一、電動云臺是什么
電動云臺是用于安裝攝像機,它在控制電壓(云臺控制器輸出的電壓)的作用下,做水平和垂直轉動,使攝像機能在大范圍內對準并攝取所需要的觀察目標。按旋轉角度可分為限位型和連(lian)續旋轉型。當攝(she)像機需做多方位場景監視時,應配備遙(yao)控電動(dong)云(yun)臺。
二、電動云臺的控制原理
全方(fang)位云(yun)(yun)臺(tai)內部有(you)兩個電(dian)(dian)(dian)機(ji),分別負責云(yun)(yun)臺(tai)的上(shang)下(xia)和左右(you)各方(fang)向(xiang)的轉(zhuan)動(dong)(dong)。其工作(zuo)(zuo)電(dian)(dian)(dian)壓(ya)的不同也決定了該云(yun)(yun)臺(tai)的整(zheng)體工作(zuo)(zuo)電(dian)(dian)(dian)壓(ya),一般有(you)交流 24V、交流220V及直流12V。當(dang)接到上(shang)、下(xia)動(dong)(dong)作(zuo)(zuo)電(dian)(dian)(dian)壓(ya)時,垂直電(dian)(dian)(dian)機(ji)轉(zhuan)動(dong)(dong),經減(jian)速箱帶動(dong)(dong)垂直傳動(dong)(dong)輪盤轉(zhuan)動(dong)(dong);當(dang)接到左、右(you)動(dong)(dong)作(zuo)(zuo)電(dian)(dian)(dian)壓(ya)時,水平電(dian)(dian)(dian)機(ji)轉(zhuan)動(dong)(dong)并經減(jian)速箱帶動(dong)(dong)云(yun)(yun)臺(tai)底部的水平齒輪盤轉(zhuan)動(dong)(dong)。
需要(yao)說明(ming)的(de)(de)是(shi)云(yun)臺(tai)(tai)(tai)(tai)都有水平、垂(chui)直(zhi)的(de)(de)限(xian)(xian)位(wei)(wei)栓,云(yun)臺(tai)(tai)(tai)(tai)分(fen)別(bie)由兩個(ge)微(wei)動(dong)(dong)開關(guan)實現限(xian)(xian)位(wei)(wei)功能。當(dang)轉動(dong)(dong)角度達(da)到預先(xian)設(she)(she)定的(de)(de)限(xian)(xian)位(wei)(wei)栓時,微(wei)動(dong)(dong)開關(guan)動(dong)(dong)作(zuo)切斷(duan)電源(yuan),云(yun)臺(tai)(tai)(tai)(tai)停止轉動(dong)(dong)。限(xian)(xian)位(wei)(wei)裝(zhuang)置(zhi)可以(yi)位(wei)(wei)于(yu)(yu)云(yun)臺(tai)(tai)(tai)(tai)外(wai)部(bu)(bu),調整過程(cheng)簡單(dan),也(ye)可以(yi)位(wei)(wei)于(yu)(yu)云(yun)臺(tai)(tai)(tai)(tai)內(nei)部(bu)(bu),通過外(wai)設(she)(she)的(de)(de)調整機(ji)構進行調整,調整過程(cheng)相對復雜。但外(wai)置(zhi)限(xian)(xian)位(wei)(wei)裝(zhuang)置(zhi)的(de)(de)云(yun)臺(tai)(tai)(tai)(tai)密(mi)封性不如內(nei)置(zhi)限(xian)(xian)位(wei)(wei)裝(zhuang)置(zhi)的(de)(de)云(yun)臺(tai)(tai)(tai)(tai)。
室(shi)外(wai)云(yun)(yun)臺(tai)與(yu)室(shi)內云(yun)(yun)臺(tai)大(da)(da)(da)體一致,只是(shi)由于室(shi)外(wai)防(fang)護罩重量較大(da)(da)(da),使(shi)云(yun)(yun)臺(tai)的(de)載重能力必須加(jia)(jia)大(da)(da)(da)。同時(shi),室(shi)外(wai)環境的(de)冷熱變化大(da)(da)(da), 易遭到雨水或(huo)潮濕的(de)侵(qin)蝕。因此室(shi)外(wai)云(yun)(yun)臺(tai)一般都設計(ji)成密(mi)封(feng)防(fang)雨型。另外(wai)室(shi)外(wai)云(yun)(yun)臺(tai)還具有高(gao)轉矩和扼流保護電(dian)路以防(fang)止(zhi)云(yun)(yun)臺(tai)凍結時(shi)強(qiang)行起動而(er)燒毀電(dian)機。在(zai)低溫的(de)惡劣(lie)條件(jian)下(xia)還可(ke)以在(zai)云(yun)(yun)臺(tai)內部(bu)加(jia)(jia)裝溫控型加(jia)(jia)熱器(qi)。