SK-U1-CVR2-CC

SK-U1-CVR2-CC;
SK-U1-CVR2-CC現(xiàn)貨；
SK-U1-CVR2-CC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。


　　11、好學(xué)近乎知，力行近乎仁，知恥近乎勇?！吨杏埂?br /> ————————————————————
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