本文介绍了开关磁阻电机驱动系统(Switched Reluctance Drive, SRD)的发展概况、系统构成以及目前的研究热点。 关 键 词: 开关磁阻电机 研究热点 Abstract:In this paper, development, construction and research focus of Switched Reluctance Drive were introduced. Keywords: Switched Reluctance Motor Research focus 1 发展简介 开关磁阻电机(Switched Reluctance Motor, SRM)最早可以追溯到1970年,英国Leeds大学步进电机研究小组首创一个开关磁阻电机雏形。到1972年进一步对带半导体开关的小功率电动机(10w~1kw)进行了研究。1975年有了实质性的进展,并一直发展到可以为50kw的电瓶汽车提供装置。1980年在英国成立了开关磁阻电机驱动装置有限公司(SRD Ltd.),专门进行SRD系统的研究、开发和设计。1983年英国(SRD Ltd.)首先推出了SRD系列产品,该产品命名为OULTON。1984年TASC驱动系统公司也推出了他们的产品。另外SRD Ltd. 研制了一种适用于有轨电车的驱动系统,到1986年已运行500km。该产品的出现,在电气传动界引起不小的反响。在很多性能指标上达到了出人意料的高水平,整个系统的综合性能价格指标达到或超过了工业中长期广泛应用的一些变速传动系统。下表是当时对几种常用变速传动系统各项主要经济指标所作的比较。成本 1.0 1.5 1.0 美国、加拿大、南斯拉夫、埃及等国家也都开展了SRD系统的研制工作。在国外的应用中,SRD一般用于牵引中,例如电瓶车和电动汽车。同时高速性能是SRD的一个特长的方向。据报道,美国为空间技术研制了一个25000r/min、90kW的高速SRD样机。我国大约在1985年才开始对SRD系统进行研究。SRD系统的研究已被列入我国中、小型电机“八五”、“九五”和“十五”科研规划项目。华中科技大学开关磁阻电机课题组在“九五”项目中研制出使用SRD的纯电动轿车,在“十五”项目中将SRD应用到混合动力城市公交车,均取得了较好的运行效果。纺织机械研究所将SRD应用于毛巾印花机、卷布机,煤矿牵引及电动车辆等,取得了显著的经济效益。 从上世纪90年代国际会议的上有关SRD系统的文章来看,对SRD系统的研究工作已经从论证它的优点、开发应用阶段进入到设计理论、优化设计研究阶段。对SR电机、控制器、功率变换器等的运行理论、优化设计、结构形式等方面进行了更加深入的研究。
上传时间: 2013-10-11
上传用户:xjz632
The #1 Step-by-Step Guide to labviewNow Completely Updated for labview 8! Master labview 8 with the industry's friendliest, most intuitive tutorial: labview for Everyone, Third Edition. Top labview experts Jeffrey Travis and Jim Kring teach labview the easy way: through carefully explained, step-by-step examples that give you reusable code for your own projects! This brand-new Third Edition has been fully revamped and expanded to reflect new features and techniques introduced in labview 8. You'll find two new chapters, plus dozens of new topics, including Project Explorer, AutoTool, XML, event-driven programming, error handling, regular expressions, polymorphic VIs, timed structures, advanced reporting, and much more. Certified labview Developer (CLD) candidates will find callouts linking to key objectives on NI's newest exam, making this book a more valuable study tool than ever. Not just what to d why to do it! Use labview to build your own virtual workbench Master labview's foundations: wiring, creating, editing, and debugging VIs; using controls and indicators; working with data structures; and much more Learn the "art" and best practices of effective labview development NEW: Streamline development with labview Express VIs NEW: Acquire data with NI-DAQmx and the labview DAQmx VIs NEW: Discover design patterns for error handling, control structures, state machines, queued messaging, and more NEW: Create sophisticated user interfaces with tree and tab controls, drag and drop, subpanels, and more Whatever your application, whatever your role, whether you've used labview or not, labview for Everyone, Third Edition is the fastest, easiest way to get the results you're after!
上传时间: 2013-10-14
上传用户:shawvi
Complete support for EBNF notation; Object-oriented parser design; C++ output; Deterministic bottom-up "shift-reduce" parsing; SLR(1), LALR(1) and LR(1) table construction methods; Automatic parse tree creation; Possibility to output parse tree in XML format; Verbose conflict diagnostics; Generation of tree traverse procedures
标签: Object-oriented Deterministic Complete notation
上传时间: 2014-11-29
上传用户:kr770906
此软件应用了桌面表单,自定义菜单,常用工具条,数据表加密,TREE等控件技术。新学者可以借鉴。人性与个性化的界面设计,嘿嘿,还真值得一看
上传时间: 2015-01-18
上传用户:远远ssad
This scheme is initiated by Ziv and Lempel [1]. A slightly modified version is described by Storer and Szymanski [2]. An implementation using a binary tree is proposed by Bell [3]. The algorithm is quite simple: Keep a ring buffer, which initially contains "space" characters only. Read several letters from the file to the buffer. Then search the buffer for the longest string that matches the letters just read, and send its length and position in the buffer.
标签: initiated described modified slightly
上传时间: 2014-01-09
上传用户:sk5201314
Contains a complete archiver by Haruhiko Okumura. The archiver uses an LZ engine whose output is compressed with static Huffman. The file is chopped into pieces which all get their own independent set of Huffman tree s. ARJ 2.41, ZIP 2.0 and PKZIP 2.04g use essentially the same method. ZOO and LHA even use excactly the same method.
标签: archiver Contains complete Haruhiko
上传时间: 2014-01-17
上传用户:himbly
项目描述: Fink is an attempt to bring the full world of Unix Open Source software to Darwin and Mac OS X. Packages are downloaded and built automatically and installed into a tree managed by dpkg. Fink试图将Unix开源软件世界带入到 Darwin 和Mac OS X。工具包可以被下载和自动生成,并安装到由dpkg管理的树状结构中。 来源: http://sourceforge.net/projects/fink/
标签: software attempt Darwin Source
上传时间: 2015-04-17
上传用户:tedo811
我比较喜欢的一个组件常用的互动组件(Combobox、checkbox and Radio) ... www.huachu.com.cn/itbook/itbookinfo.asp?lbbh=BB ... 91K 2005-6-9 - 百度快照 ... www.baidu.com/ s?ct=0&ie=gb2312&bs=Jtable%D6%D0%BC%D3%C8%EBcheckbox&sr=&z=&wd=Jtable++... - 20k - 补充材料
标签: itbookinfo Combobox checkbox huachu
上传时间: 2014-01-21
上传用户:Amygdala
一、编程环境: windows2003 +visual stdio c++ .net,Ado + SQL2000 二、SQL设置: 将在SQL2000下建立schooldata数据库,导入数据文件 三、导入数据: data目录下有school_back数据库备分文件 操作:用SQL企业管理器还原数据库来导入数据 访问本地数据库服务器,密码是自己设置的那个,操作schooldata数据库的用户名和密码相同。 主要用ADO访问数据库,和几个显示数据的控件Treectrl,listctrl,datagrid等程序中有几个BUG还没解决, 四、实现功能: 操作:在选择查询条件:选择一个,tree控件里显示相关信息 可以在tree控件里单击来显示每个ITEM,每个ITEM相关信息显示在LIST控件内 双击LIST控件显示具体信息 也可以在窗口里单击右键或操作菜单具体操作 五、主要功能: 查询,添加,删除,显示“学院,各系,班级,学生,教师,社团,课程”等信息 程序还用了Active Skin 对程序进行了换肤!!
标签: SQL 2000 schooldata windows
上传时间: 2015-04-26
上传用户:zyt
我的算法作业,求一个在总花费小于1500的条件下从源结点到目的结点的最短路径,源代码Tree.cpp(C++语言编写,VC++6.0 IDE下调试通过),利用的是分支定界算法。可执行文件Tree.exe说明在ReadMeFirst请按照说明使用。
标签: 算法
上传时间: 2015-04-30
上传用户:watch100