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簡述變頻調速技術在電機拖動中的應用

更新時間:2018-03-17      瀏覽次數:1052

    具體來(lai)(lai)講,電(dian)(dian)機(ji)(ji)(ji)拖動(dong)包括諸(zhu)多(duo)方面的(de)(de)內容(rong),比(bi)如直流電(dian)(dian)機(ji)(ji)(ji)、電(dian)(dian)機(ji)(ji)(ji)系統的(de)(de)運動(dong)方程(cheng)以及直流電(dian)(dian)機(ji)(ji)(ji)的(de)(de)靜態(tai)特點、動(dong)態(tai)特點以及變(bian)(bian)壓(ya)器等等。我們從控制類別(bie)方面來(lai)(lai)講,轉速(su)開環是卸油泵電(dian)(dian)動(dong)機(ji)(ji)(ji)的(de)(de)變(bian)(bian)頻(pin)(pin)調(diao)(diao)速(su)系統,電(dian)(dian)源變(bian)(bian)頻(pin)(pin)調(diao)(diao)速(su)系統則是利(li)用恒(heng)壓(ya)頻(pin)(pin)度比(bi)來(lai)(lai)控制的(de)(de)。在(zai)實際的(de)(de)使用過程(cheng)中,要想控制輸出直流電(dian)(dian)壓(ya),主要依(yi)據(ju)的(de)(de)是電(dian)(dian)壓(ya)。

    通過速(su)度(du)給(gei)(gei)定,可(ke)(ke)以(yi)(yi)(yi)(yi)(yi)獲(huo)得(de)整(zheng)(zheng)個電(dian)(dian)(dian)力系(xi)(xi)統(tong)中的(de)(de)(de)(de)(de)(de)控(kong)(kong)制信(xin)號,即使在是(shi)跳躍變(bian)(bian)化的(de)(de)(de)(de)(de)(de)情況下(xia),進(jin)(jin)行(xing)速(su)度(du)給(gei)(gei)定,也可(ke)(ke)以(yi)(yi)(yi)(yi)(yi)對(dui)逆(ni)變(bian)(bian)器(qi)(qi)(qi)的(de)(de)(de)(de)(de)(de)輸(shu)(shu)出電(dian)(dian)(dian)壓以(yi)(yi)(yi)(yi)(yi)及電(dian)(dian)(dian)流(liu)的(de)(de)(de)(de)(de)(de)規律性(xing)(xing)變(bian)(bian)化進(jin)(jin)行(xing)協調和控(kong)(kong)制。因(yin)此(ci),我們將給(gei)(gei)定積分(fen)器(qi)(qi)(qi)給(gei)(gei)設定下(xia)來(lai),用(yong)斜坡輸(shu)(shu)出信(xin)號來(lai)替(ti)代(dai)跳躍輸(shu)(shu)入,這樣就可(ke)(ke)以(yi)(yi)(yi)(yi)(yi)對(dui)電(dian)(dian)(dian)機(ji)(ji)的(de)(de)(de)(de)(de)(de)正(zheng)轉和反(fan)轉進(jin)(jin)行(xing)有(you)(you)(you)(you)效(xiao)(xiao)的(de)(de)(de)(de)(de)(de)控(kong)(kong)制。通過實踐(jian)(jian)得(de)知,在整(zheng)(zheng)個電(dian)(dian)(dian)機(ji)(ji)拖動(dong)(dong)系(xi)(xi)統(tong)運行(xing)過程中,利用(yong)正(zheng)負電(dian)(dian)(dian)壓來(lai)有(you)(you)(you)(you)效(xiao)(xiao)劃分(fen)速(su)度(du)給(gei)(gei)定以(yi)(yi)(yi)(yi)(yi)及給(gei)(gei)定的(de)(de)(de)(de)(de)(de)積分(fen)器(qi)(qi)(qi)輸(shu)(shu)出。因(yin)為正(zheng)值的(de)(de)(de)(de)(de)(de)信(xin)號電(dian)(dian)(dian)壓是(shi)控(kong)(kong)制電(dian)(dian)(dian)流(liu)器(qi)(qi)(qi)的(de)(de)(de)(de)(de)(de)輸(shu)(shu)出電(dian)(dian)(dian)壓和逆(ni)變(bian)(bian)器(qi)(qi)(qi)的(de)(de)(de)(de)(de)(de)輸(shu)(shu)出頻率(lv),那么設置(zhi)的(de)(de)(de)(de)(de)(de)變(bian)(bian)換(huan)器(qi)(qi)(qi)在值方面,沒有(you)(you)(you)(you)較(jiao)大(da)的(de)(de)(de)(de)(de)(de)差異。通過大(da)量的(de)(de)(de)(de)(de)(de)實踐(jian)(jian)研究表(biao)明,變(bian)(bian)頻器(qi)(qi)(qi)系(xi)(xi)統(tong)具有(you)(you)(you)(you)較(jiao)為廣泛(fan)的(de)(de)(de)(de)(de)(de)調速(su)范圍,并且有(you)(you)(you)(you)著較(jiao)好(hao)的(de)(de)(de)(de)(de)(de)調速(su)平滑(hua)性(xing)(xing),可(ke)(ke)以(yi)(yi)(yi)(yi)(yi)對(dui)電(dian)(dian)(dian)機(ji)(ji)啟動(dong)(dong)時性(xing)(xing)能進(jin)(jin)行(xing)有(you)(you)(you)(you)效(xiao)(xiao)的(de)(de)(de)(de)(de)(de)改善,因(yin)此(ci)可(ke)(ke)以(yi)(yi)(yi)(yi)(yi)有(you)(you)(you)(you)效(xiao)(xiao)適用(yong)于電(dian)(dian)(dian)機(ji)(ji)拖動(dong)(dong)中,此(ci)外,也可(ke)(ke)以(yi)(yi)(yi)(yi)(yi)廣泛(fan)應用(yong)于船舶電(dian)(dian)(dian)力拖動(dong)(dong)中。采用(yong)的(de)(de)(de)(de)(de)(de)控(kong)(kong)制信(xin)號是(shi)一樣的(de)(de)(de)(de)(de)(de),只需要協調輸(shu)(shu)出電(dian)(dian)(dian)壓和輸(shu)(shu)出頻率(lv),更(geng)加理(li)性(xing)(xing)的(de)(de)(de)(de)(de)(de)認知變(bian)(bian)頻調速(su)技術,就可(ke)(ke)以(yi)(yi)(yi)(yi)(yi)在電(dian)(dian)(dian)機(ji)(ji)拖動(dong)(dong)中更(geng)好(hao)的(de)(de)(de)(de)(de)(de)應用(yong)變(bian)(bian)頻調速(su)技術。

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