描述

變頻器（Variable-frequencyDrive，VFD）是應(yīng)用變頻技術(shù)與微電子技術(shù)，通過改變電機工作電源頻率方式來控制交流電動機的電力控制設(shè)備。簡言之，變頻器是利用電力半導(dǎo)體器件的通斷作用將工頻電源變換為另一頻率的電能控制裝置，能實現(xiàn)對交流異步電機的軟起動、變頻調(diào)速、提高運轉(zhuǎn)精度、改變功率因數(shù)、過流/過壓/過載保護(hù)等功能。實現(xiàn)電機的變速運行的設(shè)備。變頻器實際上就是一個整流逆變器。它首先是將交流電變?yōu)橹绷麟?，然后用電子元件對直流電進(jìn)行開關(guān)變?yōu)榻涣麟?。一般功率較大的變頻器用可控硅，并設(shè)一個可調(diào)頻率的裝置，使頻率在一定范圍內(nèi)可調(diào).用來控制電機的轉(zhuǎn)數(shù)，使得轉(zhuǎn)數(shù)在一定的范圍內(nèi)可調(diào)。

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