產(chǎn)品詳情
1FK7060-2AF71-1RG1
程工 199 59282 717
1FK7060-2AF71-1RG1
在全社會電能消耗中,有70%左右耗費在工業(yè)領(lǐng)域,而工業(yè)電機的耗電量又占據(jù)整個工業(yè)領(lǐng)域用電的70%。提高電機效率可以主要通過2種方式,通過一個頻率轉(zhuǎn)換器,提高運作效率的交流電機;二是使用高效電機。不同的頻率轉(zhuǎn)換器是主要的工業(yè)領(lǐng)域的節(jié)能,節(jié)能效率一般在30%以上,在某些行業(yè)甚至高達40%-50%。高效電機的市場應(yīng)用比例仍然相對較低,能源效率標準和補貼政策的支持,未來高效電機的市場應(yīng)用比例將大幅上升
對于正常運行的定子繞組為三角形接法的鼠籠式異步電動機來說,如果在起動時將定子繞組接成星形,待起動完畢后再接成三角形,就可以降低起動電流,減輕它對電網(wǎng)的沖擊。這樣的起動方式稱為星三角減壓起動,或簡稱為星三角起動(y-δ起動)。采用星三角起動時,起動電流只是原來按三角形接法直接起動時的1/3。如果直接起動時的起動電流以6~7ie計,則在星三角起動時,起動電流才2~2.3倍。這就是說采用星三角起動時,起動轉(zhuǎn)矩也降為原來按三角形接法直接起動時的1/3。適用于無載或者輕載起動的場合。并且同任何別的減壓起動器相比較,其結(jié)構(gòu)最簡單,。除此之外,星三角起動方式還有一個優(yōu)點,即當負載較輕時,可以讓電動機在星形接法下運行。此時,額定轉(zhuǎn)矩與負載可以匹配,這樣能使電動機的效率有所提高,并因之節(jié)約了電力消耗。
這是利用了可控硅的移相調(diào)壓原理來實現(xiàn)電動機的調(diào)壓起動,主要用于電動機的起動控制,起動效果好但成本較高。因使用了可控硅元件,可控硅工作時諧波干擾較大,對電網(wǎng)有一定的影響。另外電網(wǎng)的波動也會影響可控硅元件的導(dǎo)通,特別是同一電網(wǎng)中有多臺可控硅設(shè)備時。因此可控硅元件的故障率較高,因為涉及到電力電子技術(shù),因此對維護技術(shù)人員的要求也較高
1FK2210-3AB01-0MB0
1FK2210-3AC01-0MB0
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