大型注塑機馬達的啟動電路有很多種:有直接啟動電路。也有降壓啟動電路。降壓啟動電路又分好幾種形式。而在注塑機的應用(yong)中(zhong)馬達的降壓啟(qi)(qi)(qi)動(dong)以星形(xing)(xing)/角形(xing)(xing)換(huan)接降壓啟(qi)(qi)(qi)動(dong)最常見(jian)。現在，我們就(jiu)來認識一下這種(zhong)星形(xing)(xing)/角形(xing)(xing)換(huan)接降壓啟(qi)(qi)(qi)動(dong)電(dian)路。這種(zhong)電(dian)路不僅在注塑機上常應用(yong)，而(er)且在其它一些機械上的馬達啟(qi)(qi)(qi)動(dong)中(zhong)也常用(yong)。

   注塑機(ji)的油(you)泵馬(ma)達(da)控(kong)制(zhi)(zhi)電(dian)(dian)(dian)路(lu)(lu)一般根(gen)據馬(ma)達(da)功(gong)率大小不(bu)同采(cai)用(yong)不(bu)同控(kong)制(zhi)(zhi)方式，在功(gong)率不(bu)大于(yu)(yu)7.5Kw時常采(cai)用(yong)直接啟(qi)(qi)動(dong)(dong)電(dian)(dian)(dian)路(lu)(lu)，當油(you)泵馬(ma)達(da)功(gong)率大于(yu)(yu)7.5Kw以上(shang)時，均采(cai)用(yong)星形(xing)(xing)(xing)/角(jiao)形(xing)(xing)(xing)換接降(jiang)(jiang)壓啟(qi)(qi)動(dong)(dong)電(dian)(dian)(dian)路(lu)(lu)。星形(xing)(xing)(xing)/角(jiao)形(xing)(xing)(xing)換接降(jiang)(jiang)壓啟(qi)(qi)動(dong)(dong)電(dian)(dian)(dian)路(lu)(lu)是為了(le)減少(shao)啟(qi)(qi)動(dong)(dong)電(dian)(dian)(dian)流(liu)，采(cai)用(yong)星形(xing)(xing)(xing)降(jiang)(jiang)壓啟(qi)(qi)動(dong)(dong)，三(san)角(jiao)形(xing)(xing)(xing)全壓運行的方式。星形(xing)(xing)(xing)/三(san)角(jiao)形(xing)(xing)(xing)啟(qi)(qi)動(dong)(dong)電(dian)(dian)(dian)路(lu)(lu)主(zhu)要由(you)三(san)極(ji)自(zi)動(dong)(dong)空(kong)氣(qi)開(kai)(kai)關(guan)、熔斷器(qi)、三(san)個交(jiao)流(liu)接觸器(qi)、熱繼(ji)電(dian)(dian)(dian)器(qi)、馬(ma)達(da)組(zu)成。其控(kong)制(zhi)(zhi)電(dian)(dian)(dian)路(lu)(lu)常用(yong)單極(ji)自(zi)動(dong)(dong)空(kong)氣(qi)開(kai)(kai)關(guan)、急停(ting)按(an)鈕(niu),按(an)鈕(niu)、時間繼(ji)電(dian)(dian)(dian)器(qi)等組(zu)成。通常主(zhu)電(dian)(dian)(dian)路(lu)(lu)器(qi)件(jian)和(he)控(kong)制(zhi)(zhi)電(dian)(dian)(dian)路(lu)(lu)中的單極(ji)空(kong)氣(qi)開(kai)(kai)關(guan)、時間繼(ji)電(dian)(dian)(dian)器(qi)在注塑機(ji)的配(pei)電(dian)(dian)(dian)箱或(huo)配(pei)電(dian)(dian)(dian)板(ban)內布置，急停(ting)按(an)鈕(niu)和(he)按(an)鈕(niu)在控(kong)制(zhi)(zhi)屏或(huo)操(cao)作面板(ban)或(huo)控(kong)制(zhi)(zhi)面板(ban)上(shang)布置。

   星形啟動時，由于定子繞組接成星形連接，青島注塑機廠家鑫(xin)科源使(shi)馬(ma)達(da)啟動電(dian)流(liu)降低至全電(dian)壓啟動時的(de)1/3，啟動完(wan)畢后，又將(jiang)定子(zi)繞組換接成三(san)角(jiao)形(xing)連接，使(shi)馬(ma)達(da)以全電(dian)壓正常工作(zuo)。通(tong)過星形(xing)/三(san)角(jiao)形(xing)換接啟動來改善啟動性能，減少啟動電(dian)流(liu)對供電(dian)電(dian)源和(he)供電(dian)網造成的(de)沖擊。

  1:合上(shang)自動(dong)空(kong)氣(qi)開(kai)關QF1，電(dian)路送上(shang)動(dong)力電(dian)源(yuan)和(he)控(kong)制電(dian)源(yuan)，合上(shang)空(kong)氣(qi)開(kai)關QF2。

  2:按下啟動按鈕sB2，主接(jie)(jie)(jie)(jie)(jie)觸器(qi)(qi)KM1吸(xi)合(he)，主電(dian)(dian)路(lu)接(jie)(jie)(jie)(jie)(jie)通(tong)電(dian)(dian)源，電(dian)(dian)動機M接(jie)(jie)(jie)(jie)(jie)線端U1、Ⅴ1、W1通(tong)入三相(xiang)交流電(dian)(dian)。與此同(tong)時，并聯控制(zhi)電(dian)(dian)路(lu)中，通(tong)過自(zi)鎖常(chang)閉(bi)觸點(dian)(dian)KM22和(he)時間(jian)繼電(dian)(dian)器(qi)(qi)常(chang)閉(bi)延時觸點(dian)(dian)KT使(shi)得星形(xing)接(jie)(jie)(jie)(jie)(jie)觸器(qi)(qi)KM1得電(dian)(dian)，其主觸點(dian)(dian)kM3閉(bi)合(he)將馬(ma)達(da)M的另(ling)一組接(jie)(jie)(jie)(jie)(jie)線端U2、Ⅴ2、W2通(tong)過星形(xing)連(lian)線接(jie)(jie)(jie)(jie)(jie)通(tong)，使(shi)得馬(ma)達(da)按星形(xing)接(jie)(jie)(jie)(jie)(jie)法(fa)運轉。

  3:在馬達M星形啟動的同時，時間繼電(dian)(dian)器kT1線圈受電(dian)(dian)，開(kai)始計時，通過其延(yan)時閉合和延(yan)時斷開(kai)觸點來(lai)控(kong)制電(dian)(dian)路(lu)進行轉換。

  4:當計時(shi)(shi)到時(shi)(shi)，其(qi)延時(shi)(shi)常(chang)閉觸點(dian)kT1斷(duan)開(kai)(kai)控制電(dian)路，使得(de)星形接(jie)觸器(qi)KM3線(xian)圈失電(dian)，馬(ma)(ma)達M的星形連接(jie)斷(duan)開(kai)(kai)，同時(shi)(shi)其(qi)延時(shi)(shi)常(chang)開(kai)(kai)觸點(dian)kT2閉合(he)。使得(de)三(san)角(jiao)形接(jie)觸器(qi)KM2線(xian)圈得(de)電(dian)吸合(he)，其(qi)主(zhu)觸點(dian)kM2將馬(ma)(ma)達M的另一但接(jie)線(xian)端U2、Ⅴ2、W2端接(jie)成三(san)角(jiao)形法，使馬(ma)(ma)達M按(an)角(jiao)形運轉，馬(ma)(ma)達啟動過程完(wan)成。

  5:按下停止按鈕sB1，控制電路失電，主交流接觸器KM1和角形接觸器KM3線圈失電，主電路斷開，馬.達M停止轉動。青(qing)島鑫(xin)科源機(ji)電設備(bei)有限公司專(zhuan)業注塑機(ji)廠家友情提示