新聞:萬(wàn)榮縣機(jī)械手用步進(jìn)馬達(dá)17PM-F442B產(chǎn)品
兩種伺服電機(jī)的區(qū)別
說(shuō)到兩種伺服電機(jī)種類，在要求調(diào)速性能較高的場(chǎng)合，一直占據(jù)主導(dǎo)地位的是應(yīng)用直流電動(dòng)機(jī)的調(diào)速系統(tǒng)。但直流電動(dòng)機(jī)都存在一些固有的缺點(diǎn)，如電刷和換向器易磨損，需經(jīng)常維護(hù)。換向器換向時(shí)會(huì)產(chǎn)生火花，使電動(dòng)機(jī)的速度受到限制，也使應(yīng)用環(huán)境受到限制，而且直流電動(dòng)機(jī)結(jié)構(gòu)復(fù)雜，制造困難，所用鋼鐵材料消耗大，制造成本高。而另外一種，交流伺服電機(jī)，特別是鼠籠式感應(yīng)電動(dòng)機(jī)沒(méi)有上述缺點(diǎn)，且轉(zhuǎn)子慣量較直流電機(jī)小，使得動(dòng)態(tài)響應(yīng)更好。在同樣體積下，交流電動(dòng)機(jī)輸出功率可比直流電動(dòng)機(jī)提高10﹪～70﹪，此外，交流電動(dòng)機(jī)的容量可比直流電動(dòng)機(jī)造得大，達(dá)到更高的電壓和轉(zhuǎn)速�，F(xiàn)代數(shù)控機(jī)床都傾向采用交流伺服驅(qū)動(dòng)，交流伺服驅(qū)動(dòng)已有取代直流伺服驅(qū)動(dòng)之勢(shì)。
不少人都認(rèn)為電動(dòng)閥貴，使用成本高，據(jù)知，其實(shí)不然，如果以整體計(jì)算，傳統(tǒng)閥要加上許多配件及管路安裝，價(jià)格并未占優(yōu)勢(shì)，反而要承擔(dān)較多的保養(yǎng)費(fèi)用。就電動(dòng)閥而言，因電動(dòng)閥具備裝配容易、故障率低以及符合業(yè)界自動(dòng)化需求的優(yōu)點(diǎn)，是業(yè)者較劃算的選擇。因?yàn)槭褂靡话銈鹘y(tǒng)氣動(dòng)閥，免不了要有配管、電磁閥及壓縮機(jī)等才能匹配，而電動(dòng)閥是以馬達(dá)驅(qū)動(dòng)，安裝簡(jiǎn)易省事，且電動(dòng)閥安裝配合工廠原有的自控線路即可，可節(jié)省其他成本支出。此外，以馬達(dá)驅(qū)動(dòng)方式開(kāi)閉較平順，無(wú)瞬間沖力過(guò)大的缺點(diǎn)，故障率可大幅降低。
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2.伺服電動(dòng)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。
直流伺服電機(jī)
直流伺服電機(jī)，它包括定子、轉(zhuǎn)子鐵芯、電機(jī)轉(zhuǎn)軸、伺服電機(jī)繞組換向器、伺服電機(jī)繞組、測(cè)速電機(jī)繞組、測(cè)速電機(jī)換向器,所述的轉(zhuǎn)子鐵芯由矽鋼沖片疊壓固定在電機(jī)轉(zhuǎn)軸上構(gòu)成。
新聞:萬(wàn)榮縣機(jī)械手用步進(jìn)馬達(dá)17PM-F442B產(chǎn)品
三是水平狀態(tài)。一般高精度的電子天平都帶有水平調(diào)整裝置和水準(zhǔn)器，使用中，要經(jīng)常對(duì)天平的水平狀態(tài)進(jìn)行檢查。實(shí)際上，有些使用者常忽視了對(duì)天平的水平狀態(tài)的檢查(電子天平因移動(dòng)或其它原因，常造成四角不平或不水平等)這也是造成天平數(shù)據(jù)不準(zhǔn)的主要原因。四是隨時(shí)校準(zhǔn)。有人認(rèn)為，電子天平在經(jīng)過(guò)周期檢定后，在有效期內(nèi)就是準(zhǔn)確的，而往往忽視了校準(zhǔn)的重要性，甚至于不進(jìn)行校準(zhǔn)。殊不知，電子天平在使用中因環(huán)境條件變化、人為等因素，計(jì)量性能時(shí)常會(huì)發(fā)生細(xì)微用前進(jìn)行校準(zhǔn)，必要時(shí)可增加校準(zhǔn)的頻次。新聞:萬(wàn)榮縣機(jī)械手用步進(jìn)馬達(dá)17PM-F442B產(chǎn)品
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新聞:萬(wàn)榮縣機(jī)械手用步進(jìn)馬達(dá)17PM-F442B產(chǎn)品
直流電機(jī)試驗(yàn)項(xiàng)目?jī)?nèi)容？
一、測(cè)量勵(lì)磁繞組和電樞的絕緣電阻；
二、測(cè)量勵(lì)磁繞組的直流電阻；
三、測(cè)量電樞整流片間的直流電阻；
四、勵(lì)磁繞組和電樞的交流耐壓試驗(yàn)；
五、測(cè)量勵(lì)磁可變電阻器的直流電阻；
六、測(cè)量勵(lì)磁回路連同所有連接設(shè)備的絕緣電阻；
七、勵(lì)磁回路連同所有連接設(shè)備的交流耐壓試驗(yàn)；
八、檢查電機(jī)繞組的極性及其連接的正確性；
九、調(diào)整電機(jī)炭刷的中性位置；
十、測(cè)錄直流發(fā)電機(jī)的空載特性和以轉(zhuǎn)子繞組為負(fù)載的勵(lì)磁機(jī)負(fù)載特性曲線。
注：6000kW以上同步發(fā)電機(jī)及調(diào)相機(jī)的勵(lì)磁機(jī)，應(yīng)按本條全部項(xiàng)目進(jìn)行試驗(yàn)。其余直流電機(jī)按本條、二、五、六、八、九、十款進(jìn)行。
