ABB–SNAT617CHC

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描述

ABB–SNAT617CHC

在電力拖動(dòng)的發(fā)展歷史中,交流與直流拖動(dòng)兩種方式始終并存于工業(yè)領(lǐng)域中。伴隨著科學(xué)發(fā)展的進(jìn)程,它們相互競爭,相互促進(jìn),推動(dòng)電力拖動(dòng)歷史的發(fā)展。
? ? 在19世紀(jì)80年代以前,利用蓄電池的直流拖動(dòng)系統(tǒng)占統(tǒng)治地位。80年代后,隨著三相交流電的傳輸方式的應(yīng)用而產(chǎn)生籠型交流電動(dòng)機(jī),并很快在工業(yè)生產(chǎn)及人民生活的各個(gè)領(lǐng)域獲得廣泛的應(yīng)用,并占據(jù)主要地位。之后,隨著科技的發(fā)展,對拖動(dòng)系統(tǒng)提出更高的要求,特別是在精密機(jī)械、冶金、國防工業(yè)等方面,要求調(diào)速精度高、調(diào)速范圍寬、動(dòng)態(tài)性能好,起制動(dòng)靈活等,交流拖動(dòng)則難以滿足以上要求。因此,過去很長一段時(shí)期,在高性能的電力拖動(dòng)系統(tǒng)中,一直是直流拖動(dòng)占主要地位。然而交流電動(dòng)機(jī)與直流電動(dòng)機(jī)相比,也具有很多明顯的優(yōu)點(diǎn)。
? ? (1)交流電動(dòng)機(jī)不存在換向器的轉(zhuǎn)動(dòng)速度限制,也不存在電樞元件的電抗電勢限制,其轉(zhuǎn)速可以設(shè)計(jì)得比相同功率的直流電動(dòng)機(jī)轉(zhuǎn)速更高。
? ? (2)直流電動(dòng)機(jī)的電樞電流電壓的值受換向器的限制,交流電動(dòng)機(jī)則無此限制,它的單機(jī)功率可以比直流電動(dòng)機(jī)更大。
? ? (3)直流電動(dòng)機(jī)換向器制作工藝復(fù)雜、成本較高,相比之,交流電動(dòng)機(jī)則成本低廉。
? ? (4)直流電動(dòng)機(jī)高速運(yùn)行時(shí),由于受電抗電勢的限制,一般最高速時(shí)(額定轉(zhuǎn)速以上),輸出功率僅能達(dá)到額定功率的80%,交流電動(dòng)機(jī)則不受限制,它可以在高速時(shí)以額定功率運(yùn)行。
? ? (5)交流電動(dòng)機(jī)無換向器之類經(jīng)常需要保養(yǎng)維護(hù)的部分。維護(hù)方便,經(jīng)久耐用。在某些惡劣的環(huán)境下,例如,易燃易爆場合,也能可靠工作。
? ? (6)直流拖動(dòng)系統(tǒng)的控制設(shè)備復(fù)雜、機(jī)構(gòu)龐大、造價(jià)高。而某些簡單的交流調(diào)速系統(tǒng)(特別是現(xiàn)在大量使用的變頻器的調(diào)速系統(tǒng))則具有設(shè)備簡單、造價(jià)低、維護(hù)方便的優(yōu)點(diǎn)。
? ? (7)現(xiàn)在大量使用的變頻器調(diào)速系統(tǒng)在節(jié)能方面有明顯的優(yōu)勢(特別是在風(fēng)機(jī)、泵類方面的應(yīng)用中)。
? ? 由于交流拖動(dòng)具有以上優(yōu)點(diǎn),過去在一些性能要求不高的場合,仍有人愿意采用交流電動(dòng)機(jī)調(diào)速,以求得體積小、系統(tǒng)簡單、維護(hù)方便的優(yōu)點(diǎn)。近年來,隨著電子計(jì)算機(jī)的發(fā)展及新型電力電子器件的出現(xiàn),使交流變頻器調(diào)速方式獲得廣泛應(yīng)用,許多過去采用直流電動(dòng)機(jī)的精密設(shè)備、大型設(shè)備,現(xiàn)在改用交流拖動(dòng)的例子不勝枚舉。目前已有逐漸取代直流拖動(dòng)的趨勢。

產(chǎn)品承諾:
保?證?全新原裝進(jìn)口,
保?證?安全準(zhǔn)時(shí)發(fā)貨,
保?證售后服務(wù)質(zhì)量,
優(yōu)勢價(jià)格,大量現(xiàn)貨。

主營DCS系統(tǒng)配件
機(jī)器人系統(tǒng)配件
大型伺服系統(tǒng)配件
品牌:ABB???,AB??,GE,FOXBORO,本特利,英維思,伍德沃德,西屋,瑞恩,施耐德,西門子,摩托羅拉,安川。力士樂。ACSO,橫河等進(jìn)口品牌。Triconex?Siemens?Yaskawa?ABB?GE?Ovation?AB?Foxboro?Motorola?Schneider?XYCOM?KUKA

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Enlarge
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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,福克斯波羅、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(gè)大概,以便學(xué)習(xí)編程時(shí)查找);
2、由位控邏輯入手,逐漸增加定時(shí)、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(gè)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(shí)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(dòng)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。