數字控制的交流調速系統所選用的微處理器、功率器件及產生PWM波的方法是影響交流調速系統性能好壞的直接因素。在介紹了正弦脈寬調制(SPWM)技術的基礎上,設計了一種以8098單片機作為控制器,以智能功率模塊IPM為開關器件的變頻調速系統。通過軟件編程,產生正弦脈沖寬度調制波形來控制絕緣柵雙極晶體管的導通和關斷,從而達到控制異步電動機轉速的目的。實驗結果表明,該系統可調頻率調電壓,穩定度高,調速范圍寬,具有較強的實用價值 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.
上傳時間: 2013-11-14
上傳用戶:ynwbosss
車輛行駛性能的好壞,不僅取決于發動機,而且在很大程度上還依賴于變速器及變速器與發動機的匹配。在汽車上使用的自動變速器大致有三類:液力自動變速器(Automatic Transmission,AT)、電子控制機械自動變速器(AutomaticMechanicalTransmission,AMT)和金屬帶式無級變速器(Continuously variable Transmission,CVT)。前兩種變速器都是有級或分段無級自動變速,無級變速器CVT避免了齒輪傳動比不連續的缺點,具有傳動比連續、傳遞動力平穩、操縱方便、可使汽車行駛過程中經常處于良好的性能狀態、可改善汽車排放和降低燃油消耗等特點,真正實現了無級變速。我國的汽車工業與發達國家有較大的差距,通過研制無級變速(CVT)控制系統對縮小差距和世新紀發展我國民族汽車工業都具有十分重要的意義。
上傳時間: 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.
上傳時間: 2013-11-22
上傳用戶:541657925
51單片機及其應用:1.1.1 電子計算機的問世及其經典結構1946年2月15日,第一臺電子數字計算機問世,這標志著計算機時代的到來。(CALCULATOR)ENIAC(“埃尼阿克”)◆ENIAC是電子管計算機,時鐘頻率僅有100 KHz,但能在1秒鐘的時間內完成5000次加法運算。◆與現代的計算機相比,有許多不足,但它的問世開創了計算機科學技術的新紀元,對人類的生產和生活方式產生了巨大的影響 。 匈牙利籍數學家馮·諾依曼在方案的設計上做出了重要的貢獻。1946年6月,他又提出了“程序存儲”和“二進制運算”的思想,進一步構建了計算機由運算器、控制器、存儲器、輸入設備和輸出設備組成這一計算機的經典結構。(EDVAC-ELECTRONIC DISCRETE variable AUTOMATIC COMPUTER)二、微型計算機的應用形態 從應用形態上,微機可以分成三種:
標簽: 51單片機
上傳時間: 2013-12-20
上傳用戶:d815185728
項目描述: 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 是一個為媒體流提供的服務器后臺。最新版本建造為一個API,用于建造任何類型的媒體。服務器是流式MP3文件的一個插件,即使其位率可變。現在也支持組播。 來源: http://sourceforge.net/projects/fluid/
標簽: for streaming release daemon
上傳時間: 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.
標簽: the Analyzer Compiler project
上傳時間: 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.
標簽: instructions appletviewer the commands
上傳時間: 2015-06-01
上傳用戶:3到15
最優化算法,應用有限內存擬牛頓方法(Limited Memory (variable-storage)quasi-Newton method)求解高維最優化問題,使用更多的內存將使算法更有效。
標簽: 優化算法
上傳時間: 2015-08-08
上傳用戶:cuiyashuo
三次樣條插值程序。編譯運行本程序后,程序會彈出窗口及問句:“input the number of intervals:”,輸入插值的次數即可,程序將得到的次數保存在變量int n中。如果輸入的插值次數正確(n>=2),程序會顯示下一語句:"input the value of the variable:",此時輸入插值點即可,程序將得到的插值點保存在變量double v中。若插值點正確(v>=0&&v<=6),則程序將輸出插值結果。
上傳時間: 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.
標簽: relationship nonlinear building function
上傳時間: 2015-10-22
上傳用戶:hzy5825468