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·變頻器（Variable-frequency Drive，VFD）是應用變頻技術與微電子技術，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備。
變頻器主要由整流（交流變直流）、濾波、逆變（直流變交流）、制動單元、驅動單元、檢測單元微處理單元等組成。
變頻器靠內(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，
另外，變頻器還有很多的保護功能，如過流、過壓、過載保護等等。
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用。·

·Allen-Bradley PowerFlex系列變頻器提供廣泛的控制模式，幾乎能滿足任何電動機控制需要。
通過功能、選項和包裝組合實現(xiàn)應用通用性，幫助滿足安全要求、編程以及配置的方便，PowerFlex系列擁有一種能夠滿足您的應用需求的解決方案?！?br />
·Allen-Bradley PowerFlex系列變頻器的設計目的就是為您提供覆蓋所有電壓以及廣泛額定功率的完整產(chǎn)品組合，帶來一種開箱即用和集成?！?br /> ·
·Allen-Bradley PowerFlex 4系列變頻器為設備級別、單獨控制應用或簡單的系統(tǒng)集成提供一種簡單的解決方案。
這種通用的變頻器種類設計目的即為了使用方便，提供一種緊湊包裝以優(yōu)化面板空間和應用的通用性。·

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