電機軸配件   

 一般來說, 防(fang)止低頻軸電流產生(sheng)的(de)常規措施(shi)有如(ru)下幾種: (1) 增(zeng)加(jia)接地碳刷, 使轉(zhuan)軸接地; (2) 使用絕緣軸承; (3) 使用對稱電纜(lan); (4) 增(zeng)加(jia)補償變壓(ya)器(qi); (5) 增(zeng)加(jia)絕緣板。 高頻軸電流的(de)預防措施(shi)

　　(1) 選擇正確的電纜

　　必(bi)須選用對稱的多芯電(dian)纜，電(dian)纜的接(jie)(jie)地(di)(di)線(xian)(PE，保護接(jie)(jie)地(di)(di))必(bi)須對稱排(pai)列; 電(dian)纜的屏蔽(bi)(bi)層(ceng)選用銅編(bian)制(zhi)帶，因為銅的導電(dian)性能優越，屏蔽(bi)(bi)效果比較好; 屏蔽(bi)(bi)層(ceng)的總截(jie)面積應(ying)不小于相線(xian)的1/2;

　　電(dian)纜頭兩(liang)端做360°的接頭，并分別與(yu)變頻柜和電(dian)機內接地端連接。

　　(2) 安裝高頻濾波器

　　只要變頻(pin)(pin)(pin)器(qi)處的(de)高(gao)頻(pin)(pin)(pin)諧波(bo)存(cun)在(zai)，就會產生共模電流(liu)，所(suo)以如果(guo)能夠對高(gao)頻(pin)(pin)(pin)電流(liu)進行衰減，則可以在(zai)源頭上抑制軸電流(liu)。在(zai)變頻(pin)(pin)(pin)器(qi)的(de)輸出線上安(an)裝共模濾(lv)波(bo)器(qi)，具(ju)體(ti)措施為:在(zai)三相(xiang)對稱電纜的(de)外面(mian)套(tao)上濾(lv)波(bo)器(qi)磁環，使高(gao)頻(pin)(pin)(pin)電流(liu)在(zai)磁環中被(bei)吸收(shou)。由于(yu)高(gao)頻(pin)(pin)(pin)電流(liu)會產生高(gao)頻(pin)(pin)(pin)磁場，所(suo)以濾(lv)波(bo)器(qi)可以做成非接觸式(shi)。

　　開關電(dian)(dian)源(yuan)濾(lv)波(bo)器中(zhong)的電(dian)(dian)容一般要求(qiu)電(dian)(dian)感值比(bi)較小，這樣諧振頻率(lv)高(gao)(gao)，抑制高(gao)(gao)頻電(dian)(dian)流(liu)的效果好。某(mou)線材廠主電(dian)(dian)機(ji)的變(bian)頻柜(ju)內已經(jing)安裝了(le)共模濾(lv)波(bo)器，與安裝前相(xiang)比(bi)，在電(dian)(dian)機(ji)側(ce)的高(gao)(gao)頻電(dian)(dian)流(liu)值明顯有所下降。 (3) 均(jun)衡接地(di)電(dian)(dian)壓

　　由于存在(zai)(zai)雜散電(dian)(dian)(dian)(dian)(dian)容，在(zai)(zai)同一(yi)根電(dian)(dian)(dian)(dian)(dian)纜(lan)的(de)屏(ping)蔽層(都已接(jie)(jie)(jie)(jie)地(di))上(shang)兩端(逆(ni)變(bian)器側與(yu)電(dian)(dian)(dian)(dian)(dian)機(ji)側)的(de)地(di)電(dian)(dian)(dian)(dian)(dian)壓(ya)實際上(shang)并非完全一(yi)致，這樣(yang)在(zai)(zai)電(dian)(dian)(dian)(dian)(dian)纜(lan)上(shang)存在(zai)(zai)壓(ya)降(jiang)(jiang)，就會存在(zai)(zai)電(dian)(dian)(dian)(dian)(dian)流(liu)。所以(yi)，可(ke)以(yi)考慮均(jun)衡接(jie)(jie)(jie)(jie)地(di)電(dian)(dian)(dian)(dian)(dian)壓(ya)，降(jiang)(jiang)低(di)電(dian)(dian)(dian)(dian)(dian)纜(lan)屏(ping)蔽層上(shang)的(de)壓(ya)降(jiang)(jiang)，從而(er)降(jiang)(jiang)低(di)軸電(dian)(dian)(dian)(dian)(dian)流(liu)。具(ju)體做法是在(zai)(zai)現場(chang)安裝(zhuang)一(yi)個共用接(jie)(jie)(jie)(jie)地(di)母(mu)排，然后將各電(dian)(dian)(dian)(dian)(dian)機(ji)接(jie)(jie)(jie)(jie)地(di)端子與(yu)之相連(lian)接(jie)(jie)(jie)(jie)。由于變(bian)頻柜內的(de)接(jie)(jie)(jie)(jie)地(di)線是引自系統總的(de)接(jie)(jie)(jie)(jie)地(di)裝(zhuang)置，從而(er)將電(dian)(dian)(dian)(dian)(dian)機(ji)與(yu)逆(ni)變(bian)器的(de)接(jie)(jie)(jie)(jie)地(di)電(dian)(dian)(dian)(dian)(dian)壓(ya)均(jun)衡，降(jiang)(jiang)低(di)電(dian)(dian)(dian)(dian)(dian)壓(ya)降(jiang)(jiang)。另外，可(ke)以(yi)考慮降(jiang)(jiang)低(di)電(dian)(dian)(dian)(dian)(dian)機(ji)電(dian)(dian)(dian)(dian)(dian)纜(lan)屏(ping)蔽線的(de)接(jie)(jie)(jie)(jie)地(di)電(dian)(dian)(dian)(dian)(dian)阻，使該電(dian)(dian)(dian)(dian)(dian)纜(lan)上(shang)部分(fen)電(dian)(dian)(dian)(dian)(dian)流(liu)在(zai)(zai)通過電(dian)(dian)(dian)(dian)(dian)機(ji)軸承之前直接(jie)(jie)(jie)(jie)接(jie)(jie)(jie)(jie)地(di)，分(fen)流(liu)流(liu)經軸承的(de)電(dian)(dian)(dian)(dian)(dian)流(liu)。

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