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防爆變頻電動機
隔爆型電(dian)(dian)機(ji)采用隔爆外(wai)殼把可能產生火花(hua)、電(dian)(dian)弧(hu)和危險溫(wen)度的(de)(de)電(dian)(dian)氣(qi)(qi)(qi)部分(fen)與(yu)周圍的(de)(de)爆炸(zha)性(xing)氣(qi)(qi)(qi)體(ti)混(hun)合物隔開。但是(shi),這種外(wai)殼并非是(shi)密封的(de)(de),周圍的(de)(de)爆炸(zha)性(xing)氣(qi)(qi)(qi)體(ti)混(hun)合物可以通(tong)過(guo)外(wai)殼的(de)(de)各部分(fen)接(jie)合面間隙進(jin)入電(dian)(dian)機(ji)內部。當(dang)與(yu)外(wai)殼內的(de)(de)火花(hua)、電(dian)(dian)弧(hu)、危險高溫(wen)等引燃源接(jie)觸時(shi)就(jiu)可能發(fa)生爆炸(zha),這時(shi)電(dian)(dian)機(ji)的(de)(de)隔爆外(wai)殼不僅不會損壞(huai)或變形,而(er)且爆炸(zha)火焰或熾熱(re)氣(qi)(qi)(qi)體(ti)通(tong)過(guo)接(jie)合面間隙傳出時(shi),也不能引燃周圍的(de)(de)爆炸(zha)性(xing)氣(qi)(qi)(qi)體(ti)混(hun)合物。
電(dian)(dian)機(ji)(ji)變(bian)頻(pin)系(xi)(xi)(xi)統(tong)(tong)(tong)大(da)都是采(cai)用的(de)(de)(de)(de)(de)恒V/F 控(kong)(kong)制系(xi)(xi)(xi)統(tong)(tong)(tong),這個(ge)變(bian)頻(pin)控(kong)(kong)制系(xi)(xi)(xi)統(tong)(tong)(tong)的(de)(de)(de)(de)(de)特(te)點是結構簡單、制作便宜。這個(ge)系(xi)(xi)(xi)統(tong)(tong)(tong)被廣(guang)泛應用在風機(ji)(ji)等(deng)大(da)型的(de)(de)(de)(de)(de)并(bing)且對(dui)于變(bian)頻(pin)系(xi)(xi)(xi)統(tong)(tong)(tong)的(de)(de)(de)(de)(de)動(dong)態性能(neng)要求(qiu)(qiu)不是很(hen)高的(de)(de)(de)(de)(de)地方(fang)。這個(ge)系(xi)(xi)(xi)統(tong)(tong)(tong)是一(yi)種典(dian)型的(de)(de)(de)(de)(de)開環控(kong)(kong)制系(xi)(xi)(xi)統(tong)(tong)(tong),這個(ge)系(xi)(xi)(xi)統(tong)(tong)(tong)能(neng)夠滿足大(da)多數電(dian)(dian)機(ji)(ji)的(de)(de)(de)(de)(de)平滑的(de)(de)(de)(de)(de)變(bian)速要求(qiu)(qiu),但(dan)是對(dui)于動(dong)態和靜(jing)態的(de)(de)(de)(de)(de)調(diao)節性能(neng)都是有限的(de)(de)(de)(de)(de),不能(neng)應用在對(dui)動(dong)態和靜(jing)態性能(neng)要求(qiu)(qiu)比較(jiao)嚴格的(de)(de)(de)(de)(de)地方(fang)。為了實現(xian)動(dong)態和靜(jing)態調(diao)節的(de)(de)(de)(de)(de)高性能(neng),我(wo)們只能(neng)采(cai)用閉環控(kong)(kong)制系(xi)(xi)(xi)統(tong)(tong)(tong)來實現(xian)。
防爆變頻電動機
防(fang)(fang)爆(bao)(bao)(bao)電動(dong)機(ji)是具(ju)有(you)(you)防(fang)(fang)爆(bao)(bao)(bao)性(xing)(xing)(xing)能的一類電動(dong)機(ji)。采(cai)取的措(cuo)施(shi)有(you)(you):把電氣設(she)備罩(zhao)裝(zhuang)在一個外(wai)殼(ke)內,這種外(wai)殼(ke)具(ju)有(you)(you)能承受內部(bu)爆(bao)(bao)(bao)炸(zha)(zha)性(xing)(xing)(xing)混(hun)合物的爆(bao)(bao)(bao)炸(zha)(zha)壓力,并能阻止(zhi)內部(bu)的爆(bao)(bao)(bao)炸(zha)(zha)向外(wai)殼(ke)周圍(wei)爆(bao)(bao)(bao)炸(zha)(zha)性(xing)(xing)(xing)混(hun)合物傳播的結(jie)構(隔爆(bao)(bao)(bao)型);使電動(dong)機(ji)帶(dai)電零部(bu)件不可能產生足以引起爆(bao)(bao)(bao)炸(zha)(zha)危(wei)(wei)險(xian)的火花、電弧或危(wei)(wei)險(xian)溫度(du),或把可能產生這些現象的帶(dai)電零部(bu)件與爆(bao)(bao)(bao)炸(zha)(zha)性(xing)(xing)(xing)混(hun)合物隔斷(duan)開,使之不能相互接觸(chu)或達不到具(ju)有(you)(you)爆(bao)(bao)(bao)炸(zha)(zha)性(xing)(xing)(xing)危(wei)(wei)險(xian)的程度(du)(增安(an)型、通風(feng)型等)。在各類有(you)(you)爆(bao)(bao)(bao)炸(zha)(zha)性(xing)(xing)(xing)危(wei)(wei)險(xian)的環境中,正確地選用與各類設(she)備配套的防(fang)(fang)爆(bao)(bao)(bao)電動(dong)機(ji)是非常重要(yao)的。
其主要特點是:
⑴功率(lv)等級、安(an)裝(zhuang)尺寸及轉速的(de)對應關系與DIN42673一致,同時考慮到與YB系列(lie)
的(de)繼承性和Y2系列的(de)互換性,作了必要調整,更加有效和適(shi)用。
⑵全系列采(cai)用F級絕緣(yuan),溫升(sheng)按B級考(kao)核。
⑶噪聲限值比YB系(xi)(xi)列(lie)低,接近YB系(xi)(xi)列(lie)的I級噪聲,振動限值與(yu)YB系(xi)(xi)列(lie)相當。
⑷外(wai)殼防(fang)護等級提(ti)高到IP55。
⑸全(quan)系(xi)列選用(yong)低(di)噪聲(sheng)深溝球軸(zhou)承,機座中心高在180mm以上電機設注(zhu)排油裝置。
⑹電機(ji)散熱片有平(ping)(ping)行(xing)水平(ping)(ping)分布(bu)(bu)和(he)輻射分布(bu)(bu)兩(liang)種(zhong),以平(ping)(ping)行(xing)水平(ping)(ping)分布(bu)(bu)為主。
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