1792D-16BVT0CD現(xiàn)貨;
1792D-16BVT0CD供應(yīng)。
當(dāng)采用變頻器運(yùn)轉(zhuǎn)時(shí),電機(jī)的起動(dòng)電流、起動(dòng)轉(zhuǎn)矩怎樣?采用變頻器運(yùn)轉(zhuǎn),隨著電機(jī)的加速相應(yīng)提高頻率和電壓,起動(dòng)電流被限制在150%額定電流以下(根據(jù)機(jī)種不同,為125%~200%)。用工頻電源直接起動(dòng)時(shí),起動(dòng)電流為6~7倍,因此,將產(chǎn)生機(jī)械電氣上的 沖擊。采用變頻器傳動(dòng)可以平滑地起動(dòng)(起動(dòng)時(shí)間變長(zhǎng))。起動(dòng)電流為額定電流的1.2~1.5倍,起動(dòng)轉(zhuǎn)矩為70%~120%額定轉(zhuǎn)矩;對(duì)于帶有轉(zhuǎn)矩自動(dòng)增強(qiáng)功能的變頻器,起動(dòng)轉(zhuǎn)矩為100%以上,可以帶全負(fù)載起動(dòng)。
往往客戶(hù)發(fā)現(xiàn)在說(shuō)明書(shū)上寫(xiě)著變速范圍60~6Hz,即10:1,那么在6Hz以下就沒(méi)有輸出功率嗎?在6Hz以下仍可輸出功率,但根據(jù)電機(jī)溫升和起動(dòng)轉(zhuǎn)矩的大小等條件,使用頻率取6Hz左右,此時(shí)電動(dòng)機(jī)可輸出額定轉(zhuǎn)矩而不會(huì)引起嚴(yán)重的發(fā)熱問(wèn)題。變頻器實(shí)際輸出頻率(起動(dòng)頻率)根據(jù)機(jī)種為0.5~3Hz.從電機(jī)再生出來(lái)的能量貯積在變頻器的濾波電容器中,由于電容器的容量和耐壓的關(guān)系,通用變頻器的再生制動(dòng)力約為額定轉(zhuǎn)矩的10%~20%。如采用選用件制動(dòng)單元,可以達(dá)到50%~100%。
在工業(yè)控制領(lǐng)域中,絕大多數(shù)是電動(dòng)控制系統(tǒng),其終的控制對(duì)象和執(zhí)行機(jī)構(gòu)均為電機(jī),電機(jī)的自動(dòng)控制系統(tǒng)往往都是通過(guò)控制轉(zhuǎn)速來(lái)實(shí)現(xiàn)的。上世紀(jì)八十年代,隨著電力電子技術(shù)的發(fā)展,在國(guó)外交流變頻調(diào)速技術(shù)在電機(jī)控制系統(tǒng)中開(kāi)始工業(yè)應(yīng)用,一九九五年以來(lái),該技術(shù)傳到大陸,近幾年在我國(guó)的應(yīng)用也越來(lái)越廣?,F(xiàn)在在國(guó)外,交流調(diào)速傳動(dòng)系統(tǒng)在很大程度上已取代了直流調(diào)速系統(tǒng)而上升為電氣調(diào)速傳動(dòng)的主流。
9) 人世有代謝,往來(lái)成古今。(唐·孟浩然《與諸子登峴山》)
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