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(dāng)降低后再加到電動機(jī)定子繞組上，目的是為了限制起動電流，等電動機(jī)起動以后，再使電動機(jī)的定子繞組上的電壓恢復(fù)到額定值。由于電動機(jī)轉(zhuǎn)矩與電壓平方成正比，所以降壓起動的起動轉(zhuǎn)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(guān)ＱＳ１，由于定子繞組中串聯(lián)電阻，起減壓作用，所以這時加到電動機(jī)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(jī)的起動，轉(zhuǎn)速逐漸升高。當(dāng)電動機(jī)轉(zhuǎn)速接近額定轉(zhuǎn)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(jī)處于正常運(yùn)轉(zhuǎn)狀態(tài)。 

鄭娟萍

廈門仲鑫航自動化設(shè)備有限公司  

手動控制線路在實(shí)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(shí)現(xiàn)自動控制〔圖７－４，其動作過程為：合上電源開關(guān)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(jī)定子繞組中串有電阻Ｒ，進(jìn)行降壓起動，電動機(jī)的轉(zhuǎn)速逐步升高，當(dāng)時間繼電器ＫＴ達(dá)到預(yù)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(jī)便處在額定電壓下運(yùn)轉(zhuǎn)。通常ＫＴ的延時時間為４－８ｓ。

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