描述
2.手動(dòng)自動(dòng)混合控制線路
二、自耦變壓器降壓起動(dòng)控制線路
自耦變壓器降壓起動(dòng)是指電動(dòng)機(jī)起動(dòng)時(shí)利用自耦變壓器來降低加在電動(dòng)機(jī)定子繞組上的起動(dòng)電壓。待電動(dòng)機(jī)起動(dòng)后,再將自耦變壓器脫離,使電動(dòng)機(jī)在全壓下正常運(yùn)行。
1.按鈕、接觸器控制自耦變壓器降壓起動(dòng)控制線路
三、星形——三角形降壓起動(dòng)控制線路
星形——三角形(Y—△)降壓起動(dòng)是指電動(dòng)機(jī)起動(dòng)時(shí),把定子繞組接成星形,以降低起動(dòng)電壓,減小起動(dòng)電流;待電動(dòng)機(jī)起動(dòng)后,再把定子繞組改接成三角形,使電動(dòng)機(jī)全壓運(yùn)行。Y—△起動(dòng)只能用于正常運(yùn)行時(shí)為△形接法的電動(dòng)機(jī)。
1.按鈕、接觸器控制Y—△降壓起動(dòng)控制線路
圖2.19(a)為按鈕、接觸器控制Y—△降壓起動(dòng)控制線路。線路的工作原理為:按下起動(dòng)按鈕SB1,KM1、KM2得電吸合,KM1自鎖,電動(dòng)機(jī)星形起動(dòng),待電動(dòng)機(jī)轉(zhuǎn)速接近額定轉(zhuǎn)速時(shí),按下SB2,KM2斷電、KM3得電并自鎖,電動(dòng)機(jī)轉(zhuǎn)換成三角形全壓運(yùn)行。
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