電(dian)動(dong)(dong)機通過傳動(dong)(dong)裝置(zhi)向天窗(chuang)的(de)開(kai)閉(bi)(bi)提(ti)供動(dong)(dong)力，能雙向轉動(dong)(dong)，即(ji)通過改(gai)變電(dian)流的(de)方向以改(gai)變電(dian)動(dong)(dong)機的(de)旋轉方向，實(shi)現天窗(chuang)的(de)開(kai)閉(bi)(bi)。

  傳動(dong)(dong)(dong)(dong)(dong)(dong)機(ji)構(gou)主要由蝸(gua)輪(lun)(lun)(lun)蝸(gua)桿傳動(dong)(dong)(dong)(dong)(dong)(dong)機(ji)構(gou)、中間(jian)齒(chi)(chi)輪(lun)(lun)(lun)傳動(dong)(dong)(dong)(dong)(dong)(dong)機(ji)構(gou)（主動(dong)(dong)(dong)(dong)(dong)(dong)中間(jian)齒(chi)(chi)輪(lun)(lun)(lun)、過(guo)渡(du)中間(jian)齒(chi)(chi)輪(lun)(lun)(lun)）和驅動(dong)(dong)(dong)(dong)(dong)(dong)齒(chi)(chi)輪(lun)(lun)(lun)等(deng)組(zu)成。齒(chi)(chi)輪(lun)(lun)(lun)傳動(dong)(dong)(dong)(dong)(dong)(dong)機(ji)構(gou)接受(shou)電機(ji)的動(dong)(dong)(dong)(dong)(dong)(dong)力，改變旋轉方向(xiang)，并(bing)將動(dong)(dong)(dong)(dong)(dong)(dong)力傳給(gei)滑動(dong)(dong)(dong)(dong)(dong)(dong)螺桿，使天窗實現開(kai)閉(bi)(bi)；同(tong)時又將動(dong)(dong)(dong)(dong)(dong)(dong)力傳給(gei)凸輪(lun)(lun)(lun)，使凸輪(lun)(lun)(lun)觸動(dong)(dong)(dong)(dong)(dong)(dong)限位開(kai)關進行開(kai)閉(bi)(bi)。主動(dong)(dong)(dong)(dong)(dong)(dong)中間(jian)齒(chi)(chi)輪(lun)(lun)(lun)與蝸(gua)輪(lun)(lun)(lun)固定(ding)在同(tong)一(yi)軸上(shang)，并(bing)與蝸(gua)輪(lun)(lun)(lun)同(tong)步轉動(dong)(dong)(dong)(dong)(dong)(dong)；過(guo)渡(du)中間(jian)齒(chi)(chi)輪(lun)(lun)(lun)與驅動(dong)(dong)(dong)(dong)(dong)(dong)齒(chi)(chi)輪(lun)(lun)(lun)固定(ding)在同(tong)一(yi)輸出軸上(shang)，被主動(dong)(dong)(dong)(dong)(dong)(dong)中間(jian)齒(chi)(chi)輪(lun)(lun)(lun)驅動(dong)(dong)(dong)(dong)(dong)(dong)，使驅動(dong)(dong)(dong)(dong)(dong)(dong)齒(chi)(chi)輪(lun)(lun)(lun)帶動(dong)(dong)(dong)(dong)(dong)(dong)玻璃開(kai)閉(bi)(bi)。　

  電動(dong)(dong)天(tian)窗(chuang)的開(kai)(kai)關(guan)(guan)(guan)(guan)由控制(zhi)開(kai)(kai)關(guan)(guan)(guan)(guan)和限(xian)位(wei)開(kai)(kai)關(guan)(guan)(guan)(guan)組成。控制(zhi)開(kai)(kai)關(guan)(guan)(guan)(guan)主要包括滑動(dong)(dong)開(kai)(kai)關(guan)(guan)(guan)(guan)和斜(xie)升開(kai)(kai)關(guan)(guan)(guan)(guan)。滑動(dong)(dong)開(kai)(kai)關(guan)(guan)(guan)(guan)有(you)滑動(dong)(dong)打開(kai)(kai)、滑動(dong)(dong)關(guan)(guan)(guan)(guan)閉和斷開(kai)(kai)（中間(jian)位(wei)置）3個(ge)擋位(wei)。斜(xie)升開(kai)(kai)關(guan)(guan)(guan)(guan)也是有(you)斜(xie)升、斜(xie)降和斷開(kai)(kai)（中間(jian)位(wei)置）3個(ge)擋位(wei)。通過操作這(zhe)些開(kai)(kai)關(guan)(guan)(guan)(guan)，令(ling)天(tian)窗(chuang)驅動(dong)(dong)機構的電動(dong)(dong)機實(shi)現正反轉，在不同(tong)狀(zhuang)態下正常工(gong)作。　

  限(xian)位開關主(zhu)要(yao)是用來檢(jian)測天(tian)(tian)窗所處的位置(zhi)。限(xian)位開關靠凸(tu)輪(lun)轉(zhuan)動(dong)(dong)(dong)(dong)來實(shi)(shi)現斷(duan)開和(he)閉合(he)。凸(tu)輪(lun)安裝在驅(qu)動(dong)(dong)(dong)(dong)機構(gou)的動(dong)(dong)(dong)(dong)力輸(shu)出(chu)端。當電動(dong)(dong)(dong)(dong)機將動(dong)(dong)(dong)(dong)力輸(shu)出(chu)時，通(tong)過驅(qu)動(dong)(dong)(dong)(dong)齒(chi)輪(lun)和(he)滑(hua)動(dong)(dong)(dong)(dong)螺桿減速以后帶動(dong)(dong)(dong)(dong)凸(tu)輪(lun)轉(zhuan)動(dong)(dong)(dong)(dong)，于是凸(tu)輪(lun)周(zhou)邊的凸(tu)起部位觸動(dong)(dong)(dong)(dong)開關使其開閉，以實(shi)(shi)現對(dui)天(tian)(tian)窗的自動(dong)(dong)(dong)(dong)控制。