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18.5KW運行(xing)電(dian)(dian)(dian)流(liu)算(suan)36A吧，那(nei)(nei)么直接啟(qi)動(dong)(dong)(dong)的(de)(de)啟(qi)動(dong)(dong)(dong)電(dian)(dian)(dian)流(liu)按(an)5倍來算(suan)，也(ye)是(shi)160A吧，160A的(de)(de)短時間(jian)(jian)可(ke)能會(hui)(hui)給電(dian)(dian)(dian)網造成很嚴重的(de)(de)后果，也(ye)許(xu)會(hui)(hui)跳(tiao)閘(zha)，電(dian)(dian)(dian)壓不足(zu)，燒(shao)毀變壓器，功率小一點啟(qi)動(dong)(dong)(dong)電(dian)(dian)(dian)流(liu)就小了很多(duo)，按(an)照常理來說(shuo)的(de)(de)話(hua)。15KW以上就應該是(shi)星三(san)角了，超(chao)過了45KW用星三(san)角可(ke)能都不能達(da)到要求(qiu)了，啟(qi)動(dong)(dong)(dong)電(dian)(dian)(dian)流(liu)太大了也(ye)會(hui)(hui)損(sun)壞(huai)電(dian)(dian)(dian)機(ji)，線圈如果是(shi)3mm的(de)(de)話(hua)，那(nei)(nei)么啟(qi)動(dong)(dong)(dong)是(shi)，能承(cheng)受160A的(de)(de)電(dian)(dian)(dian)流(liu)嗎，18.5KW以上的(de)(de)電(dian)(dian)(dian)機(ji)，啟(qi)動(dong)(dong)(dong)時間(jian)(jian)最少3S，3S的(de)(de)時間(jian)(jian)，能頂得住不哇

1.當負(fu)載對電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)動(dong)(dong)(dong)機(ji)(ji)(ji)(ji)啟(qi)(qi)(qi)(qi)(qi)(qi)(qi)動(dong)(dong)(dong)力(li)(li)矩無(wu)嚴格要(yao)(yao)(yao)求又要(yao)(yao)(yao)限制電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)動(dong)(dong)(dong)機(ji)(ji)(ji)(ji)啟(qi)(qi)(qi)(qi)(qi)(qi)(qi)動(dong)(dong)(dong)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)流且電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)機(ji)(ji)(ji)(ji)滿足(zu)380V/Δ接(jie)線(xian)條件才能(neng)采用(yong)(yong)(yong)星三角(jiao)啟(qi)(qi)(qi)(qi)(qi)(qi)(qi)動(dong)(dong)(dong)方(fang)法；2.該方(fang)法是(shi)：在(zai)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)機(ji)(ji)(ji)(ji)啟(qi)(qi)(qi)(qi)(qi)(qi)(qi)動(dong)(dong)(dong)時(shi)將電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)機(ji)(ji)(ji)(ji)接(jie)成星型接(jie)線(xian),當電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)機(ji)(ji)(ji)(ji)啟(qi)(qi)(qi)(qi)(qi)(qi)(qi)動(dong)(dong)(dong)成功(gong)后再將電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)機(ji)(ji)(ji)(ji)改接(jie)成三角(jiao)型接(jie)線(xian)（通過(guo)雙投開(kai)關迅速(su)切(qie)換(huan)）；3.因電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)機(ji)(ji)(ji)(ji)啟(qi)(qi)(qi)(qi)(qi)(qi)(qi)動(dong)(dong)(dong)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)流與電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)源(yuan)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)壓(ya)(ya)成正(zheng)比,此時(shi)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)網(wang)提供的(de)(de)(de)啟(qi)(qi)(qi)(qi)(qi)(qi)(qi)動(dong)(dong)(dong)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)流只有全(quan)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)壓(ya)(ya)啟(qi)(qi)(qi)(qi)(qi)(qi)(qi)動(dong)(dong)(dong)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)流的(de)(de)(de)1/3 ，但啟(qi)(qi)(qi)(qi)(qi)(qi)(qi)動(dong)(dong)(dong)力(li)(li)矩也只有全(quan)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)壓(ya)(ya)啟(qi)(qi)(qi)(qi)(qi)(qi)(qi)動(dong)(dong)(dong)力(li)(li)矩的(de)(de)(de)1/3。星三角(jiao)啟(qi)(qi)(qi)(qi)(qi)(qi)(qi)動(dong)(dong)(dong)，屬降壓(ya)(ya)啟(qi)(qi)(qi)(qi)(qi)(qi)(qi)動(dong)(dong)(dong)他是(shi)以(yi)犧牲功(gong)率為(wei)代(dai)價(jia)來(lai)換(huan)取(qu)降低啟(qi)(qi)(qi)(qi)(qi)(qi)(qi)動(dong)(dong)(dong)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)流來(lai)實(shi)現的(de)(de)(de)。所(suo)以(yi)不能(neng)一(yi)(yi)概而以(yi)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)機(ji)(ji)(ji)(ji)功(gong)率的(de)(de)(de)大(da)(da)小來(lai)確定(ding)是(shi)否需采用(yong)(yong)(yong)星三角(jiao)啟(qi)(qi)(qi)(qi)(qi)(qi)(qi)動(dong)(dong)(dong)，還的(de)(de)(de)看(kan)是(shi)什么樣的(de)(de)(de)負(fu)載，一(yi)(yi)般在(zai)需要(yao)(yao)(yao)啟(qi)(qi)(qi)(qi)(qi)(qi)(qi)動(dong)(dong)(dong)時(shi)負(fu)載輕(qing)運行時(shi)負(fu)載重尚(shang)可采用(yong)(yong)(yong)星三角(jiao)啟(qi)(qi)(qi)(qi)(qi)(qi)(qi)動(dong)(dong)(dong)，一(yi)(yi)般情況下鼠籠型電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)機(ji)(ji)(ji)(ji)的(de)(de)(de)啟(qi)(qi)(qi)(qi)(qi)(qi)(qi)動(dong)(dong)(dong)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)流是(shi)運行電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)流的(de)(de)(de)5—7倍(bei)(bei)，而對電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)網(wang)的(de)(de)(de)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)壓(ya)(ya)要(yao)(yao)(yao)求一(yi)(yi)般是(shi)正(zheng)負(fu)10%（我記憶中）為(wei)了(le)不形成對電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)網(wang)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)壓(ya)(ya)過(guo)大(da)(da)的(de)(de)(de)沖(chong)擊所(suo)以(yi)要(yao)(yao)(yao)采用(yong)(yong)(yong)星三角(jiao)啟(qi)(qi)(qi)(qi)(qi)(qi)(qi)動(dong)(dong)(dong)，一(yi)(yi)般要(yao)(yao)(yao)求在(zai)鼠籠型電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)機(ji)(ji)(ji)(ji)的(de)(de)(de)功(gong)率超過(guo)變壓(ya)(ya)器(qi)(qi)(qi)額(e)定(ding)功(gong)率的(de)(de)(de)10%時(shi)就要(yao)(yao)(yao)采用(yong)(yong)(yong)星三角(jiao)啟(qi)(qi)(qi)(qi)(qi)(qi)(qi)動(dong)(dong)(dong)。只有鼠籠型電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)機(ji)(ji)(ji)(ji)才采用(yong)(yong)(yong)星三角(jiao)啟(qi)(qi)(qi)(qi)(qi)(qi)(qi)動(dong)(dong)(dong)。一(yi)(yi)家之(zhi)言,姑且聽之(zhi).本(ben)人在(zai)實(shi)際使用(yong)(yong)(yong)過(guo)程中,發現需星三角(jiao)降壓(ya)(ya)啟(qi)(qi)(qi)(qi)(qi)(qi)(qi)動(dong)(dong)(dong)的(de)(de)(de)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)機(ji)(ji)(ji)(ji)從11KW開(kai)始就有需要(yao)(yao)(yao)的(de)(de)(de),如風(feng)機(ji)(ji)(ji)(ji)、在(zai)啟(qi)(qi)(qi)(qi)(qi)(qi)(qi)動(dong)(dong)(dong)時(shi)11KW電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)流在(zai)7-9倍(bei)(bei)(100)A左(zuo)右(you),按正(zheng)常配置的(de)(de)(de)熱繼電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)器(qi)(qi)(qi)根本(ben)啟(qi)(qi)(qi)(qi)(qi)(qi)(qi)動(dong)(dong)(dong)不了(le),（關風(feng)門也沒用(yong)(yong)(yong)）熱繼電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)器(qi)(qi)(qi)配大(da)(da)了(le)又起不了(le)保(bao)護電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)機(ji)(ji)(ji)(ji)的(de)(de)(de)作(zuo)用(yong)(yong)(yong)，所(suo)以(yi)建議(yi)用(yong)(yong)(yong)降壓(ya)(ya)啟(qi)(qi)(qi)(qi)(qi)(qi)(qi)動(dong)(dong)(dong)。而在(zai)一(yi)(yi)些啟(qi)(qi)(qi)(qi)(qi)(qi)(qi)動(dong)(dong)(dong)負(fu)荷較(jiao)小的(de)(de)(de)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)機(ji)(ji)(ji)(ji)上，由(you)于電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)機(ji)(ji)(ji)(ji)到(dao)達恒速(su)時(shi)間短，啟(qi)(qi)(qi)(qi)(qi)(qi)(qi)動(dong)(dong)(dong)時(shi)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)流沖(chong)擊影(ying)響較(jiao)小，所(suo)以(yi)在(zai)30KW左(zuo)右(you)的(de)(de)(de)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)機(ji)(ji)(ji)(ji)，選用(yong)(yong)(yong)1.5倍(bei)(bei)額(e)定(ding)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)流的(de)(de)(de)斷路器(qi)(qi)(qi)直(zhi)接(jie)啟(qi)(qi)(qi)(qi)(qi)(qi)(qi)動(dong)(dong)(dong)，長期工作(zuo)一(yi)(yi)點問題都沒有。

是(shi)pcl控制的星三(san)角啟動(dong)，啟動(dong)時(shi)電(dian)壓降的多繼電(dian)器吸合不好，接觸器打火怎(zen)么處(chu)   

可以裝個變頻器

45KW的電(dian)動機用什么方式(shi)啟(qi)動好

最(zui)好：使用變(bian)頻器(qi)(qi)變(bian)頻降壓啟(qi)動(dong)(dong)，可變(bian)速，安全。其次(ci)：使用軟啟(qi)動(dong)(dong)器(qi)(qi)啟(qi)動(dong)(dong)，安全啟(qi)動(dong)(dong)。最(zui)次(ci)：星(xing)角啟(qi)動(dong)(dong)。追問(wen)用多大的(de)(de)空(kong)開和接觸器(qi)(qi) 回答1.變(bian)頻，斷(duan)路(lu)器(qi)(qi)：100A塑(su)殼，接觸器(qi)(qi)：95A。2.軟啟(qi)，斷(duan)路(lu)器(qi)(qi)：100A塑(su)殼，接觸器(qi)(qi)：95A。3.星(xing)角，斷(duan)路(lu)器(qi)(qi)：100A塑(su)殼，接觸器(qi)(qi)：2個(ge)95A和1個(ge)65A的(de)(de)。這是好牌子（施(shi)耐德(de)、ABB等(deng)）的(de)(de)選(xuan)型，其他牌（正泰、德(de)力西、各種人民等(deng)）都大一檔或者選(xuan)擇性的(de)(de)乘(cheng)以1.2-1.5/