共查询到19条相似文献,搜索用时 78 毫秒
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Ralph Ralola 《今日电子》2006,(11):33-33
日本国家高级工业科学与技术研究所的一个研究组正在利用快速移动的细菌来驱动微转子马达,这是第一个在无机材料中加进了细菌的微机械器件。这种生物分子马达能比传统的马达更有效的将化学能转化为机械能,还能在大型结构中发挥自修复和自组织的潜能,有望用在微型机器人和微小电子系统中。 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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圆筒型非接触超声马达的实验研究 总被引:10,自引:3,他引:7
研制了一种圆筒型非接触超声波马达,其定子圆筒和转子间设置了间隙。文中给出马达的结构及激振方法,并测试了样机的输出性能。实验表明,马达转子的转动方向与接触型马达转子转动方向相反,输出转速与输入电压具有线性关系。 相似文献
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Garverick S.L. Nagy M.L. Rao N.K. Hartsfield D.K. Purushotham A. 《Solid-State Circuits, IEEE Journal of》1997,32(1):23-30
The theory, design, and measured performance of an integrated circuit which enables closed-loop control of electrostatic micromotors is presented. The micromotor control integrated circuit (MCIC) consists of low-noise sense electronics designed to detect critical rotor angles to a resolution of 0.5° (0.05 fF) at a 1-MHz sampling rate, and control logic which cycles the micromotor drive state during continuous rotation to maintain maximum torque, independent of loading. Noise due to MOSFET switches and amplifiers in the analog section is modeled and shown to be 32 μV referred to the system input, i.e., about half the desired switching resolution. The MCIC was fabricated using a 2-μm, n-well CMOS process and functions as expected. The noise probability density function was measured using MCIC's digital output for different values of input-to-ground capacitance in order to verify the noise model. Good agreement with theory was observed, although the comparator exhibited some offset and hysteresis 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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双向转角电磁铁输出扭矩特性仿真分析 总被引:2,自引:0,他引:2
基于电磁场有限元仿真,探讨了双向转角电磁铁的工作机理,分析了其输出扭矩特性.针对工业应用中,双向转角电磁铁在0°位置启动时,需要较大启动电流,且在0°~90°范围内提供的输出扭矩较小,为了获得较大输出扭矩,确定最佳工作区,采用电磁场有限元分析软件Maxwell 2D/3D,对不同安匝数的双向转角电磁铁进行瞬态仿真计算,得到电磁铁转子旋转180°过程中各角度的磁场分布以及输出扭矩,探讨了其实现双向旋转的工作机理.仿真结果表明:双向转角电磁铁的最佳工作区在40°~~140°之间,输出扭矩会随着线圈安匝数的增多而增大.该仿真结果为双向转角电磁铁的工业应用提供了依据. 相似文献
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Zebin Yang Qifeng Ding Jialei Ji Qian Zhao 《International Journal of Electronics》2013,100(12):1829-1844
The traditional squirrel-type bearingless induction motor (BIM) suspension winding generates induced current in its squirrel-cage rotor and affects the phase and amplitude of the suspension force. Based on the analysis of the spatial distribution of torque winding magnetic field and suspension winding magnetic field, a new type of wound rotor BIM is designed. Different from the squirrel-cage rotor, the wound rotor uses a special method of embedding a set of coils at any symmetrical four rotor slot positions, so as to only induce the torque winding magnetic field. The induced current, air-gap magnetic density, magnetic field line distribution, suspension force as well as electromagnetic torque of the traditional squirrel-cage motor and the new wound motor are analysed by Maxwell finite element calculation. The results show that the designed new wound BIM can not only effectively suppress the induced current of suspension winding, eliminating its influence on the suspension force, but also has a better starting performance. 相似文献
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Analytical and experimental investigation on the magnetic field and torque of a permanent magnet spherical actuator 总被引:2,自引:0,他引:2
Liang Yan I-Ming Chen Guilin Yang Kok-Meng Lee 《Mechatronics, IEEE/ASME Transactions on》2006,11(4):409-419
This paper presents the torque model of a ball-joint-like three-degree-of-freedom (3-DOF) permanent magnet (PM) spherical actuator. This actuator features a ball-shaped rotor with multiple PM poles and a spherical stator with circumferential air-core coils. An analytical expression of the magnetic field of the rotor is obtained based on Laplace's equation. Based on this expression and properties of air-core stator coils, Lorentz force law is employed for the study of the relationship between the rotor torque and coil input currents. By using linear superposition, the expression of the actuator torque in terms of current input to the stator coils can be obtained in a matrix form. The linear expression of the actuator torque will facilitate real-time motion control of the actuator as a servo system. Experimental works are carried out to measure the actual magnetic field distribution of the PM rotor in three-dimensional (3-D) space as well as to measure the actual 3-D motor torque generated by the actuator coils. The measurement results were coincident with analytical study on the rotor magnetic field distribution and actuator torque expressions. The linearity and superposition of the actuator torque were also verified through the experiments. 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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Abdel-Khalik A.S. Masoud M.I. Williams B.W. Mohamadein A.L. Ahmed M.M. 《Industrial Electronics, IEEE Transactions on》2010,57(1):22-34
This paper presents the steady-state model, performance, and stability analysis of a mixed pole machine with a new operational mode which provides a rotor torque and an n -phase rotor electrical output power to a shaft-mounted rotating electrical load. The machine operated under this mode can be used in applications that require contactless power, such as in robotics, or applications that require independent control of both rotor torque and rotor electric power, such as for contactless rotational antennas and turret systems. The performance assessment includes electromagnetic torque, electrical efficiency, mechanical efficiency, and total efficiency based on both simulation and experimentation. The effect of electrical loading and stator voltage on both rotor torque and rotor electric power is also considered. The machine steady-state stability is introduced by plotting the machine operating characteristics that determine all stable operating regions of the machine under the proposed mode of operation. 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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本文推荐一种镀液,用于制作电磁型微电机转子坡莫合金导磁层,研究了该镀液的组成和工作条件对镀层成份和内应力的影响,表明该镀液具有可供选用的电流密度范围宽,允许较高Fe2-浓度和镀层内应力低等优点。 相似文献