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自主行走机器人小车的软硬件研究_电气工程论文
电气工程论文 摘要：本文通过对ARM开发和研究，实现移动机器人小车自主行走，速度反馈和红外线避障的功能。 小车系统的组成主要包括避障传感器部分，电机控制部分，速度反馈部分以及ARM嵌入式系统核心控制部分。避障传感器系统采用红外线技术，主要完成对障碍物的感应；移动机器人小车的电机控制转速部分采用步进电机作为电机首选；还有速度反馈的部分，由于ARM板内部没有记数的功能，我们就设计了传感器数据读取的一个系统。最后，贯穿整篇文章的是对机器人的核心部分（基于ARM嵌入式系统）的研究和设计，主要让操作系统完成控制功能（主要是通过接收避障系统感应外界环境所返回的信号，进而控制运动控制系统，从而完成一个自主运动的智能功能）。 关键词：ARM板；自主行走；红外线感应；嵌入式操作系统；电机 Abstract:The main idea of the Thesis is passed developing and studying to ARM, Realize the Function of displacement robot handcart going autonomously, Speed couples back and Infrared ray avoids blocker. Systematic composition includes a handcart mainly avoiding blocker sensor part, Electric motor control section, Speed couples back part and ARM implants dyadic system core control section. Avoid blocker sensor system adopt the infrared ray technology, Accomplish the induction to obstruction mainly. The rotation rate part displacement robot handcart electric motor is controlled adopt step-by-step electric motor to elect as the electric motor head, Since not having mark number function in the inside of ARM board,we have designed a system that the sensor data fetches right away, Through the entire sheet article's finally, is to study and design that (owing to that ARM implants style systematically) to robotic core part, Dodging OS mainly to accomplish a control function (is by the fact that taking-over avoids meeting signal returned to by blocker system induced the external world environment mainly , controls motion navar then , accomplishes a intelligence function acting on self's own moving thereby). Keywords：ARM board； Going autonomously；Infrared ray induction； Embedded Operation Syetem,；Electric motor
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某化工厂10KV降压变电所设计
目 录 摘 要III AbstractIV 1 前 言1 1.1 课题的意义和目的1 1.2 电能的特点及工厂变电所的作用1 1.3 工厂供电的发展趋势1 1.4 工厂供电设计的要求2 2 原 始 材 料3 2.1 主体设计依据3 3 负荷计算4 3.1 负荷计算的意义4 3.2 负荷计算的方法4 3.3 负荷计算的过程4 4 变压器选择6 4.1 主变压器台数的确定6 4.2 主变压器容量的确定6 4.3 补偿电容器的选择6 5 拟定全厂配电系统草图8 5.1 电气主接线的概述8 5.2 电气主接线的设计原则和要求8 5.3 电气主接线方案的比较10 6 短路电流计算13 6.1 短路电流计算的一般概述13 6.2 短路电流的计算15 7 电气设备选择和校验20 7.1 高压电器选择的一般原则20 7.2 高压电器设备的选择、校验20 8 变电所位置选择28 8.1 配电室建筑要求28 8.2 控制室布置29 8.3 配电设备的布置原则29 8.4 防雷保护装置29 8.5 防雷接地设计30 8.6 过电压接地保护30 9 继电保护32 9.1 任务、基本要求、微机保护32 9.2 保护的设置33 10 总 结36 致 谢37 参考文献38 附录139 附录240 摘 要 本次设计的主要任务是为某化工厂10KV降压变电所总体设计。该系统为 10kV电源进线，经过主变压器降压 6kV 输送到各车间变电所，车间变电所再降压成 220V，供给各车间使用。文中对主接线的选择、高压设备的选择、负荷计算、短路电流计算,各种继电保护选择和整定计算皆有详细的说明。特别对主接线的选择,变压器的选择,还有一些电气设备如断路器、电流互感器、电压互感器等的选择校验作了详细的说明和分析。其中还对变电所的主接线，平面布置，高低压侧的一些保护装置等通过CAD制图直观的展现出来。本次设计的内容紧密结合实际，通过查找大量相关资料，设计出符合当前要求的变电所。设计中除采用了一些固定方式的保护和常规保护外，还采用微机保护，通过电力监控综合自动化系统，可以使变电站内值班人员或调度中心的人员及时掌握变电所的运行情况，直接对设备进行操作，及时了解故障情况，并迅速进行处理，达到供电系统的管理科学化、规范化、并且还可以做到与其他自动化系统互换数据，充分发挥整体优势，进行全系统的信息综合管理。 关键词: 短路电流计算,继电保护,断路器，微机保护 Abstract The main task of this design is to work out a best design of a chemical plant consumer 10kv step-down. This system has a 10kv power line, than the power would be set to each workshop by a 6kv step-down transformer. At last, the power should be used by each workshop which must be transformer to 220v by step-down transformer first. This design included the line and high-pressure equipment selection, local calculation, short-circuit current calculation, and all sorts of relay protection setting calculation had been instructed detailed. Especially the choice of wiring and transformer, electrical equipment such as circuit breaker, current transformer, voltage transformer etc choice had been instructed detailed. This design fixes protection and conventional protections, also adopts microcomputer protection, through the electric control integrated automation system, it can make the substation attendants or dispatching center within the personnel to grasp the operation situation of substation, directly on the equipment operation, timely, and quickly and fault handling, so it achieves the power supply system, scientific, standardized management, and also can do and other automation system data interchange, give full play to the advantage of the whole system, the comprehensive management information. Keyword: the calculation of short current, the protection of relay, circuit breaker, PC protection
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智能电导仪的研制_电气工程论文范文
电气工程论文 摘要：众所周知, 电导测量在工业生产和科学实验中有着十分重要的意义。电导仪是测定溶液导电度大小的仪器,由于其方法简单、速度快、准确度高而广泛运用于火电、化工化肥、冶金、制药、环保等行业以及其它精密测试分析中。电导法也是水质鉴定和监测的重要手段,它是通过测量水溶液的电导值,并根据溶液的电导与溶液中待测离子的浓度之间的定量关系来确定待测离子的含量的。 电导仪是一种应用非常广泛的测量仪器。然而，传统电导仪的温度、极化效应和电容效应的影响引起的误差需人工进行补偿，或使用复杂的硬件电路，造成使用不便，电路复杂、校正范围小。 本论文在大量的试验基础上，把单片机应用到测量仪器中，将电导池看作电导检测电路中的一个输入电阻，采用单片机输出交变信号作为电源激励检测电路，使用单片机控制量程的自动切换，接着进行数字式全波整流，并且充分利用单片机仪器的优势,将检测电路的增益系数的调准和误差的补偿用软件来实现,最大限度地简化了硬件电路，增加了LCD液晶显示模块，设计研制成智能电导监测仪。该仪器具有测量精度高，自动量程切换，电导率值直读显示，操作简单等优点。 关键词：电导仪；单片机；电导率；软件补偿；全波整流 Abstract:As we all know, conductivity measurement in industrial production and scientific experiments is of great significance. Conductance NG is the solution conductivity of the size of machines, because of their method is simple, fast and high accuracy and wide application of thermal power, chemical fertilizer, metallurgy, pharmaceuticals, environmental protection and other industries, as well as other sophisticated test analysis. Conductivity is the water quality monitoring and identification of important means, it is aqueous solution by measuring the conductivity values, and the solution according to the solution conductivity and the concentration of analyze ion the quantitative relationship between the analyze ions to determine the content. Conductance instrument is a very extensive application of the measurement apparatus. However, traditional instrument temperature conductivity, capacitance effects and polarization effect of the error caused the need for artificial compensation or the use of complex hardware circuit, causing inconvenience to the use of circuit complexity, the scope of a small correction. In this paper, in a lot of experiments, based on SCM application of the instrument, conductance pool will be seen as conductivity detection circuit of an input resistance. SCM using alternating signal output power as incentive detection circuit, the use of SCM control range of automatic switching, followed by digital full-wave rectifier, and take full advantage of the advantages of microcontroller devices. Detection Circuit will gain coefficient fine-tune and error compensation software to achieve maximum simplifies the hardware circuit, increase the LCD display module, the design and development of a smart conductivity monitor. The instrument has high measurement accuracy, automatic switching range, the conductivity value of direct reading, the advantages of simple operation. Keywords：Conductance NG； Conductivity； SCM；Software Compensation ；Full-wave rectifier
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SCB10树脂浇注干式变压器的设计_电气工程论文
电气工程论文 目录 1绪论1 1.1干式变压器发展概况1 1.2干式变压器类型3 1.3干式变压器结构及优点6 2树脂浇注绝缘干式变压器设计的理论基础8 2.1绝缘材料的选择8 2.2铁心的选择9 2.3绕组的选择10 2.4环氧树脂浇注工艺特点11 3树脂浇注绝缘干式变压器设计的计算15 3.1变压器设计计算的任务15 3.2变压器设计计算步骤16 3.3树脂浇注干式变压器设计的详细计算17 4干式变压器计算机辅助设计35 4.1计算机在干式电力变压器设计中的应用概况35 4.2变压器设计CAD软件介绍36 5总结41 参考文献43 致谢45 摘要 树脂浇注干式变压器是一种最为广泛应用的干式变压器。其绕组表面由高质量的防护材料组成，形成了覆盖层。即使是在尘埃、潮湿等恶劣环境条件下，对浇注绝缘干式变压器都不会产生影响；其采用的以环氧树脂为基料的绝缘胶具有较强的难燃性，因而不会在发生火灾时助燃；浇注成型绕组的热容量大，因而超铭牌额定值运行能力也强；同时它不像油浸式变压器那样需要定期试验及长期停运后通电干燥处理等措施，简便的维护使得它更受人们青睐。可以预见，随着国民经济的发展，人们对树脂浇注干式变压器的需求量将迅猛增加，同时，对我国的变压器研究事业将产生重要推动作用。 本文在介绍了干式绝缘变压器基础知识的基础上，概述了树脂浇注绝缘干式变压器的技术规范及结构特点，而且，对于生产实际中可能遇到的技术问题，也给出了一些意见及解决方案。在此基础上介绍了其设计理论基础及主要工艺流程，并且以SCB10-1000/10为例，列出了树脂浇注干式变压器如何进行材料的选取以及设计的详细计算过程，包括从变压器铁心、绕组、绝缘、损耗、短路阻抗到树脂等绝缘材料的重量等。由于电子计算机已经成为科学研究领域中一个不可缺少的工具，在变压器制造业也得到广泛应用。最后简要地介绍了一下Auto CAD（计算机辅助设计）绘图系统软件。 关键字：树脂浇注，绕组，干式变压器，技术规范，SCB10-1000/10 Abstract The surface of resin-pouring dry transformer is made of high quality material protection，forming covering layer.Even if it is taken to some terrible environment such as dusty、wet environment , resin-pouring dry transformer still won’t be subjected to persecution .It adopt epoxy resin as insulating compound .Because of the nonflame itself,it can’t support combustion when the fire takes place. Thus the use of the resin-pouring dry transformer has made a great significant development for our country’s power industry. This thesis firstly introduces the structure and characteristics of the resin-pouring dry transformer, and some resolvents of the technique problem that might meet in actual production. On this basis, the thesis introduces the design theories foundation and main technological flow of the resin-pouring dry transformer.and takes the SCB10-1000/10 as an example listed the calculating process in the process of design and also gives some good ideas on how to select stuff for the main parts of the transformer.In the end,because of the computer has become a indispensable device,I summed up the Auto CAD (CAD-Computer Aided Design)plot software. Keywords: ,Cast—resin，winding ，Dry—type transformer，Technical characteristic ，SCB10-1000/10
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简易综合测试仪
目 录 摘要..I Abstract..II 1 绪论.....1 2 总体设计方案......2 2.1 系统总体结构.2 2.2 系统硬件结构..2 2.3 系统总体软件流程.4 3 电压测量及要求....6 4 电平表的设计方案与要点......8 4.1 电平表的设计方案选择.......8 4.2 电平表的设计要点....8 5电平表的设计......11 5.1电平表各模块设计....11 6 电平振荡器的设计方法.....13 6.1 方案选择..........13 6.2 直接数字频率合成技术(DDS - Direct Digital Synthesis)...15 6.3 电平表的设计要点....17 7 电平振荡器的设计...20 7.1 合成频率值的控制21 7.2 幅值控制21 7.3使用继电器实现数控开关.21 8 LCD显示设计..23 8.1 LCD显示电路设计..23 8.2 LCD显示电路软件设计...24 9 抗干扰措施.25 10 结论.......26 致 谢...27 参考文献....28 摘 要 随着现代化技术的不断发展，智能化数字表的功能越来越强，其使用范围也会越来越广泛。采用智能化数字仪器不仅能提高测量准确度，而且能提高电测量技术的自动化程度，从而提高计量检定人员的工作效率。 选频电平表是高灵敏度、高精密的电平测量仪表,它与电平振荡器配套可构成完整的传输测试设备,在电力系统中用于电力载波和电力线保护设备的电平、增益、衰减等特性的测试,以及高频保护收发讯机的测量调试。 选频电平表与电平振荡器随着微电子技术的发展而不断更新换代,采用国际先进的数字直接合成技术(DDS) 使频率稳定度达到了晶振的水平且技术性能显著提高,并使设备日益集成化、小型化、通用化。 本文主要介绍包含选频电平（电压）表和电平振荡器的简易综合测试仪以及具体设计, 选频电平（电压）表采用真有效值/ 直流转换芯片AD637把被测交流信号电压转换为与其有效值相等的直流电压，再经过A/D转换器采样后得到被测信号的电压有效值。电平振荡器采用直接数字频率合成芯片AD9851 进行频率合成，输出频率、增益可控的正弦波，并具有幅频特性测试和幅频特性数据存储回放功能。 关键词： 选频电平表 电平振荡器 DDS 直接数字频率合成 Abstract With the continuous development of modern technology, the function of intelligent digital form is growing, the scope of its use will be more extensive. Intelligent use of digital equipment will not only improve the measurement accuracy, but also improve the electrical measuring the degree of automation technology ,and to improve verification efficiency of the workers. selected frequency level meter is high sensitivity, high level of precision measurement instruments, with the support of level oscillator constitute a complete transmission test equipment, in the power system for testing electricity power line carrier and the level of protective equipment, gain, Attenuation, and the measurement of debugging of the protection of high-frequency transceiver. with the development of microelectronics technology Selected frequency level meter and the level oscillator continuously upgrade, and using international advanced digital direct synthesis (DDS) to achieve a frequency stability of the crystal and the level of technical performance significantly improved, and the Equipment will to the increasingly integrated, smaller and universal. In this paper, contains Simple Comprehensive Test Instrument(Selected frequency level meter and the level oscillator) and its specific design, Selected frequency level meter used AC/DC converter chip AD637 measured the exchange of signals with the RMS voltage converter for the same DC voltage, then after A / D converter sample be tested ,to get the voltage signal RMS . Level oscillator using Direct Digital Synthesis chip AD9851 for Synthesis, output frequency, gain control of the sine wave and a frequency of testing and increase the frequency of data storage playback. Keywords: Selected frequency level meter level oscillator DDS Direct Digital Synthesis
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某地变电所农网10kV配电线路设计
目录 摘 要I AbstractII 第1章 绪 论1 1.1 选题的背景与意义1 1.2 设计依据1 1.3 设计内容1 第2章 配电线路导线的选择3 2.1 配电主线概况3 2.2 10KV高压架空线选择5 2.3 高压电缆选择7 2.4 档距的确定8 第3章 配电变压器的选择与安装9 3.1 10 kV 配电变压器台区的选择9 3.2 10 kV 配电变压器型号的选择9 3.3 10 kV 配电变压器容量的选择10 3.4 10 kV 配电变压器台架的安装10 3.5 跌落式熔断器的安装10 3.6 变压器台区引落线11 3.7 接地装置11 第4章 短路电流计算及高压开关的选择12 4.1 短路电流计算的方法12 4.2 短路电流计算过程12 4.3 高压开关与熔断器的选择15 4.4 互感器的选择16 第5章 电网安全保护方式18 5.1 整定计算方案18 5.2防雷措施20 第6章 提高10kV农村配网供电可靠性的一些措施22 第7章 总结24 致 谢25 参考文献26 附录 电气设计图30 摘 要 论文首先对石浦电力工业的背景和经济发展情况做了简单的介绍。分析了10千伏西泗3317线路原始资料，了解了当地的环境和地理特色，对架空导线以及档距进行选择与设计，并确定了系统走向简图；为了保证架空线路的安全性与可靠性，简单的对各个变压器一次侧的短路电流进行计算，从而选择高压设备，以及保护装置。最后根据一些资料的查阅，对提高电网的可靠行及维护方法，简单的提了一些措施。本设计的主要目标是提高电力系统的可靠性，节约电力企业施工费用，增加企业经济效益，使10kV线路管理进一步实现自动化。 关键词：档距，短路电流计算，保护整定，可靠性 Abstract In these paper, Shipu first paper the background of the power industry and economic development of a brief introduction. Analysis of the 10 kV line in West Si-3317 raw data to understand the local environment and geographical features, as well as files on the overhead wire to choose from and design, and to determine the system to sketch; overhead lines in order to ensure the safety and reliability , a simple one for each side of the transformer short-circuit current calculation in order to select high-pressure equipment, as well as the protection device. According to some information on the final inspection, to improve the power grid lines and the maintenance of a reliable method to a number of simple measures. The main objective of this design is to improve power system reliability, cost-saving construction of electric power enterprises to increase the economic efficiency of enterprises, so that the management of 10kV lines to further automate. Keywords:Span, Short-circuit current computation, Protection installation, Reliability
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学校图书馆智能照明系统设计_电气工程论文范文
电气工程论文 摘要：随着经济的发展和科技的进步，智能楼宇不断涌现。各大高校也掀起了新校区建设的浪潮。相对于商业楼宇，照明在学校智能化建设中显得尤为重要。 本设计选择学校图书馆阅览室的照明作为研究对象（面积：12*9平米，设定其工作时间为每天8：00—22：00），通过与传统照明单一的手动控制的比较，提出了智能照明控制方案并进行了具体实例设计并分别给出了应用示例：对于规模大，控制点位多且有一定照明要求的图书馆，应用基于C-BUS的智能照明控制，该技术可以根据不同的照明场景区域，将照度自动调整到工作最合适的水平；对于一般小规模的图书馆，可以简单的应用PLC实现照明自动控制，但是该技术相对来说节省短期投资。同时，从节能角度出发，根据不同照明方式的灯具的不同布置，对照明负荷分别进行计算，得出结论：采用智能照明更能有效的节省电能。 关键词：智能照明；传统照明；绿色照明；C-BUS总线 Abstract：With the economical development and scientific advance, the buildings equipped with intelligent facility emerge one after another. Building new schoolhouses has become a fever for most schools. Lightening is more important for the intelligent building of school than for commercial building. This research takes the lightening in school library as the object (square: 12*9 square meters, the regulated working time every day:8:00-22:00). By the comparison with the manually- controlled traditional light, the research puts forward the plan of intelligent lightening control, designs specific examples as well as provides their applications. For the large library with many control points and requirements for a certain lightening, the C-BUS based intelligent lightening control is available as it can automatically adjusts the light to the most ideal level for work, according to different lightening places and zones. For the library in small scale, the PLC based intelligent lightening can be applied to automatically control light, and relatively speaking, it saves the investment in short term. Meanwhile, from the conservation of the energy and according to the lights with varied lightening way in different places, respectively calculating their lightening charges draws a conclusion: intelligent lightening can save electric energy more effectively. Keywords： intellectual lighting technology；Green lighing； traditional lighting； C-BUS
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某35KV变电所设计
目 录 摘要………………………………...………………………………………………………….………..Ⅱ Abstract…………………………………………………………………..……………………………Ⅲ 第一章 前言………………………………...………………………………………………..………...1 第二章 设计原始资料………………………………...…………………………………...………...2 第一节 设计依据………………………………………….…………….…………………………….…2 第二节 气象及地质资料…………………..………………..………………...………………………....2 第三节 供用电协议……………………………………………………………………………….……..3 第三章 负荷计算及无功功率补偿………………………………………………………………..5 第一节 负荷计算………………………………………………………………………………….……..5 第二节 主变压器的选择…………………………………………….………………………….…...…..6 第三节 10KV侧无功补偿器的选择……………………………………………………………….……7 第四章 确定变电所位置与主接线图…………...……………………………………………….10 第一节 变电所位置选择与要求………………………………………………………………….……10 第二节 变电所的主接线图……………………………………………………………………….……10 第五章 短路电流计算…………………………………………...…………...…………….………13 第一节 最大运行方式下的短路电流计算……………………………………………………….……14 第二节 最小运行方式下的短路电流计算………………………………………………………….…15 第六章 高低压设备选择…………………………...………………...…………………………….18 第一节 35KV侧设备的选择…………………………………………………………………….…..…18 第二节 10KV侧设备的选择………………………………………………………………………...…22 第三节 开关柜的选择…………....……………………………………………………………….……23 第四节 其他设备的选择…………....…………………………………………………………….……23 第七章 线路的选择………………………………...………………………………………….……25 第一节 10KV侧母线的选择.……………………………………….…………………………..….…..25 第二节 线路的选择………………………………………………………………………………..…...27 第八章 继电保护及其整定………………………...…………………..…………………….……30 第一节 过电流保护………………………………………………………………………………….…30 第二节 速断保护……………………………………………………………………………….………31 第九章 防雷与接地保护…………………………………...…………………...………………….32 第一节 防雷保护………………………………………………………………………………….……32 第二节 接地保护…………………………………………………………………………………….…32 第十章 结论………………………….…………...………………………..…………………………34 致 谢…………………………………………………………………...…………………………....35 参考文献………………………………………………………………...……………………………..36 附录一 工厂总平面布置图 附录二 35KV变电所供电系统图 摘 要 电能是社会主义建设和人民生活不可缺少的重要能源。电力工业在国民经济中占有十分重要的地位。电力系统是国民经济的重要能源部门，而变电所的设计是电力工业建设中必不可少的一个项目。变电所是电力系统中的一套组合设备，通过它电能得以输送、分配、互连、变压、转换等。变电所总体设计差别较大，取决于所遇到的各种情况。因此，要完成的功能决定于变电所设备的多少。这些设备一般包括变压器、断路器、隔离开关、母线、电流和电压互感器以及其它设备和仪器。本文介绍了某电机修造厂35KV总降压变电所的设计。文中对主接线的选择，高压设备的选择，负荷计算，短路电流的计算，各种继电保护的选择和整定计算皆有详细的说明。特别对主接线的选择，变压器的选择，还有一些电气设备如短路器，电流互感器，电压互感器等的选择校验作了详细的说明和分析。最后使用CAD软件画出高低压供配电系统与变电所平面图。 关键词 ：35KV总降压变电所；负荷计算；电气设备选择；CAD制图 Abstract The electrical power is the essential important energy in our daily life . The electric power industry plays a very important role in the national economy. The electrical power system is a very important energy department in the national economy ,and the substation’s design is an essential project in the electric power industry’s construction. The substation is made up of an electrical power system's set of unit equipments, which can transport, assign, interconnect, transform voltage and so on. There are big differences among different substation system’s design, which is decided by kinds of situation. Therefore, the substation’s function which are decided by substation equipment's capacity must be completed. These equipments include the transformer, the circuit breaker, the isolator, the bus bar, the electric current and the voltage transformer as well as other equipment and the instrument generally. This article introduced a factory’s 35KV substation’s design. There are detailed explanations about the main wiring's choice, the high pressure unit's choice, the load computation, short-circuit current's computation, each kind of relay protection's choice and the installation computation in the article, especially, the choice of main wring, transformer and some electric equipment such as circuit breaker, current and voltage sensor. Finally we use the CAD software to draw the high and low pressure to supply the electrical power distribution system and the substation construction chart. Keywords :35KV substation ; the calculation of load; the choice of electric equipment; the graphics of CAD
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数字钟的设计_电气工程论文
目录 摘要 I Abstract II 1 绪 论1 2设计的要求及目的2 2.1设计要求2 2.2 设计目的2 3 单片机的介绍3 3.1单片机的3个阶段3 3.2单片机的发展趋势3 3.3单片机的组成4 3.4单片机的特点4 4 硬件设计6 4.1 单片机模块7 4.1.1 主要特性10 4.1.2 管脚说明10 4.2时钟模块12 4.3复位电路模块15 4.4 LED显示模块16 4.5电源模块18 4.6按键模块19 4.7 PCF8563 与单片机的接口20 5 软件设计21 6 结 论23 致 谢24 参考文献25 附录126 附录229 摘要 本论文介绍了用AT89S51单片机控制的数字钟的硬件结构与软件设计,给出了汇编语言源程序。此数字钟是一个将“时”、“分”、“秒”显示于人的视觉器官的计时装置。它的计时周期为12小时，显示满刻度为12时59分59秒99毫秒，另外应有校时功能。电路由时钟脉冲发生器、时钟计数器、译码驱动电路和数字显示电路以及时间调整电路组成。用晶体振荡器产生时间标准信号，这里采用石英晶体振荡器。根据60秒为1分、60分为1小时、24小时为1天的计数周期，分别组成两个60进制（秒、分）、一个12进制（时）的计数器。构成秒、分、时的计数，实现计时的功能。显示器件选用LED七段数码管。在译码显示电路输出的驱动下，显示出清晰、直观的数字符号。 单片机数字钟是一种用数字电路技术实现年、月、日、星期、时、分计时的装置，与机械式时钟相比具有更高的准确性和直观性，且无机械装置，具有更长的使用寿命，因此得到了广泛的使用。 关键词：单片机；AT89S51；数字钟 Abstract The paper mainly presents the hardware and software design of the digital clock using AT89S51. The source program using assemble Language is given. This digital clock is a time-device, which can display "hour", "minute", "second". Its time period is 12 hours and the full scale of the display is 12 hours, 59 minutes, 59 seconds and 99 milliseconds and it has the function of time adjustment. The circuit consists of the clock pulse generator, the clock counter, decoding drive circuit, digital display circuit and the time adjustment circuit. It generates time standard signal using crystal oscillator, here is the quartz crystal oscillator. Because 60 seconds is 1 minute, 60 minutes is 1 hour and 24 hours is 1 day, we uses two counters of 60 parts and a counter of 12 part separately to constitute the count of percentage of second, second, minute and hour. So it can realize time function. Display component selects seven-segment numerical tube LED. Driven by decoding output circuit, it can display showing clear and intuitive figures. Due to walking error of digital clock, we design time calibrat in the system. Single-chip microcomputer is the most common digital clock, digital clock with a digital circuit technology to achieve year, month, day, week, the time of installation, compared with the mechanical clock has a higher accuracy and Intuitive, and no mechanical devices, has a longer life, it has been widely used. Key words：Single-chip microcomputer AT89S51 Digital clock
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KBSG9矿用干式防爆变压器设计_电气工程论文范文
电气工程论文 目录 1绪论1 1.1矿用变压器的分类和产品系列1 1.2矿用隔爆型移动变电站2 1.3矿用隔爆型干式变压器5 2矿用干式变压器设计的理论基础8 2．1硅钢片的选择8 2．2铁心的选择9 2．3绕组及绝缘纸的选择11 2.4外壳的选择12 3 矿用隔爆型干式变压器设计的计算15 3.1变压器设计计算的任务15 3.2变压器设计计算步骤17 3.3 矿用隔爆型变压器设计的详细计算20 4 变压器结构工程图39 5总结42 参考文献43 致谢44 附录一45 摘要 矿用干式变压器具有节能低噪、高可靠性等优点。井下隔爆型干式变压器的诞生，更好的解决了井下供电问题。因此研究设计性能良好的矿用隔爆型干式变压器具有十分重要的工程价值。 本文首先介绍了矿用变压器的基础知识，概述了矿用隔爆型干式变压器的技术规范及结构特点。然后， 对其设计理论作了简单阐述。并以KBSG9-1250/10为例，系统地给出了矿用干式变压器设计过程，重点是电磁计算，主要包括变压器铁心计算、绕组计算、绝缘计算、损耗计算、短路阻抗计算等。最后绘制了部分工程图。 关键字：矿用干式变压器，电磁计算，结构设计，KBSG9-1250/10 Abstract The mine dry-type transformer has the following advantages such as energy-saving low-noise and high reliability. The birth of underground flameproof dry-type transformer has solved the problem of underground power supply much better. So the research and design of the mining flameproof dry- type transformer has a very important value. This article firstly introduces the basic knowledge of the mining transformer and summarizes the technical specifications and structural characteristics of the mining flameproof dry-type transformer. And then on this basis the article briefly elaborates its design theory. And as an example of KBSG9-1250/10, this article systematically gives the design process of mine dry-type transformer. It emphasizes the electromagnetic computing, which includes calculation of transformer core, calculation of winding, insulation calculation, loss calculation and calculation of short circuit impedance. And at last parts of engineering graphics are drawn. Keywords: mine dry-type transformer, electromagnetic computing, design of structure, KBSG9-1250/10
