1756-OA8現(xiàn)貨
1756-OA8現(xiàn)貨電力拖動(dòng)方式分獨(dú)立拖動(dòng)和集中拖動(dòng)。電氣傳動(dòng)的趨勢是多電動(dòng)機(jī)拖動(dòng),這不僅能縮短機(jī)械傳動(dòng)鏈,提高傳動(dòng)效率,而且能簡化總體結(jié)構(gòu),便于實(shí)現(xiàn)自動(dòng)化。具體選擇時(shí),可根據(jù)工藝與結(jié)構(gòu)決定電動(dòng)機(jī)的數(shù)量。
大型、重型設(shè)備的主運(yùn)動(dòng)和進(jìn)給運(yùn)動(dòng),應(yīng)盡可能采用無級(jí)調(diào)速,有利于簡化機(jī)械結(jié)構(gòu)、降低成本;精密機(jī)械設(shè)備為保證加工精度也應(yīng)采用無級(jí)調(diào)速;對于一般中小型設(shè)備,在沒有特殊要求時(shí),可選用經(jīng)濟(jì)、簡單、可靠的三相籠型異步電動(dòng)機(jī)
對于恒功率負(fù)載和恒轉(zhuǎn)矩負(fù)載,在選擇電動(dòng)機(jī)調(diào)速方案時(shí),要使電動(dòng)機(jī)的調(diào)速特性與生產(chǎn)機(jī)械的負(fù)載特性相適應(yīng),這樣可以使電動(dòng)機(jī)得到充分合理的應(yīng)用。
正確選擇電動(dòng)機(jī)容量是電動(dòng)機(jī)選擇中的關(guān)鍵問題。電動(dòng)機(jī)容量計(jì)算有兩種方法,一種是分析計(jì)算法,另一種是統(tǒng)計(jì)類比法。分析計(jì)算法是按照機(jī)械功率估計(jì)電動(dòng)機(jī)的工作情況,預(yù)選一臺(tái)電動(dòng)機(jī),然后按照電動(dòng)機(jī)實(shí)際負(fù)載情況做出負(fù)載圖,根據(jù)負(fù)載圖校驗(yàn)溫升情況,確定預(yù)選電動(dòng)機(jī)是否合適,不合適時(shí)再重新選擇,直到電動(dòng)機(jī)合適為止。
熱繼電器是一種利用電流的熱效應(yīng)工作的保護(hù)電器。熱繼電器由發(fā)熱元件(電阻絲)、雙金屬片、傳導(dǎo)部分和常閉觸點(diǎn)組成,當(dāng)電動(dòng)機(jī)過載時(shí),通過熱繼電器中發(fā)熱元件的電流增加,使雙金屬片受熱彎曲,帶動(dòng)常閉觸點(diǎn)動(dòng)作。熱繼電器常用于電動(dòng)機(jī)的長期過載保護(hù)。當(dāng)電動(dòng)機(jī)長期過載時(shí),熱繼電器的常閉觸點(diǎn)動(dòng)作,斷開相應(yīng)的回路,使電動(dòng)機(jī)得到保護(hù)。由于雙金屬片的熱慣性,即不能迅速對短路電流進(jìn)行反應(yīng),而這個(gè)熱慣性也是合乎要求的,因?yàn)樵陔妱?dòng)機(jī)起動(dòng)或短時(shí)間過載時(shí),熱繼電器不會(huì)動(dòng)作,避免了電動(dòng)機(jī)的不必要停車。
過載保護(hù)。逆變器輸出電流超過額定值,且持續(xù)通達(dá)規(guī)定的時(shí)間以上,為了防止逆變器期間、線路等損壞要停止運(yùn)轉(zhuǎn)。恰當(dāng)?shù)谋Wo(hù)需要反時(shí)限特性,采用熱繼電器或者電子熱保護(hù)(使用電子電路)。過負(fù)載是由于負(fù)載的GD(慣性)過大或因負(fù)載過大使電機(jī)堵轉(zhuǎn)而產(chǎn)生的。
瞬時(shí)過電流保護(hù)。由于逆變器負(fù)載側(cè)短路等,流過逆變器器件的電流達(dá)到異常值(超過容許值)時(shí),瞬時(shí)停止逆變器運(yùn)轉(zhuǎn),切斷電流。變流器的輸出電流達(dá)到異常值,也同樣停止逆變器運(yùn)轉(zhuǎn)。
Fu Zhou ZhuoKai Electric Co., Ltd.
公司簡稱:卓凱電子
公司地址:福州市臺(tái)江區(qū)金融街萬達(dá)廣場二期A2#寫字樓11層12室
公司聯(lián)絡(luò)人:李工(銷售工程師)
Tel:0591-62182520
Fax:0591-62032566
Phone:13696852881
商務(wù)QQ:1273632994
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