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   電動機與執行(xing)構(gou)件的(de)協調配合

   在電動(dong)機和執行(xing)構件（門(men)(men)體）的運動(dong)參(can)數(shu)(shu)確(que)定后，即(ji)可計算運動(dong)鏈(lian)的總傳動(dong)比。門(men)(men)體的原始(shi)運動(dong)鏈(lian)的總傳動(dong)比和原始(shi)運動(dong)參(can)數(shu)(shu)是下一步進行(xing)傳動(dong)系(xi)統設計、選擇機構時所要具(ju)備的數(shu)(shu)據。

   運(yun)動參(can)數的(de)選擇及電動機的(de)類型

   各種電(dian)動機具(ju)有(you)各自的適(shi)應場合和(he)特性。選擇與機械性能要(yao)求適(shi)應的電(dian)動機的類(lei)型及其參數，是機械設計中的重(zhong)(zhong)要(yao)一節，要(yao)給與十分的重(zhong)(zhong)視。

   由于技術的進(jin)步(bu)(bu)，現在就電(dian)(dian)(dian)(dian)(dian)(dian)動(dong)(dong)機(ji)而言(yan)，除了交(jiao)流異(yi)步(bu)(bu)電(dian)(dian)(dian)(dian)(dian)(dian)動(dong)(dong)機(ji)外，還有力矩電(dian)(dian)(dian)(dian)(dian)(dian)動(dong)(dong)機(ji)、直線電(dian)(dian)(dian)(dian)(dian)(dian)動(dong)(dong)機(ji)、進(jin)步(bu)(bu)電(dian)(dian)(dian)(dian)(dian)(dian)動(dong)(dong)機(ji)、伺服電(dian)(dian)(dian)(dian)(dian)(dian)動(dong)(dong)機(ji)、交(jiao)流變頻變速(su)電(dian)(dian)(dian)(dian)(dian)(dian)動(dong)(dong)機(ji)、多速(su)電(dian)(dian)(dian)(dian)(dian)(dian)動(dong)(dong)機(ji)、帶(dai)減速(su)裝(zhuang)(zhuang)置(zhi)的電(dian)(dian)(dian)(dian)(dian)(dian)動(dong)(dong)機(ji)、帶(dai)變速(su)裝(zhuang)(zhuang)置(zhi)的電(dian)(dian)(dian)(dian)(dian)(dian)動(dong)(dong)機(ji)、直流電(dian)(dian)(dian)(dian)(dian)(dian)動(dong)(dong)機(ji)等。

   電動機的(de)選(xuan)擇是否恰當，對機械(xie)傳動系統的(de)組成、對整個機械(xie)的(de)性能(neng)及其(qi)繁簡程度有(you)直接的(de)影響。如在一般機械(xie)中用(yong)的(de)最多的(de)交流異步(bu)電動機，同步(bu)轉速(su)有(you)750r/min、1000r/min、 1500r/min、3000r/min等(deng)4種，在輸出(chu)同樣(yang)的(de)(de)功率時(shi)，電(dian)動(dong)機(ji)的(de)(de)轉速(su)(su)高、其價格低、尺寸(cun)重量小。但當執(zhi)行構件的(de)(de)速(su)(su)度(du)很低時(shi)，若用高速(su)(su)電(dian)動(dong)機(ji)，勢必需要大減速(su)(su)比的(de)(de)減速(su)(su)裝置，可能會造成(cheng)機(ji)械傳動(dong)系統(tong)的(de)(de)制造成(cheng)本的(de)(de)顯著(zhu)增加和過分龐(pang)大。