9、每相串聯導體數

每相(xiang)串(chuan)(chuan)(chuan)(chuan)聯(lian)(lian)(lian)(lian)導體數(shu)(shu)(shu)(shu)是指電(dian)機(ji)(ji)內每相(xiang)繞(rao)(rao)(rao)(rao)(rao)(rao)組(zu)(zu)串(chuan)(chuan)(chuan)(chuan)聯(lian)(lian)(lian)(lian)的總(zong)(zong)線匝(za)(za)數(shu)(shu)(shu)(shu)。不過(guo)該串(chuan)(chuan)(chuan)(chuan)聯(lian)(lian)(lian)(lian)總(zong)(zong)線匝(za)(za)數(shu)(shu)(shu)(shu)與(yu)每相(xiang)繞(rao)(rao)(rao)(rao)(rao)(rao)組(zu)(zu)內的并聯(lian)(lian)(lian)(lian)支路(lu)數(shu)(shu)(shu)(shu)有關，如電(dian)機(ji)(ji)的并聯(lian)(lian)(lian)(lian)支路(lu)數(shu)(shu)(shu)(shu)為1路(lu)接(jie)(jie)法(fa)，那么該電(dian)機(ji)(ji)各極下線圈所(suo)有串(chuan)(chuan)(chuan)(chuan)聯(lian)(lian)(lian)(lian)線匝(za)(za)數(shu)(shu)(shu)(shu)均應(ying)相(xiang)加(jia)而(er)成(cheng)為相(xiang)繞(rao)(rao)(rao)(rao)(rao)(rao)組(zu)(zu)的總(zong)(zong)線匝(za)(za)數(shu)(shu)(shu)(shu)。如電(dian)機(ji)(ji)的每相(xiang)繞(rao)(rao)(rao)(rao)(rao)(rao)組(zu)(zu)內有多條并聯(lian)(lian)(lian)(lian)支路(lu)數(shu)(shu)(shu)(shu)，即電(dian)機(ji)(ji)為2路(lu)接(jie)(jie)法(fa)、3路(lu)接(jie)(jie)法(fa)等，此時每相(xiang)串(chuan)(chuan)(chuan)(chuan)聯(lian)(lian)(lian)(lian)導體數(shu)(shu)(shu)(shu)則(ze)只(zhi)能(neng)以其中一路(lu)繞(rao)(rao)(rao)(rao)(rao)(rao)組(zu)(zu)所(suo)串(chuan)(chuan)(chuan)(chuan)聯(lian)(lian)(lian)(lian)的線匝(za)(za)數(shu)(shu)(shu)(shu)為準(zhun)。因為相(xiang)繞(rao)(rao)(rao)(rao)(rao)(rao)組(zu)(zu)內各支路(lu)中的串(chuan)(chuan)(chuan)(chuan)聯(lian)(lian)(lian)(lian)線匝(za)(za)數(shu)(shu)(shu)(shu)是相(xiang)同的，并聯(lian)(lian)(lian)(lian)起來(lai)接(jie)(jie)成(cheng)相(xiang)繞(rao)(rao)(rao)(rao)(rao)(rao)組(zu)(zu)后其串(chuan)(chuan)(chuan)(chuan)聯(lian)(lian)(lian)(lian)線匝(za)(za)是不可能(neng)增(zeng)加(jia)。

1、利用(yong)交(jiao)流接觸器實施缺相保護

在電(dian)(dian)動(dong)(dong)(dong)機的(de)主電(dian)(dian)路(lu)當(dang)中(zhong)增(zeng)加同一(yi)(yi)型(xing)號的(de)交流接觸(chu)器(qi)，電(dian)(dian)動(dong)(dong)(dong)機的(de)運(yun)行由兩臺接觸(chu)器(qi)共同控制。當(dang)按下(xia)按鈕(niu)SB2時(shi)(shi)，L3相(xiang)(xiang)電(dian)(dian)源(yuan)經(jing)SB1、SB2、KMI到L2相(xiang)(xiang)，使(shi)(shi)KM1線圈(quan)(quan)得電(dian)(dian)吸合(he)(he)。同時(shi)(shi)KM1的(de)動(dong)(dong)(dong)合(he)(he)輔助(zhu)觸(chu)點(dian)閉合(he)(he)，L3相(xiang)(xiang)電(dian)(dian)源(yuan)經(jing)KM2線圈(quan)(quan)接到L1相(xiang)(xiang)，使(shi)(shi)KM2得電(dian)(dian)吸合(he)(he)，于是電(dian)(dian)動(dong)(dong)(dong)機得電(dian)(dian)運(yun)行。由于在主電(dian)(dian)路(lu)中(zhong)增(zeng)加了同一(yi)(yi)型(xing)號的(de)交流接觸(chu)器(qi)，且兩個接觸(chu)器(qi)的(de)線圈(quan)(quan)電(dian)(dian)壓(ya)(ya)分別來自(zi)L1、L2、L3三相(xiang)(xiang)中(zhong)的(de)電(dian)(dian)壓(ya)(ya)回(hui)路(lu)，所以(yi)任何一(yi)(yi)相(xiang)(xiang)斷(duan)相(xiang)(xiang)，都(dou)能(neng)使(shi)(shi)兩個接觸(chu)器(qi)的(de)一(yi)(yi)個(或(huo)兩個)釋放，東元變頻電(dian)(dian)機維(wei)修中(zhong)心，從而(er)達到缺相(xiang)(xiang)保護作(zuo)用。

三(san)相(xiang)(xiang)電機電流不平(ping)衡可(ke)能會(hui)發生電機的(de)絕(jue)緣擊穿。是(shi)否擊穿看電機繞(rao)組中的(de)電流大(da)小，電機啟(qi)動(dong)時候(hou)啟(qi)動(dong)沖擊電流很(hen)大(da)，此時發生擊穿的(de)可(ke)能性較大(da)，但是(shi)不，這(zhe)跟電流的(de)大(da)小、絕(jue)緣等級等有關。三(san)相(xiang)(xiang)電流不平(ping)衡肯定會(hui)產生電機轉(zhuan)矩的(de)不穩定。

產生電(dian)(dian)機(ji)三(san)相電(dian)(dian)流(liu)不平(ping)衡的原因(yin)，個人認(ren)為主要是由于電(dian)(dian)機(ji)三(san)相繞組不平(ping)衡造成，這當中跟電(dian)(dian)機(ji)的制造工藝有直接的關系(xi)。

其中三(san)相(xiang)(xiang)電(dian)流(liu)不(bu)平衡(情況是(shi)電(dian)機(ji)(ji)缺(que)相(xiang)(xiang))是(shi)主要(yao)故障之一(yi)。三(san)相(xiang)(xiang)電(dian)流(liu)不(bu)平衡可能(neng)(neng)造成起(qi)動困難． 電(dian)機(ji)(ji)運(yun)轉時發出噪(zao)音，嚴重(zhong)時電(dian)機(ji)(ji)會發生劇烈(lie)振動和吼叫．電(dian)流(liu)增大(da)， 如(ru)果不(bu)及時停(ting)機(ji)(ji)，還可能(neng)(neng)引起(qi)電(dian)機(ji)(ji)繞組燒毀。