變頻器（Variable-frequency Drive，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。變頻器主要由整流、濾波、逆變、制動單元、驅(qū)動單元、檢測單元微處理單元等組成。
變頻器主要是靠內(nèi)部IGBT的開斷來調(diào)整輸出電源的電壓和頻率，根據(jù)電機的實際需要來提供其所需要的電源電壓，進而達到節(jié)能、調(diào)速的目的。變頻器有很多的保護功能，如過流、過壓、過載保護等。隨著工業(yè)自動化程度的不斷提高，變頻器也得到了非常廣泛的應(yīng)用。
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