【正文】
電流環(huán)小時(shí)間常數(shù)之和T。 圖35表明,電流環(huán)的控制對(duì)象是雙慣性型的,要校正成典型 I 型系統(tǒng),顯然應(yīng)采用PI型的電流調(diào)節(jié)器,其傳遞函數(shù)可以寫成式中 Ki — 電流調(diào)節(jié)器的比例系數(shù); ti — 電流調(diào)節(jié)器的超前時(shí)間常數(shù)。于是,轉(zhuǎn)速反饋系數(shù)的計(jì)算結(jié)果是 α=α2Cetg== V min/r 為了使測(cè)速發(fā)電機(jī)的電樞電壓降對(duì)轉(zhuǎn)速檢測(cè)信號(hào)的線性度沒有顯著的影響,取測(cè)速發(fā)電機(jī)轉(zhuǎn)速輸出最高電壓時(shí),其電流約為額定值的20%,則 RRP2==1875Ω此時(shí)RP2消耗的功率為 W=nCetg=1500=為了不致使電位器溫度很高,實(shí)選電位器的瓦數(shù)應(yīng)為所消耗功率一倍以上,故可將RP2選為10W,。直流電源給定值177。雙閉環(huán)調(diào)速系統(tǒng)的實(shí)際動(dòng)態(tài)結(jié)構(gòu)框圖如圖2-所示,它包括了電流濾波,轉(zhuǎn)速濾波和給定信號(hào)的濾波環(huán)節(jié)。 這樣構(gòu)成的雙閉環(huán)直流調(diào)速系統(tǒng)的電路原理圖示于下圖33。穩(wěn)態(tài)時(shí),只有轉(zhuǎn)速負(fù)反饋,沒有電流負(fù)反饋。其系統(tǒng)的組成框圖如圖2-2所示。圖中和分別表示轉(zhuǎn)速調(diào)節(jié)器和電流調(diào)節(jié)器的傳遞函數(shù)。圖中兩個(gè)調(diào)節(jié)器ASR和ACR分別為轉(zhuǎn)速調(diào)節(jié)器和電流調(diào)節(jié)器,二者串級(jí)連接,即把轉(zhuǎn)速調(diào)節(jié)器的輸出作為電流調(diào)節(jié)器的輸入,再用電流調(diào)節(jié)器的輸出去控制晶閘管整流器的觸發(fā)裝置。要實(shí)現(xiàn)上述要求,其唯一的途徑就是采用電流負(fù)反饋控制方法,即采用速度、電流雙閉環(huán)的調(diào)速系統(tǒng)來實(shí)現(xiàn)。動(dòng)態(tài)設(shè)計(jì)計(jì)算:根據(jù)技術(shù)要求,對(duì)系統(tǒng)進(jìn)行動(dòng)態(tài)校正,確定ASR調(diào)節(jié)器與ACR調(diào)節(jié)器的結(jié)構(gòu)型式及進(jìn)行參數(shù)計(jì)算,使調(diào)速系統(tǒng)工作穩(wěn)定,并滿足動(dòng)態(tài)性能指標(biāo)的要求 。(2)主回路參數(shù)計(jì)算選擇。畢業(yè)設(shè)計(jì)(論文)雙閉環(huán)直流調(diào)速系統(tǒng)設(shè)計(jì)雙閉環(huán)直流調(diào)速系統(tǒng)設(shè)計(jì)摘 要本文對(duì)微機(jī)控制的直流調(diào)速系統(tǒng)進(jìn)行了較深入的研究,從直流調(diào)速系統(tǒng)的原理出發(fā),建立了雙閉環(huán)直流調(diào)速系統(tǒng)的數(shù)學(xué)模型,用MATLAB進(jìn)行系統(tǒng)仿真,實(shí)現(xiàn)了控制器參數(shù)整定。關(guān)鍵詞:微機(jī)控制,雙閉環(huán),直流調(diào)速,數(shù)字信號(hào)處理器The Design of the Double Closed LoopsDC Timing System ControllerAbstractIn this paper, DC timing system controlled by microputer had been researched deeply. Beginning with the theory of the DC timing system, the math model of the double closed loops DC timing system had been build up, the controller parameter had been adjusted after the system had been simulated with MATLAB, Based on the result of the simulation, digital signal processor (DSP) is taken as the controller, the design of the double closed loops timing system of the DC motor has been realized through the design of the system’s hardware and software. The result shows that this timing system has strong robust.Keywords: microputer control, double closed loops, DC timing, DSP第一章 緒論 研究背景和意義 國內(nèi)外研究現(xiàn)狀和應(yīng)用前景 本研究課題的主