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18.5KW運行電(dian)流(liu)算36A吧，那(nei)么直接(jie)啟動(dong)(dong)的(de)啟動(dong)(dong)電(dian)流(liu)按5倍來(lai)算，也是(shi)160A吧，160A的(de)短時(shi)間可(ke)(ke)能會(hui)給電(dian)網(wang)造成很嚴重(zhong)的(de)后果(guo)，也許會(hui)跳閘，電(dian)壓不足(zu)，燒毀變壓器，功率(lv)小一點啟動(dong)(dong)電(dian)流(liu)就小了很多，按照常理來(lai)說(shuo)的(de)話(hua)。15KW以上就應(ying)該是(shi)星(xing)三角了，超過了45KW用(yong)星(xing)三角可(ke)(ke)能都(dou)不能達(da)到要求了，啟動(dong)(dong)電(dian)流(liu)太(tai)大了也會(hui)損壞電(dian)機，線圈(quan)如果(guo)是(shi)3mm的(de)話(hua)，那(nei)么啟動(dong)(dong)是(shi)，能承受160A的(de)電(dian)流(liu)嗎，18.5KW以上的(de)電(dian)機，啟動(dong)(dong)時(shi)間最(zui)少3S，3S的(de)時(shi)間，能頂得住不哇

1.當負載(zai)對(dui)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)動(dong)(dong)(dong)(dong)(dong)(dong)(dong)機(ji)(ji)(ji)啟(qi)(qi)(qi)動(dong)(dong)(dong)(dong)(dong)(dong)(dong)力矩無(wu)嚴格要(yao)(yao)求又(you)要(yao)(yao)限制電(dian)(dian)(dian)(dian)(dian)(dian)(dian)動(dong)(dong)(dong)(dong)(dong)(dong)(dong)機(ji)(ji)(ji)啟(qi)(qi)(qi)動(dong)(dong)(dong)(dong)(dong)(dong)(dong)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)流(liu)(liu)(liu)(liu)且(qie)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)機(ji)(ji)(ji)滿足380V/Δ接線條件才能采(cai)(cai)(cai)用(yong)星三角(jiao)(jiao)(jiao)啟(qi)(qi)(qi)動(dong)(dong)(dong)(dong)(dong)(dong)(dong)方法；2.該方法是(shi)(shi)：在(zai)(zai)(zai)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)機(ji)(ji)(ji)啟(qi)(qi)(qi)動(dong)(dong)(dong)(dong)(dong)(dong)(dong)時將(jiang)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)機(ji)(ji)(ji)接成星型(xing)接線,當電(dian)(dian)(dian)(dian)(dian)(dian)(dian)機(ji)(ji)(ji)啟(qi)(qi)(qi)動(dong)(dong)(dong)(dong)(dong)(dong)(dong)成功(gong)后(hou)再將(jiang)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)機(ji)(ji)(ji)改接成三角(jiao)(jiao)(jiao)型(xing)接線（通(tong)過(guo)雙(shuang)投開關(guan)迅速(su)切換）；3.因電(dian)(dian)(dian)(dian)(dian)(dian)(dian)機(ji)(ji)(ji)啟(qi)(qi)(qi)動(dong)(dong)(dong)(dong)(dong)(dong)(dong)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)流(liu)(liu)(liu)(liu)與電(dian)(dian)(dian)(dian)(dian)(dian)(dian)源電(dian)(dian)(dian)(dian)(dian)(dian)(dian)壓成正比,此時電(dian)(dian)(dian)(dian)(dian)(dian)(dian)網(wang)提供的(de)(de)(de)(de)(de)啟(qi)(qi)(qi)動(dong)(dong)(dong)(dong)(dong)(dong)(dong)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)流(liu)(liu)(liu)(liu)只(zhi)(zhi)有全電(dian)(dian)(dian)(dian)(dian)(dian)(dian)壓啟(qi)(qi)(qi)動(dong)(dong)(dong)(dong)(dong)(dong)(dong)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)流(liu)(liu)(liu)(liu)的(de)(de)(de)(de)(de)1/3 ，但啟(qi)(qi)(qi)動(dong)(dong)(dong)(dong)(dong)(dong)(dong)力矩也只(zhi)(zhi)有全電(dian)(dian)(dian)(dian)(dian)(dian)(dian)壓啟(qi)(qi)(qi)動(dong)(dong)(dong)(dong)(dong)(dong)(dong)力矩的(de)(de)(de)(de)(de)1/3。星三角(jiao)(jiao)(jiao)啟(qi)(qi)(qi)動(dong)(dong)(dong)(dong)(dong)(dong)(dong)，屬降壓啟(qi)(qi)(qi)動(dong)(dong)(dong)(dong)(dong)(dong)(dong)他是(shi)(shi)以犧牲功(gong)率為(wei)(wei)代(dai)價來(lai)換取降低啟(qi)(qi)(qi)動(dong)(dong)(dong)(dong)(dong)(dong)(dong)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)流(liu)(liu)(liu)(liu)來(lai)實現的(de)(de)(de)(de)(de)。所以不(bu)(bu)能一(yi)概(gai)而(er)以電(dian)(dian)(dian)(dian)(dian)(dian)(dian)機(ji)(ji)(ji)功(gong)率的(de)(de)(de)(de)(de)大(da)(da)小來(lai)確定是(shi)(shi)否需(xu)采(cai)(cai)(cai)用(yong)星三角(jiao)(jiao)(jiao)啟(qi)(qi)(qi)動(dong)(dong)(dong)(dong)(dong)(dong)(dong)，還(huan)的(de)(de)(de)(de)(de)看是(shi)(shi)什么樣的(de)(de)(de)(de)(de)負載(zai)，一(yi)般(ban)(ban)在(zai)(zai)(zai)需(xu)要(yao)(yao)啟(qi)(qi)(qi)動(dong)(dong)(dong)(dong)(dong)(dong)(dong)時負載(zai)輕運(yun)行時負載(zai)重(zhong)尚可采(cai)(cai)(cai)用(yong)星三角(jiao)(jiao)(jiao)啟(qi)(qi)(qi)動(dong)(dong)(dong)(dong)(dong)(dong)(dong)，一(yi)般(ban)(ban)情況下鼠(shu)籠(long)型(xing)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)機(ji)(ji)(ji)的(de)(de)(de)(de)(de)啟(qi)(qi)(qi)動(dong)(dong)(dong)(dong)(dong)(dong)(dong)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)流(liu)(liu)(liu)(liu)是(shi)(shi)運(yun)行電(dian)(dian)(dian)(dian)(dian)(dian)(dian)流(liu)(liu)(liu)(liu)的(de)(de)(de)(de)(de)5—7倍，而(er)對(dui)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)網(wang)的(de)(de)(de)(de)(de)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)壓要(yao)(yao)求一(yi)般(ban)(ban)是(shi)(shi)正負10%（我記憶(yi)中）為(wei)(wei)了(le)不(bu)(bu)形成對(dui)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)網(wang)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)壓過(guo)大(da)(da)的(de)(de)(de)(de)(de)沖擊(ji)所以要(yao)(yao)采(cai)(cai)(cai)用(yong)星三角(jiao)(jiao)(jiao)啟(qi)(qi)(qi)動(dong)(dong)(dong)(dong)(dong)(dong)(dong)，一(yi)般(ban)(ban)要(yao)(yao)求在(zai)(zai)(zai)鼠(shu)籠(long)型(xing)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)機(ji)(ji)(ji)的(de)(de)(de)(de)(de)功(gong)率超過(guo)變壓器(qi)額定功(gong)率的(de)(de)(de)(de)(de)10%時就(jiu)要(yao)(yao)采(cai)(cai)(cai)用(yong)星三角(jiao)(jiao)(jiao)啟(qi)(qi)(qi)動(dong)(dong)(dong)(dong)(dong)(dong)(dong)。只(zhi)(zhi)有鼠(shu)籠(long)型(xing)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)機(ji)(ji)(ji)才采(cai)(cai)(cai)用(yong)星三角(jiao)(jiao)(jiao)啟(qi)(qi)(qi)動(dong)(dong)(dong)(dong)(dong)(dong)(dong)。一(yi)家之言(yan),姑且(qie)聽之.本(ben)(ben)人在(zai)(zai)(zai)實際使(shi)用(yong)過(guo)程中,發現需(xu)星三角(jiao)(jiao)(jiao)降壓啟(qi)(qi)(qi)動(dong)(dong)(dong)(dong)(dong)(dong)(dong)的(de)(de)(de)(de)(de)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)機(ji)(ji)(ji)從11KW開始就(jiu)有需(xu)要(yao)(yao)的(de)(de)(de)(de)(de),如風(feng)機(ji)(ji)(ji)、在(zai)(zai)(zai)啟(qi)(qi)(qi)動(dong)(dong)(dong)(dong)(dong)(dong)(dong)時11KW電(dian)(dian)(dian)(dian)(dian)(dian)(dian)流(liu)(liu)(liu)(liu)在(zai)(zai)(zai)7-9倍(100)A左右,按正常配置(zhi)的(de)(de)(de)(de)(de)熱(re)繼電(dian)(dian)(dian)(dian)(dian)(dian)(dian)器(qi)根本(ben)(ben)啟(qi)(qi)(qi)動(dong)(dong)(dong)(dong)(dong)(dong)(dong)不(bu)(bu)了(le),（關(guan)風(feng)門也沒用(yong)）熱(re)繼電(dian)(dian)(dian)(dian)(dian)(dian)(dian)器(qi)配大(da)(da)了(le)又(you)起不(bu)(bu)了(le)保護電(dian)(dian)(dian)(dian)(dian)(dian)(dian)機(ji)(ji)(ji)的(de)(de)(de)(de)(de)作(zuo)用(yong)，所以建議(yi)用(yong)降壓啟(qi)(qi)(qi)動(dong)(dong)(dong)(dong)(dong)(dong)(dong)。而(er)在(zai)(zai)(zai)一(yi)些啟(qi)(qi)(qi)動(dong)(dong)(dong)(dong)(dong)(dong)(dong)負荷較小的(de)(de)(de)(de)(de)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)機(ji)(ji)(ji)上，由于電(dian)(dian)(dian)(dian)(dian)(dian)(dian)機(ji)(ji)(ji)到達恒速(su)時間短，啟(qi)(qi)(qi)動(dong)(dong)(dong)(dong)(dong)(dong)(dong)時電(dian)(dian)(dian)(dian)(dian)(dian)(dian)流(liu)(liu)(liu)(liu)沖擊(ji)影響較小，所以在(zai)(zai)(zai)30KW左右的(de)(de)(de)(de)(de)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)機(ji)(ji)(ji)，選用(yong)1.5倍額定電(dian)(dian)(dian)(dian)(dian)(dian)(dian)流(liu)(liu)(liu)(liu)的(de)(de)(de)(de)(de)斷路(lu)器(qi)直接啟(qi)(qi)(qi)動(dong)(dong)(dong)(dong)(dong)(dong)(dong)，長期工作(zuo)一(yi)點問題都沒有。

是pcl控制的星(xing)三(san)角啟(qi)動(dong)，啟(qi)動(dong)時電壓降的多繼電器吸合不好(hao)，接觸器打火怎(zen)么處   

可以裝個變頻器

45KW的電動機用什么方式啟(qi)動好

最好(hao)：使用變頻(pin)器變頻(pin)降壓啟(qi)動，可變速，安全。其次：使用軟啟(qi)動器啟(qi)動，安全啟(qi)動。最次：星角(jiao)啟(qi)動。追問用多大的(de)空開和(he)接(jie)觸(chu)(chu)器 回答1.變頻(pin)，斷(duan)路(lu)器：100A塑殼(ke)(ke)，接(jie)觸(chu)(chu)器：95A。2.軟啟(qi)，斷(duan)路(lu)器：100A塑殼(ke)(ke)，接(jie)觸(chu)(chu)器：95A。3.星角(jiao)，斷(duan)路(lu)器：100A塑殼(ke)(ke)，接(jie)觸(chu)(chu)器：2個(ge)95A和(he)1個(ge)65A的(de)。這(zhe)是好(hao)牌(pai)子（施耐德、ABB等）的(de)選(xuan)型(xing)，其他牌(pai)（正(zheng)泰、德力西、各種(zhong)人民等）都(dou)大一檔或者選(xuan)擇(ze)性的(de)乘以1.2-1.5/