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大功率穿心電容和運行電容的作用及區別？

來源：jincuigu.com.cn 發布時間：2021-01-07 返回
  然而有的單相電機有一個大功率穿心電容，有的電機它有兩個大功率穿心電容，這是為什么呢？因為有的電機它配置了一個啟動電容和一個運行電容，怎么回事呢？
  大功率穿心電容
  運行電容(rong)：它是把交流電移相后接入副繞組(zu)形(xing)成一(yi)(yi)個(ge)交變磁(ci)場，并與主繞組(zu)的(de)交變磁(ci)場形(xing)成一(yi)(yi)個(ge)近似圓(yuan)形(xing)的(de)橢圓(yuan)形(xing)旋轉磁(ci)場。所以他可以是同一(yi)(yi)個(ge)電容(rong)，但(dan)它的(de)作用是不同的(de)。
  
  無(wu)論是(shi)(shi)哪種電(dian)(dian)(dian)容(rong)(rong)，在電(dian)(dian)(dian)機(ji)起動(dong)(dong)(dong)(dong)之初(chu)都具有(you)起動(dong)(dong)(dong)(dong)作用(yong)。但當電(dian)(dian)(dian)機(ji)達到額(e)定轉速的(de)75[%]左右(you)時(shi)，起動(dong)(dong)(dong)(dong)電(dian)(dian)(dian)容(rong)(rong)才由(you)離心開關自動(dong)(dong)(dong)(dong)斷開，而運行電(dian)(dian)(dian)容(rong)(rong)則陪電(dian)(dian)(dian)機(ji)繼續工作。 電(dian)(dian)(dian)機(ji)起動(dong)(dong)(dong)(dong)的(de)過程(cheng)，其實就(jiu)是(shi)(shi)“列(lie)相”的(de)過程(cheng)。因為單相電(dian)(dian)(dian)機(ji)與三相電(dian)(dian)(dian)機(ji)不(bu)一樣，沒有(you)相位(wei)差，產生不(bu)了旋轉磁場。電(dian)(dian)(dian)容(rong)(rong)的(de)作用(yong)，就(jiu)是(shi)(shi)使電(dian)(dian)(dian)機(ji)的(de)起動(dong)(dong)(dong)(dong)繞組電(dian)(dian)(dian)流(liu)在時(shi)間(jian)和 空間(jian)上(shang)，超前于(yu)運行繞組90個電(dian)(dian)(dian)工角度，形成(cheng)相位(wei)差。
  
  馬(ma)達啟(qi)動大功(gong)率穿心電(dian)(dian)(dian)容(rong)是讓單(dan)項電(dian)(dian)(dian)機的(de)啟(qi)動線圈在啟(qi)動時(shi)通電(dian)(dian)(dian)，啟(qi)動后(hou)切斷，運行電(dian)(dian)(dian)容(rong)是讓電(dian)(dian)(dian)機在運行中起到電(dian)(dian)(dian)容(rong)補償，所以啟(qi)動電(dian)(dian)(dian)容(rong)不能少，而(er)運行電(dian)(dian)(dian)容(rong)可以不用。
  
  運(yun)行(xing)電(dian)容(rong)是(shi)壓(ya)機(ji)(ji)正常工作(zuo)的(de)時候用(yong)的(de)啟(qi)動(dong)電(dian)容(rong)是(shi)壓(ya)機(ji)(ji)啟(qi)動(dong)時和運(yun)行(xing)電(dian)容(rong)一(yi)塊把壓(ya)機(ji)(ji)啟(qi)動(dong)起(qi)來(lai)。壓(ya)機(ji)(ji)轉起(qi)來(lai)以后啟(qi)動(dong)電(dian)容(rong)就斷開了。運(yun)行(xing)和啟(qi)動(dong)電(dian)容(rong)并在一(yi)起(qi)不過啟(qi)動(dong)電(dian)容(rong)有一(yi)個開過，電(dian)機(ji)(ji)轉起(qi)來(lai)啟(qi)動(dong)電(dian)容(rong)就沒用(yong)了。
  
  馬達啟(qi)動(dong)大(da)功(gong)率(lv)穿心(xin)電(dian)(dian)容(rong)(rong)和運(yun)(yun)行電(dian)(dian)容(rong)(rong)的(de)區別體(ti)現(xian)在哪里呢？就是啟(qi)動(dong)電(dian)(dian)容(rong)(rong)容(rong)(rong)量大(da)，一般是運(yun)(yun)行電(dian)(dian)容(rong)(rong)的(de)2-5倍，而運(yun)(yun)行電(dian)(dian)容(rong)(rong)的(de)容(rong)(rong)量小，兩(liang)者容(rong)(rong)量差別巨(ju)大(da)，容(rong)(rong)易區別

電容器知(zhi)識

穿心電容