第磁光效应
磁旋光增强
微小旋光角检测
微流控系统 相似文献
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D. K. Mansfield L. C. Johnson 《International Journal of Infrared and Millimeter Waves》1981,2(4):651-663
Distortion-free intracavity polarization modulation of an optically pumped CH3OH laser is shown to be viable. The possible use of this modulation technique to make a multichannel Faraday rotation measurement on a Tokamak device is discussed. In addition, the CdTe Faraday modulator employed in this study is shown to have an anomalously large Verdet constant. 相似文献
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磁旋光效应实验的旋光特性研究和数据分析 总被引:1,自引:0,他引:1
通过磁旋光效应(法拉第效应)实验,对不同物质的旋光特性有所认识。实验发现,磁旋光性物质具有左旋和右旋之分,而且它的旋光方向是由磁场的方向来决定。根据实验数据分析获得磁场强度与偏振角之关系,观察磁场电流与旋光方向的关系,进一步了解不同介质的旋光特性。 相似文献
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利用二能级体系速率方程,推导了半导体中探测光探测到的法拉第旋转光谱的理论模型,发现电子-空穴对的复合对法拉第旋转信号随时间的衰减有重要影响,并利用该模型对GaAs量子阱中实验测得的法拉第旋转光谱进行拟合,得到GaAs量子阱材料中的电子自旋弛豫时间为73.5 ps,而直接利用单指数进行拟合得到的电子自旋弛豫时间仅为51.3 ps. 因此,直接利用单指数对法拉第旋转光谱进行拟合得到电子自旋弛豫时间的传统做法是不准确的.
关键词:
自旋弛豫时间
时间分辨法拉第旋转光谱
GaAs量子阱 相似文献
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M. I. Dolotenko A. K. Zvezdin G. G. Musaev V. V. Platonov V. I. Plis A. I. Popov V. N. Popov O. M. Tatsenko A. V. Filippov 《Physics of the Solid State》2000,42(4):726-729
The Faraday rotation of europium organic glass (based on polymethyl methacrylate) in megagauss fields is investigated experimentally
and theoretically. The experiment was performed using an MK-1 magnetic explosion generator and laser radiation at the wavelength
λ=0.85 μm at T=30 K. It is found that the dependence of the rotation angle of the polarization plane on the magnetic field is nonlinear.
The theoretical results are compared with the experimental data. The contribution of the orbital angular momentum of europium
ions to the Faraday effect is revealed. The conclusion is drawn that the previously found anomalies of the Faraday effect
for the laser radiation at the wavelength λ=0.63 μm are brought about by the magnetooptical resonance, which is induced by
the ultrastrong field.
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Translated from Fizika Tverdogo Tela, Vol. 42, No. 4, 2000, pp. 708–711.
Original Russian Text Copyright ? 2000 by Dolotenko, Zvezdin, Musaev, Platonov, Plis, A. Popov, V. Popov, Tatsenko, Filippov. 相似文献
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A robust one-beam interferometer with external phase-delay control is described. The device resembles a Mach-Zehnder interferometer in which the two arms are together in one collimated beam. However, the proposed device is not an amplitude-division interferometer but a wave-front division one. The phase-delay control occurs at the interferometer output with the help of two polarizing beam splitters, a quarter-wave plate, a Faraday rotator, and a polarizer. An additional phase delay is introduced by application of an electrical current to the Faraday rotator or by rotation of the polarizer (the latter is of topological origin), which permits the use of techniques of phase-stepping interferometry. 相似文献
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R. Lenke G. Maret 《The European Physical Journal B - Condensed Matter and Complex Systems》2000,17(1):171-185
We have studied the influence of magneto-optical Faraday rotation on coherent backscattering of light experimentally, theoretically
and by computer simulations of Monte-Carlo type. The consistency of these three approaches reveals new aspects of the propagation
of vector waves in turbid media with and without Faraday rotation. Experimentally, we have demonstrated that the Faraday rotation
may almost completely destroy the reciprocity of light paths. However, as shown by the simulations, the cone of coherent backscattering
may not only be destroyed but also shifted off the exact backscattering direction, parallel to the magnetic field, as long
as the amount of circular polarization is not completely destroyed by the multiple scattering. The relationship between coherent
backscattering, depolarization and Faraday rotation are explained by a simple path model of vector waves. This leads to a
new characteristic correlation length required to properly describe the influence of Faraday rotation on multiple light scattering.
Received 28 January 2000 相似文献
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We have theoretically investigated the giant Faraday rotation effect in graphene coupled to metal nanoparticles (MNPs). MNP-induced Faraday rotation effect (MIFRE) results in a giant Faraday rotation angle in high-frequency region where usually no significant Faraday rotation would occur in graphene. Another advantage of MIFRE is the enhanced amplification of the rotating light beam. Furthermore, the MIFRE can be tuned by changing the MNP–graphene distance. The high efficiency and tunability of MIFRE in graphene predict its potential applications in novel graphene-based optical modulators and switches. 相似文献