數(shù)字控制的交流調(diào)速系統(tǒng)所選用的微處理器、功率器件及產(chǎn)生PWM波的方法是影響交流調(diào)速系統(tǒng)性能好壞的直接因素。在介紹了正弦脈寬調(diào)制(SPWM)技術(shù)的基礎(chǔ)上，設(shè)計(jì)了一種以8098單片機(jī)作為控制器，以智能功率模塊IPM為開關(guān)器件的變頻調(diào)速系統(tǒng)。通過軟件編程，產(chǎn)生正弦脈沖寬度調(diào)制波形來控制絕緣柵雙極晶體管的導(dǎo)通和關(guān)斷，從而達(dá)到控制異步電動(dòng)機(jī)轉(zhuǎn)速的目的。實(shí)驗(yàn)結(jié)果表明，該系統(tǒng)可調(diào)頻率調(diào)電壓，穩(wěn)定度高，調(diào)速范圍寬，具有較強(qiáng)的實(shí)用價(jià)值 Abstract: AC VARiable speed with digital control systems used microprocessors， power devices and generate PWM wave is the direct factors of affecting the performance AC speed regulation system. On the basis of introducing the sinusoidal pulse width modulation (SPWM) technology，this paper designed VARiable speed system which used 8098 as a controller， intelligent power module IPM as switching device. Through software programming， resulting in sinusoidal pulse width modulation waveform to control the insulated gate bipolar transistor turn on and off， so as to achieve the purpose of speed control of induction motors. Experimental results show that the system can adjust frequency modulation voltage， high stability， wide speed range， has a strong practical value.
標(biāo)簽： 8098 SPWM 單片機(jī) 變頻調(diào)速系統(tǒng)
上傳時(shí)間： 2013-11-14
上傳用戶：ynwbosss
車輛行駛性能的好壞，不僅取決于發(fā)動(dòng)機(jī)，而且在很大程度上還依賴于變速器及變速器與發(fā)動(dòng)機(jī)的匹配。在汽車上使用的自動(dòng)變速器大致有三類：液力自動(dòng)變速器（Automatic Transmission，AT）、電子控制機(jī)械自動(dòng)變速器（AutomaticMechanicalTransmission，AMT）和金屬帶式無級(jí)變速器（Continuously VARiable Transmission，CVT）。前兩種變速器都是有級(jí)或分段無級(jí)自動(dòng)變速，無級(jí)變速器CVT避免了齒輪傳動(dòng)比不連續(xù)的缺點(diǎn)，具有傳動(dòng)比連續(xù)、傳遞動(dòng)力平穩(wěn)、操縱方便、可使汽車行駛過程中經(jīng)常處于良好的性能狀態(tài)、可改善汽車排放和降低燃油消耗等特點(diǎn)，真正實(shí)現(xiàn)了無級(jí)變速。我國(guó)的汽車工業(yè)與發(fā)達(dá)國(guó)家有較大的差距，通過研制無級(jí)變速（CVT）控制系統(tǒng)對(duì)縮小差距和世新紀(jì)發(fā)展我國(guó)民族汽車工業(yè)都具有十分重要的意義。
上傳時(shí)間： 2013-11-11
上傳用戶：qingzhuhu
CAT5110/18/19/23/24/25 linear-taper digitally programmable potentiometers perform the same function as a mechanical potentiometer or a VARiable resistor. These devices consist of a fixed resistor and a wiper contact with 32-tap points that are digitally controlled through a2-wire up/down serial interface.
上傳時(shí)間： 2013-11-22
上傳用戶：541657925
51單片機(jī)及其應(yīng)用:1.1.1 電子計(jì)算機(jī)的問世及其經(jīng)典結(jié)構(gòu)1946年2月15日，第一臺(tái)電子數(shù)字計(jì)算機(jī)問世，這標(biāo)志著計(jì)算機(jī)時(shí)代的到來。（CALCULATOR）ENIAC（“埃尼阿克”）◆ENIAC是電子管計(jì)算機(jī)，時(shí)鐘頻率僅有100 KHz，但能在1秒鐘的時(shí)間內(nèi)完成5000次加法運(yùn)算。◆與現(xiàn)代的計(jì)算機(jī)相比，有許多不足，但它的問世開創(chuàng)了計(jì)算機(jī)科學(xué)技術(shù)的新紀(jì)元，對(duì)人類的生產(chǎn)和生活方式產(chǎn)生了巨大的影響 。 匈牙利籍?dāng)?shù)學(xué)家馮·諾依曼在方案的設(shè)計(jì)上做出了重要的貢獻(xiàn)。1946年6月，他又提出了“程序存儲(chǔ)”和“二進(jìn)制運(yùn)算”的思想，進(jìn)一步構(gòu)建了計(jì)算機(jī)由運(yùn)算器、控制器、存儲(chǔ)器、輸入設(shè)備和輸出設(shè)備組成這一計(jì)算機(jī)的經(jīng)典結(jié)構(gòu)。（EDVAC-ELECTRONIC DISCRETE VARiable AUTOMATIC COMPUTER）二、微型計(jì)算機(jī)的應(yīng)用形態(tài) 從應(yīng)用形態(tài)上，微機(jī)可以分成三種：
標(biāo)簽： 51單片機(jī)
上傳時(shí)間： 2013-12-20
上傳用戶：d815185728
項(xiàng)目描述: Fluid is a server daemon for streaming media. The latest release is built as an API for building any kind of media streamer. Following with the server is a plugin for streaming MP3 files, even those with VARiable bitrate. Multicast now supported. Fluid 是一個(gè)為媒體流提供的服務(wù)器后臺(tái)。最新版本建造為一個(gè)API，用于建造任何類型的媒體。服務(wù)器是流式MP3文件的一個(gè)插件，即使其位率可變?，F(xiàn)在也支持組播。 來源: http://sourceforge.net/projects/fluid/
標(biāo)簽： for streaming release daemon
上傳時(shí)間： 2015-04-17
上傳用戶：onewq
This project is created using the Keil ARM CA Compiler. The Logic Analyzer built into the simulator may be used to monitor and display any VARiable or peripheral I/O register. It is already configured to show the PWM output signal on PORT3.0 and PORT3.1 This ARM Example may be debugged using only the uVision Simulator and your PC--no additional hardware or evaluation boards are required. The Simulator provides cycle-accurate simulation of all on-chip peripherals of the ADuC7000 device series. You may create various input signals like digital pulses, sine waves, sawtooth waves, and square waves using signal functions which you write in C. Signal functions run in the background in the simulator within timing constraints you configure. In this example, several signal functions are defined in the included Startup_SIM.INI file.
標(biāo)簽： the Analyzer Compiler project
上傳時(shí)間： 2013-12-19
上傳用戶：Yukiseop
These instructions assume that the 1.4 versions of the java and appletviewer commands are in your path. If they aren t, then you should either specify the complete path to the commands or update your PATH environment VARiable as described in the installation instructions for the Java 2 SDK.
標(biāo)簽： instructions appletviewer the commands
上傳時(shí)間： 2015-06-01
上傳用戶：3到15
最優(yōu)化算法，應(yīng)用有限內(nèi)存擬牛頓方法（Limited Memory (VARiable-storage)quasi-Newton method）求解高維最優(yōu)化問題，使用更多的內(nèi)存將使算法更有效。
標(biāo)簽： 優(yōu)化算法
上傳時(shí)間： 2015-08-08
上傳用戶：cuiyashuo
三次樣條插值程序。編譯運(yùn)行本程序后，程序會(huì)彈出窗口及問句：“input the number of intervals:”，輸入插值的次數(shù)即可，程序?qū)⒌玫降拇螖?shù)保存在變量int n中。如果輸入的插值次數(shù)正確（n>=2），程序會(huì)顯示下一語句："input the value of the VARiable:"，此時(shí)輸入插值點(diǎn)即可，程序?qū)⒌玫降牟逯迭c(diǎn)保存在變量double v中。若插值點(diǎn)正確（v>=0&&v<=6）,則程序?qū)⑤敵霾逯到Y(jié)果。
上傳時(shí)間： 2014-01-16
上傳用戶：Avoid98
By building a nonlinear function relationship between an d the error signal，this paper presents a no— vel VARiable step size LMS(Least Mean Square)adaptive filtering algorithm．
標(biāo)簽： relationship nonlinear building function
上傳時(shí)間： 2015-10-22
上傳用戶：hzy5825468
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