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描述

熱電式儀表是使被測電流通過熱絲,根據(jù)熱絲產(chǎn)生的溫度來進(jìn)行測量的,其測量結(jié)果與被測電流儀表的平方成正比,因此這種儀表在測量非正弦量時其測量結(jié)果為包含諧波電流在內(nèi)的被測電流的有效值。
? ? 電動式儀表數(shù)字電壓表電子設(shè)備這種儀表主要用于測量電功率,由于高次諧波電流與基波電壓乘箕的平均值為零,因此這種儀表的指針偏角只和有功功率(基波電流的功率成政比,其受諧波的影響不大。
? ? 數(shù)字電壓表是通過對被測電壓進(jìn)行采樣和模數(shù)轉(zhuǎn)換來進(jìn)行測量的,它的采樣元件和模數(shù)轉(zhuǎn)換元件的工作頻率都是按工頻電壓來設(shè)計(jì)的,其所采樣都是系列脈沖的峰值。若用數(shù)字電壓表測量變頻器的輸出側(cè)電壓,由于變頻器的輸出電壓是經(jīng)卜調(diào)制過的系列脈沖波,電壓的平均值是通過改變脈沖間的占空比來進(jìn)行調(diào)節(jié)的,的調(diào)制頻率為一這樣就會造成數(shù)字電壓表的采樣和模數(shù)轉(zhuǎn)換工作的紊亂,因而在這種情況下的測量是不準(zhǔn)確的。
? ? 當(dāng)變頻調(diào)速系統(tǒng)的容量足夠大時,所產(chǎn)生的高頻信號通過輻射電磁感應(yīng)靜電感應(yīng)線路傳播的方式對周圍各種電子設(shè)備形成干擾,如影響無線電設(shè)備的正常接受,影響周圍電子設(shè)備的正常工作,使他們誤接受信號而產(chǎn)生誤動作,或影響傳感器電路的檢測而引起錯誤判斷等。
?嚴(yán)格地講,不能簡單地把網(wǎng)側(cè)變流器稱為“整流器”,因?yàn)樗瓤梢宰鳛檎髌鞴ぷ?,又可以作為逆變器工作。由于采用了自關(guān)斷器件,通過恰當(dāng)?shù)膒wm模式,可對交流電流的大小和相位進(jìn)行控制,使輸入電流接近正弦波,并使系統(tǒng)的功率因數(shù)總是接近于1。當(dāng)電動機(jī)減速制動從逆變器返回的再生功率使直流電壓升高時,可以使交流輸入電流的相位與電源電壓相位相反,以實(shí)現(xiàn)再生運(yùn)行,并將再生功率回饋到交流電網(wǎng)去,系統(tǒng)仍能將直流電壓保持在給定值上。這種情況下,網(wǎng)側(cè)變流器工作在有源逆變狀態(tài)。這樣就容易實(shí)現(xiàn)功率的雙向流
? ? 動,且具有很快的動態(tài)響應(yīng)速度,同時這樣的拓?fù)浣Y(jié)構(gòu)使得系統(tǒng)能夠完全控制交流側(cè)和直流側(cè)之間的無功和有功功率的交換,且效率可高達(dá)97%,經(jīng)濟(jì)效益較大,熱損耗為能耗制動的
? ? 1%,同時不污染電網(wǎng),功率因數(shù)約等于1,具有綠色環(huán)保的特點(diǎn)。所以,回饋制動可廣泛應(yīng)用于pwm交流傳動的能量回饋制動場合的節(jié)能運(yùn)行,特別適用于需要頻繁制動的場合,電動機(jī)的功率也較大,這時節(jié)電效果明顯,按運(yùn)行的工況條件不同,平均約有20%的省電效果。實(shí)現(xiàn)回饋控制的唯一不足是控制系統(tǒng)結(jié)構(gòu)復(fù)雜。

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選擇深圳長欣,選擇放心,售后無憂大量現(xiàn)貨,當(dāng)天順豐發(fā)貨!
主營:本特利,英維思,伍德沃德,??怂共_、西屋、瑞恩、施耐德莫迪康、ABB、AB、西門子、摩托羅拉、GE發(fā)那科、安川、博世力士樂,ACSO,力士樂等各大品牌的DCS系統(tǒng)配件,機(jī)器人系統(tǒng)配件,大型伺服系統(tǒng)備件。

先介紹幾點(diǎn)經(jīng)驗(yàn)。
1、先通讀一遍“系統(tǒng)手冊”(不管能不能看懂,先了解個大概,以便學(xué)習(xí)編程時查找);
2、由位控邏輯入手,逐漸增加定時、計(jì)數(shù)等條件,把或、與、非關(guān)系理順;
3、進(jìn)而練習(xí)整數(shù)運(yùn)算、實(shí)數(shù)運(yùn)算、類型轉(zhuǎn)換;
4、量程轉(zhuǎn)換、PID調(diào)節(jié)回路的建立及P、I、D參數(shù)的理解(最好是有個物理回路驗(yàn)證,比如變頻器+電機(jī)+測速傳感器);
5、循環(huán)、順序、跳轉(zhuǎn)等程序控制(盡量避免跳轉(zhuǎn),非跳不可時也是跳的越近越好);
6、中斷、通訊、位置控制....

本人以ABB工業(yè)機(jī)器人配件DSQC系列和Motorola MVME系列,GE 卡件 模塊 驅(qū)動器系列為主攻。各位電工朋友可根據(jù)自己的條件選擇適合自己的PLC品牌,由于PLC的基本框架大同小異,學(xué)會一種至于其它的學(xué)習(xí)起來也就簡單了。