22A-B2P3N104

22A-B2P3N104

舵機(jī)主要是由外殼、電路板、無(wú)核心馬達(dá)、齒輪與位置檢測(cè)器所構(gòu)成。 其工作原理是由接收機(jī)發(fā)出訊號(hào)給舵機(jī)，經(jīng)由電路板上的IC判斷轉(zhuǎn)動(dòng)方向，再驅(qū)動(dòng)無(wú)核心馬達(dá)開(kāi)始轉(zhuǎn)動(dòng)，透過(guò)減速齒輪將動(dòng)力傳至擺臂，同時(shí)由位置檢測(cè)器送回訊號(hào)，判斷是否已經(jīng)到達(dá)定位。 位置檢測(cè)器其實(shí)就是可變電阻，當(dāng)舵機(jī)轉(zhuǎn)動(dòng)時(shí)電阻值也會(huì)隨之改變，藉由檢測(cè)電阻值便可知轉(zhuǎn)動(dòng)的角度。

舵機(jī)廠商提供的規(guī)格資料，通常都會(huì)包含外形尺寸（mm）、扭力（kg／cm）、速度（秒／60°）、測(cè)試電壓（V）及重量（g）等基本資料。 扭力的單位是kg／cm，意思是在擺臂長(zhǎng)度1公分處，能吊起幾公斤重的物體。 這就是力臂的觀念，因此擺臂長(zhǎng)度愈長(zhǎng)，則扭力愈小。 速度的單位是sec／60°，意思是舵機(jī)轉(zhuǎn)動(dòng)60°所需要的時(shí)間。

伺服電機(jī)

伺服電機(jī)又稱執(zhí)行電動(dòng)機(jī)，在自動(dòng)控制系統(tǒng)中，用作執(zhí)行元件，把所收到的電信號(hào)轉(zhuǎn)換成電動(dòng)機(jī)軸上的角位移或角速度輸出。 分為直流和交流伺服電動(dòng)機(jī)兩大類，其主要特點(diǎn)是，當(dāng)信號(hào)電壓為零時(shí)無(wú)自轉(zhuǎn)現(xiàn)象，轉(zhuǎn)速隨著轉(zhuǎn)矩的增加而勻速下降。

伺服電機(jī)主要靠脈沖來(lái)定位，基本上可以這樣理解，伺服電機(jī)接收到1個(gè)脈沖，就會(huì)旋轉(zhuǎn)1個(gè)脈沖對(duì)應(yīng)的角度，從而實(shí)現(xiàn)位移，因?yàn)?，伺服電機(jī)本身具備發(fā)出脈沖的功能，所以伺服電機(jī)每旋轉(zhuǎn)一個(gè)角度，都會(huì)發(fā)出對(duì)應(yīng)數(shù)量的脈沖，這樣，和伺服電機(jī)接受的脈沖形成了呼應(yīng)，或者叫閉環(huán)，如此一來(lái)，系統(tǒng)就會(huì)知道發(fā)了多少脈沖給伺服電機(jī)，同時(shí)又收了多少脈沖回來(lái)，這樣， 就能夠很的控制電機(jī)的轉(zhuǎn)動(dòng)，從而實(shí)現(xiàn)的定位，可以達(dá)到0.001mm。

伺服電機(jī)分為交流伺服和直流伺服兩大類。

交流伺服電機(jī)分為異步型交流伺服電動(dòng)機(jī)、同步型交流伺服電動(dòng)機(jī)兩類。

直流伺服電機(jī)分為有刷和無(wú)刷電機(jī)。 有刷電機(jī)成本低，結(jié)構(gòu)簡(jiǎn)單，啟動(dòng)轉(zhuǎn)矩大，調(diào)速范圍寬，控制容易，需要維護(hù)，但維護(hù)不方便（換碳刷），產(chǎn)生電磁干擾，對(duì)環(huán)境有要求。 因此它可以用于對(duì)成本敏感的普通工業(yè)和民用場(chǎng)合。

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