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(du)可(ke)分為限位(wei)型和連續旋轉型。當攝像機需做多方位場景監(jian)視(shi)時,應(ying)配備遙控電動云臺。
二、電動云臺的控制原理
全方(fang)位云臺內部有兩個電(dian)(dian)(dian)(dian)機,分(fen)別負責云臺的(de)(de)上下(xia)和左右(you)各方(fang)向的(de)(de)轉(zhuan)(zhuan)動(dong)(dong)。其工作電(dian)(dian)(dian)(dian)壓的(de)(de)不同也決定了(le)該云臺的(de)(de)整體工作電(dian)(dian)(dian)(dian)壓,一(yi)般有交(jiao)流(liu) 24V、交(jiao)流(liu)220V及直流(liu)12V。當(dang)接到上、下(xia)動(dong)(dong)作電(dian)(dian)(dian)(dian)壓時,垂直電(dian)(dian)(dian)(dian)機轉(zhuan)(zhuan)動(dong)(dong),經減(jian)速箱(xiang)帶動(dong)(dong)垂直傳動(dong)(dong)輪(lun)盤(pan)轉(zhuan)(zhuan)動(dong)(dong);當(dang)接到左、右(you)動(dong)(dong)作電(dian)(dian)(dian)(dian)壓時,水(shui)平電(dian)(dian)(dian)(dian)機轉(zhuan)(zhuan)動(dong)(dong)并(bing)經減(jian)速箱(xiang)帶動(dong)(dong)云臺底部的(de)(de)水(shui)平齒輪(lun)盤(pan)轉(zhuan)(zhuan)動(dong)(dong)。
需要說(shuo)明的(de)是云(yun)臺(tai)(tai)都有水平、垂直(zhi)的(de)限(xian)位(wei)(wei)(wei)(wei)栓(shuan),云(yun)臺(tai)(tai)分別由兩個微動(dong)開關實現限(xian)位(wei)(wei)(wei)(wei)功(gong)能。當(dang)轉動(dong)角度達到預(yu)先設(she)定的(de)限(xian)位(wei)(wei)(wei)(wei)栓(shuan)時,微動(dong)開關動(dong)作切斷電源(yuan),云(yun)臺(tai)(tai)停止轉動(dong)。限(xian)位(wei)(wei)(wei)(wei)裝(zhuang)置可(ke)以位(wei)(wei)(wei)(wei)于云(yun)臺(tai)(tai)外部,調(diao)整過程簡單,也可(ke)以位(wei)(wei)(wei)(wei)于云(yun)臺(tai)(tai)內部,通過外設(she)的(de)調(diao)整機構進行調(diao)整,調(diao)整過程相對(dui)復(fu)雜。但外置限(xian)位(wei)(wei)(wei)(wei)裝(zhuang)置的(de)云(yun)臺(tai)(tai)密(mi)封性不如內置限(xian)位(wei)(wei)(wei)(wei)裝(zhuang)置的(de)云(yun)臺(tai)(tai)。
室外(wai)云(yun)臺(tai)(tai)與室內云(yun)臺(tai)(tai)大體一(yi)致,只是由于室外(wai)防護罩重量(liang)較大,使云(yun)臺(tai)(tai)的(de)載(zai)重能(neng)力必須加(jia)大。同時,室外(wai)環境的(de)冷(leng)熱變(bian)化(hua)大, 易(yi)遭到雨(yu)水或(huo)潮濕的(de)侵蝕。因此室外(wai)云(yun)臺(tai)(tai)一(yi)般(ban)都(dou)設計(ji)成密封防雨(yu)型。另外(wai)室外(wai)云(yun)臺(tai)(tai)還(huan)具有高轉矩(ju)和扼流保護電路以(yi)防止云(yun)臺(tai)(tai)凍結(jie)時強(qiang)行起動而燒毀電機。在低(di)溫的(de)惡(e)劣(lie)條件下還(huan)可以(yi)在云(yun)臺(tai)(tai)內部加(jia)裝(zhuang)溫控型加(jia)熱器(qi)。