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JP 83023463 3A99266G01同步電動(dòng)機(jī)廣泛應(yīng)用在工農(nóng)業(yè)生產(chǎn)恒速系統(tǒng)中，具有自由調(diào)節(jié)功率因數(shù)、轉(zhuǎn)速恒定、負(fù)載特性硬等優(yōu)點(diǎn)。但是，長(zhǎng)期以來(lái)，同步電動(dòng)機(jī)啟動(dòng)困難是限制它廣泛應(yīng)用的一個(gè)重要原因。全壓異步直接啟動(dòng)方式因其操作*簡(jiǎn)單、方便，而在工程實(shí)踐中得到了廣泛的應(yīng)用，是當(dāng)前同步電動(dòng)機(jī)普遍采用的一種啟動(dòng)方法。但是，由于勵(lì)磁繞組在啟動(dòng)過(guò)程中產(chǎn)生的單軸轉(zhuǎn)矩在半同步轉(zhuǎn)速(簡(jiǎn)稱半速)附近出現(xiàn)較大的起制動(dòng)作用的轉(zhuǎn)矩，使得合成的啟動(dòng)轉(zhuǎn)矩曲線出現(xiàn)較大的下凹，在大于半速附近形成*小轉(zhuǎn)矩，影響電動(dòng)機(jī)帶重載時(shí)的正常啟動(dòng)，使得啟動(dòng)時(shí)間延長(zhǎng)，甚至?xí)沟秒妱?dòng)機(jī)卡在半速狀態(tài)，使啟動(dòng)失敗。本文詳細(xì)分析了單軸轉(zhuǎn)矩隨轉(zhuǎn)速變化的特性及對(duì)同步電動(dòng)機(jī)啟動(dòng)過(guò)程的影響。
廈門岳航計(jì)算機(jī)工程有限公司
聯(lián)系人：李素云
企業(yè)QQ：2851195446，2851195466
手機(jī)：18965423501
座機(jī)：0592-5165501
異步全壓直接啟動(dòng)過(guò)程分析
同步電動(dòng)機(jī)的異步全壓起動(dòng)過(guò)程可以分為兩個(gè)不同的階段，異步階段和牽入階段。在異步階段(從起動(dòng)到準(zhǔn)同步轉(zhuǎn)速的過(guò)程)中存在著兩種轉(zhuǎn)矩——異步轉(zhuǎn)矩和單軸轉(zhuǎn)矩;牽入階段(從準(zhǔn)同步轉(zhuǎn)速加速到同步轉(zhuǎn)速的過(guò)程)也存在著兩種轉(zhuǎn)矩——同步轉(zhuǎn)矩和異步轉(zhuǎn)矩。起動(dòng)原理線路如圖1所示。
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