旋转式微发电机的设计与制造

为了实现旋转式微发电机对微系统的持续供电,研究了旋转式微发电机的设计、制造以及实验方法。首先,设计了具有单转子和单定子的三相、永磁同步微发电机模型。使用传统的磁路分析法得出了微发电机气隙磁密和感应电动势的表达式,确定了微发电机的主要设计参数。对模型进行有限元分析,得到了感应电动势波形。然后,利用精密加工技术加工了转子和定子各构件,并装配成为尺寸为(Φ7×2)mm3的微发电机样机。最后,通过实验得出了微发电机在不同气隙厚度和不同转速下的感应电动势。实验结果显示,在气隙厚度为300μm,转子转速为10kr/min时,微发电机的一相感应电动势峰峰值为26.2mV;当接入0.23Ω的对称负载时,三相输出功率为357.3μW。结果表明,微发电机输出结果比较理想,有望作为微系统的电源装置。

旋转式微发电机的设计与制造

给基于MEMS技术它的微型发电机的体积比较小,但是它的优点就是使用的寿命比较长,现如今已变成了研究的重点。当前,微型发电机主要可以分为两大类;旋转型以及震动行。振动型微型发电机它的结构相对于比较简单,能量的密度比较低,旋转型的微型发动机工作的速度比较快并且它的能量更加的密集。文章主要是分析了微发电机设计,在此基础上讲解了微发电机的加工水平,最后探讨了实验的方式和结果,望可以为有关人员提供到一定的参考和帮助。

氧化还原石墨烯基微流体发电机感应电势影响因素的研究

采用不同浓度的分散液制备了氧化还原石墨烯基微流体发电机,测得了不同NaCl溶液流体流速时的感应电势.根据Nernst-Planck方程建立了工作电极表面扩散层内Na^(+)离子浓度与感应电势之间的量化关系.基于不同流体流速时所测得的感应电势值,分析了流体流速-Na^(+)离子物质输运及其吸附浓度-微流体发电机感应电势之间的影响关系.引入表面纹理纵横比(Str)和最大高度(Sz)等特征参数量化表征了氧化还原石墨烯薄膜的表面形貌,研究了分散液浓度-氧化还原石墨烯表面形貌-工作电极表面Na^(+)离子吸附量-微流体发电机感应电势之间的内在规律.当NaCl溶液流体流速为50μL/min、氧化还原石墨烯浓度为1 mg/mL时,微流体发电机感应电势可达−343 mV.研究结果不但有助于碳基微流体能量收集器工艺参数的优化及性能改进,还有利于与微流道相关的光降解器、离子敏传感器和电化学葡萄糖传感器等器件性能的提升.

基于微尺度压电振动发电机的微电源设计

为弥补传感器网络传统供电存在的不足,该文设计了一种基于微尺度压电发电机的微电源,其可有效拾取周围环境中的振动能量,从而为低功耗的传感器系统提供电能。该电源由具有微尺度效应的微振动发电机与外部高效的无源峰值监测开关电路集成而得,结合Matlab仿真分析可知,其输出电压可达0.24V;无源峰值监测开关电路能保证压电片间电荷的全部输出,与具有经典接口的微电源相比其输出功率提高了3倍。

微环音振荡压电发电机同步电荷能量采集方法

能量采集效率是引信微环音振荡压电发电机能否得到应用的关键之一。在经典能量采集电路和填谷能量采集电路的基础上,采用同步电荷能量采集法,基于脉冲宽度调制技术,设计了一种较高能量采集效率的同步电荷能量采集电路,由微动开关精确控制转移电能时间。理论分析和实验模拟的结果表明,开关精确控制转移电能时间的同步电荷能量采集电路,其输出功率最大且与负载无关,这将有利于微环音振荡压电发电机在不同型号引信中的应用。

微水发电机组选择、安装、使用技术“三要素”

微水发电在山区倍受群众欢迎,发展迅速。现根据我县30多台微型水力发电机组建设与使用情况,简要介绍微水发电机组选择、安装、使用过程中应掌握的“三要素”。一、发电机组选择的“三要素”1。

微能源研究进展述评

随着微机械加工技术水平和微电子技术水平的提高,微机电系统得到了长足发展,能源供电装置是微机电系统中重要的组成部分,普通能源供电装置存在尺寸大、能量密度低、寿命短等缺点,许多学者都致力于研究新型微能源供电装置。通过分析国内外参考文献,对微能源领域当前研究热点进行介绍,包括:微型锌镍电池、微型锂电池、微型燃料电池、微型太阳能电池、微型同位素电池、微型内燃机、振动驱动微能源、摩擦发电机。多种微能源装置各有特点,重点阐述了每种微能源装置的工作原理、研究现状以及当前研究需要克服的难题,最后概括了微能源装置的未来发展趋势。

微动力挑战传统供电

人们对电能的依赖日趋增强,银行、医疗、电信等部门的正常运行对电脑或其他数字设备的依赖性非常强,对电能质量的要求也就变得越来越严格,一次断电事故就会给它们带来严重的损失,而且突然断电不仅会影响到一些重要科研项目的正常进行,还会给人们的日常生活带来不便,因此电力供应的本地化甚至家庭化,也就是微动力的发展是解决问题的有效途径。 也许在以后的5～10年的时间里,集中生产电能然后输送到各地的方式将被取代,微动力发电机将成为提供电能的主要方式。

低成本物理实验之自制“微动力发电”演示装置

据＂电磁感应＂原理,用永磁式减速直流电机和数字稳压器件自制的＂微动力发电＂实验演示装置,可以将微弱振动或转动的机械能转变为电能,可演示水力发电、双向风力发电、潮汐发电等发电原理,并能实时显示发电电压数值,可为手机、平板电脑、MP3等用电器充电,集物理教学演示和移动充电于一体.该装置取材方便,成本低廉,课堂教学演示效果极好,同时师生可自己动手制作,能极大激发学生物理学习兴趣及创新思维,全面提升学生的动手实践能力.

Scaling Analysis and its Applications of Electrostatic Micromotors

An electrostatic micromotor is compared with a conventional electromagnetic mieromotor, and the scaling effect of driving forces is analysed according to their different operation principles. Characteristic dimension L represents the linear scale of micromotors. Electromagnetic driving force is proportional to high-order power of characteristic dimension L whereas electrostatic driving force is not. So, in micro domain, the effect of electrostatic force is larger than that of electromagnetic force, which makes electrostatic micromotor more competitive against electromagnetic alternative in MEMS. In assessing the performance of a micromotor, the power per unit volume and efficiency are the two most important criteria. Hence, the two kinds of micromotors are further compared from these two aspects. The results indicate that electrostatic a micromotor has higher power per unit volume and efficiency, moreover, its structure is simple, it can be made sufficiently small. For those advantages of electrostatic micromotors, they can be used in optical devices, aerospace equipment and medical instruments.

Energy management and coordination control of microgrid in elevated station of urban rail transit

The rapid development of urban rail transit brings convenience to the public,but its huge energy consumption problem cannot be ignored.A microgrid composed of photovoltaic power generation unit,regenerative braking energy feedback unit and battery energy storage unit is proposed,which provides green power for the station.In order to suppress the fluctuation of photovoltaic power generation and the intermittence of regenerative braking feedback energy,the energy management mode of microgrid is designed according to the illumination situation,braking energy feedback situation,battery state of charge and so on.In addition,a coordination control method based on virtual synchronous generator(VSG)is proposed to realize smooth switching among modes.Finally,the proposed energy management and coordination control method for elevated station microgrid is verified by Matlab/Simulink.The results show that the elevated station microgrid can operate safely and reliably under various energy management modes and realize smooth switching among modes.

A Feasibility Study of Power Generation from Sewage Using a Hollowed Pico-Hydraulic Turbine

This study is concerned with the feasibility of power generation using a pico-hydraulic turbine from sewage flowing in pipes. First, the sewage flow rate at two connection points to the Toyogawa River-Basin Sewerage, Japan, was explored for over a year to elucidate the hydraulic energy potential of the sewage. Second, the performance of the pico-hydraulic turbine was investigated via laboratory experiments that supposed the turbine to be installed in the sewage pipe at the connection points. This study indicates that the connection points have hydraulic potential that can be used for power generation throughout the year. It also demonstrates that the pico-hydraulic turbine can be usefully employed for power generation from sewage flowing in the pipe at the connection points.

Design and Sizing Electric Micro Generator Using Thermoelectric Modules

This paper presents the development of a methodology for calculating sizing electric micro sources of power generation using TEG （thermoelectric modules） to capture energy industrial process waste. Since the thermoelectric modules are able to convert a temperature gradient directly into electricity and still occupy a small space, and have no vibration or noise during operation. Furthermore, the cogeneration using thermoelectric modules is totally clean and reuses part of the residual thermal energy to generate power, or improve the overall yield of the process and avoid the emission of gases to the environment. Therefore, this research contributes to the development of a green energy to numerical modeling for the design and dimensioning of micro-sources of electric power generation from performance curves and predetermined temperature gradients industrial processes. The result is an effective methodology for the design and conditioning the voltage level and power of micro allowing the size of the electrical quickly and securely for many industrial applications, varying the types of modules used area, voltage and power generated.

Bias-Polarity Dependent Electroluminescence from a Single Platinum Phthalocyanine Molecule

By using scanning tunneling microscope induced luminescence(STML)technique,we investigate systematically the bias-polarity dependent electroluminescence behavior of a single platinum phthalocyanine(PtPc)molecule and the electron excitation mechanisms behind.The molecule is found to emit light at both bias polarities but with different emission energies.At negative excitation bias,only the fluorescence at 637 nm is observed,which originates from the LUMOtHOMO transition of the neutral PtPc molecule and exhibits stepwise-like increase in emission intensities over three different excitation-voltage regions.Strong fluorescence in region(I)is excited by the carrier injection mechanism with holes injected into the HOMO state first;moderate fluorescence in region(II)is excited by the inelastic electron scattering mechanism;and weak fluorescence in region(III)is associated with an up-conversion process and excited by a combined carrier injection and inelastic electron scattering mechanism involving a spintriplet relay state.At positive excitation bias,more-than-one emission peaks are observed and the excitation and emission mechanisms become complicated.The sharp moleculespecific emission peak at〜911 nm is attributed to the anionic emission of PtPc-originated from the LUMO+1 tLUMO transition,whose excitation is dominated by a carrier injection mechanism with electrons first injected into the LUMO+1 or higher-lying empty orbitals.

The Domination for Evaluation of the Contingent Claims by Nonlinear Generator

In this paper,through applying the result of backward stochastic differential equations,it investigates a domination for pricing of the contingent claims by the use of nonlinear infinitesimal generator of process X. This domination provides a guide for valuing the price of the position on the financial market.

Design and Analysis of Self-excited Miniature Magnetic Generator

Nowadays, electronic devices are more and more integrated into everyday life. These seamless integrations focus on mobility, but at the same time strive to be unobtrusive to the end user. With the introduction of personal data assistants and intelligent cellular phones for the searching of the website, true mobile computing is closer than ever. However, battery technology, which powers most of these mobile connectivity solutions, has not kept up the same pace of improvement. The paper describes a methodology for the design and performance of a self-excited permanent-magnet generator applied to low power supplies. It combines an analytical field model, a lumped reluctance equivalent magnetic circuit, and an equivalent electrical circuit. An illustrated example of a 15-mW, 290-r/min generator is given, and the analysis techniques are validated by measurements on a prototype system.

Study of Microturbine Models in Islanded and Grid-Connected Mode

Modeling and simulation of two different microturbine （MT） models to analyze load following performance as distributed energy resource （DER） have been presented in this paper. The first model consists of speed governor, acceleration control, and temperature control blocks while the other is GAST model. The system comprises a synchronous generator and a MT coupled to it. Simulations are carried out in islanded and grid-connected mode to observe the system response when supplying variable loads. The load following characteristics is observed and validated for this MT-synchronous generator model in Matlab-Simulink environment. This is applicable with combined heat power （CHP） generators both with general fuel as well as bio-fuels. The use of bio-fuels is very much promising for generating green power preventing green house gas emissions for fighting against global warming.