共查询到19条相似文献,搜索用时 125 毫秒
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金刚石高成核选择比图形化技术 总被引:4,自引:1,他引:3
报道了一种新的金刚石薄膜选择生长图形化技术。首先用直流偏压增强的微波等离子体化学气相沉积(MPCVD)对图形区域(Si)高密度金刚石成核,接着对掩模区域(SiO2)进行一次化学浅腐蚀,然后正常生长金刚石薄膜,得到表面光滑、侧壁陡直的金刚石精细图形。用该技术制作了金刚石微马达结构,其厚度为2μm,转子直径150μm。图形间隙可控制至1-2μm。 相似文献
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2 0世纪60年代发展起来的微 电子技术和集成电路(IC),已构成人类文明的重要基础。获得巨大成功的微电子技术引入微型机械领域,又引发了一场革命,而1987年由华裔留美学生冯龙生等人研制的转子直径为60μm和100μm的硅微型静电电机,显示出利用硅微加工工艺制作微小可动结构并与IC兼容制造微小系统的潜力,在国际上引起轰动。科幻小说中描述把自己变成小昆虫钻到别人的居室或心脏中去的场景将要成为现实,同时,也标志着微机电系统(MicroElectro Mechanical Systems,MEMS)的诞生… 相似文献
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文章提出了一种基于定子齿三维运动的新型超声波马达(以下简称PTHDUSM)。与传统超声波马达(以下简称CONTUSM)相比,PTHDUSM具有以下显著优点:无轴承、无需润滑、提高输出力矩1.5~2倍、高稳定性、低噪声。文中首先分析了PTHDUSM的理论模型,并根据理论模型制作了实验样机。该样机性能参数为:直径18mm,厚度10mm,重量17g,输出转矩0.05N·m,转速20~160r/min。文章提出的基于定子齿三维运动的新型超声波马达作为小型驱动器能广泛应用于航空航天、医疗器械、机器人、光学仪器以及办公自动化设备等领域。 相似文献
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电磁型微马达的微转子研究 总被引:4,自引:2,他引:2
简要介绍了直径2mm电磁型微马达的结构和磁路。对微转子的设计和加工,多微磁极的写(充)入和均匀性进行分析和讨论。测量了不同充磁条件下的微转子剩余磁化强度和微转子之间的吸力。 相似文献
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Variable-capacitance micromotor with levitated diamagnetic rotor 总被引:1,自引:0,他引:1
A novel micromotor is described, in which the gear-shaped pyrolytic graphite rotor is levitated, rotated and constrained by the combination of static magnetic, electrostatic forces and torques. Two concentric ring-shaped permanent magnets are presented, which are used for realising the static magnetic field. By the microelectromechanical systems process, the metal electrodes, pads and SU-8 column post were fabricated on the silicon substrate above the magnets. The stator was assembled by the silicon and the magnets. The three-phase axial variable-capacitance motor principle was applied for driving the rotor. The rotor is stably levitated to a height of about 0.70 mm over the magnets. When a 30 V driving voltage was added, the rotor speed was over 10 rpm in atmosphere. 相似文献
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Dhuler V.R. Mehregany M. Phillips S.M. 《Electron Devices, IEEE Transactions on》1993,40(11):1977-1984
The operation of harmonic side-drive micrometers is studied through gear ratio measurements and modeling of the micrometer dynamics. A simple experiment in which the wobble micromotor gear ratio is measured as a function of excitation voltage and pattern is used to characterize micromotor operation. This experiment in conjunction with the micromotor dynamic model presented can be used to study friction at the micromotor bearing and bushing contacts by fitting the model to the experiment. The model accounts for sliding and rolling of the rotor on the bearing, and sliding of the rotor on the bushing. The model can be used in conjunction with the experiment to estimate the bearing coefficient of friction and the bushing friction force. For micromotor operation in nitrogen gas, a polysilicon on polysilicon coefficient of friction of 0.36-0.4 is estimated. The bushing frictional force is found to consist of a constant term and a term that depends on the square of the excitation voltage 相似文献
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V. V. Amelichev I. V. Godovitsyn A. V. Il’kov A. Yu. Kostromin 《Russian Microelectronics》2012,41(7):419-423
Problems of simulating an electrostatic micromotor based on the SOI structure with the use of application programs are discussed. Results of calculating the construction of the electrostatic micromotor over a wide frequency range are presented. It is shown that, when increasing the direct voltage applied to control electrodes, the useful capacity increases and the parasitic capacity decreases; at the same time, the front of the amplitude-frequency characteristic is transferred to the low-frequency region. 相似文献
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Favrat P. Paratte L. Ballan H. Declercq M.J. de Rooij N.F. 《Mechatronics, IEEE/ASME Transactions on》1997,2(3):153-160
The use of electrostatic forces in micromechanical systems is well known, but quite high voltages are needed to produce usable forces. In this perspective paper, a 1.5-V battery-supplied integrated circuit able to drive an electrostatic micromotor is presented. The application-specific integrated circuit (ASIC) can output signals up to 80 V, with low-voltage controlling signals. It is especially designed for portable (wristwatch-like) applications. High voltage can be produced by either switching or charge-pumping power supplies 相似文献
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In a novel stator structure, the levitated, stability and rotating coils of a micromotor with an electromagnetically levitated rotor are separated and of multi-loop. This micromotor has improved stability, levitation and rotation performance. With current of appropriate value and frequency in the coils, the rotor of 2.2 mm diameter and 20 /spl mu/m thick is levitated to a height of 300 /spl mu/m, and its rotating speed can reach 1400 rpm. 相似文献
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针对传统欠压锁定(UVLO)电路结构复杂和响应速度慢的问题,设计了一种高精度的快速响应欠压锁定电路.该电路整体均由CMOS管组成,结构简单且易于实现.采用电流模控制技术,随电源电压呈二次方曲线变化的自偏置电流控制阈值电压的产生,有效提高了电路的响应速度.该欠压锁定电路基于0.18μm BCD工艺设计,并利用HSPICE进行仿真验证,当电源电压在0~5V区间变化时,输出电压翻转的上阈值门限为3.91 V,相应下阈值门限为3.82V,迟滞量为90 mV,温度在-40~125℃范围变化时,阈值门限电压容差仅为0.9μV,可实现输出电压的高精度转换,电路面积仅为15 μm×48μm. 相似文献