F7130A電源F7130A電源
降壓起動控制線路:所謂降壓起動就是使電壓適當降低后再加到電動機定子繞組上,目的是為了限制起動電流,等電動機起動以后,再使電動機的定子繞組上的電壓恢復到額定值。由于電動機轉矩與電壓平方成正比,所以降壓起動的起動轉矩大為降低,因此,減壓起動方法僅適用于空載或輕載下起動的場合。減壓起動一般有下列幾種方法。
(1)定子繞組串電阻(或電抗器)的降壓起動控制線路 起動時,可以手動也可自動,其線路如圖7-4,為手動控制線路。合上電源開關QS1,由于定子繞組中串聯電阻,起減壓作用,所以這時加到電動機定子繞組上的電壓低于額定電壓,這樣就限制了起動電流。隨著電動機的起動,轉速逐漸升高。當電動機轉速接近額定轉速時,立即合上QS2,將電阻R短接,定子繞組上的電壓便上升到額定工作電壓,電動機處于正常運轉狀態。
手機
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Qq:
鄭娟萍
廈門仲鑫航自動化設備有限公司
手動控制線路在實際使用過程中,既不方便也不可靠。故一般均采用接觸器、時間繼電器來實現自動控制〔圖7-4,其動作過程為:合上電源開關QS1,按下起動按鈕SB1,接觸器KM1與時間繼電器KT的線圈同時通電KM1主觸頭閉合,由于KM2線圈的回路中,串有時間繼電器KT延時閉合的動合觸頭而不能吸合,這時電動機定子繞組中串有電阻R,進行降壓起動,電動機的轉速逐步升高,當時間繼電器KT達到預先整定的時間后,其延時閉合的動合觸頭閉合,KM2吸合,主觸頭閉合,將起動電阻R短接,電動機便處在額定電壓下運轉。通常KT的延時時間為4-8s。
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