用于電機(jī)控制的變頻器，既可以改變電壓，又可以改變。
變頻器的工作原理
我們知道，交流電動機(jī)的同步轉(zhuǎn)速表達(dá)式位：
n＝60 f(1－s)/p (1)
式中
n———異步電動機(jī)的轉(zhuǎn)速；
f———異步電動機(jī)的；
s———電動機(jī)轉(zhuǎn)差率；
p———電動機(jī)極對數(shù)。
由式(1)可知，轉(zhuǎn)速n與f成正比，只要改變f即可改變電動機(jī)的轉(zhuǎn)速，當(dāng)f在0～50Hz的范圍內(nèi)變化時，電動機(jī)轉(zhuǎn)速調(diào)節(jié)范圍非常寬。變頻器就是通過改變電動機(jī)電源實現(xiàn)速度調(diào)節(jié)的，是一種的率、高性能的調(diào)速手段。
【公 司】： 福建鴻飛達(dá)自動化科技有限公司
【主 營】： AB(羅克韋爾)PLC全系列、ABB機(jī)器人備件、施耐德140/TSX、西門子6SN/6FC、伺服全套等
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