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·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(guò)改變電機(jī)工作電源頻率方式來(lái)控制交流電動(dòng)機(jī)的電力控制設(shè)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(dòng)單元、驅(qū)動(dòng)單元、檢測(cè)單元微處理單元等組成。
變頻器靠?jī)?nèi)部IGBT的開(kāi)斷來(lái)調(diào)整輸出電源的電壓和頻率，根據(jù)電機(jī)的實(shí)際需要來(lái)提供其所需要的電源電壓，進(jìn)而達(dá)到節(jié)能、調(diào)速的目的，
另外，變頻器還有很多的保護(hù)功能，如過(guò)流、過(guò)壓、過(guò)載保護(hù)等等。
隨著工業(yè)自動(dòng)化程度的不斷提高，變頻器也得到了非常廣泛的應(yīng)用?！?br />
·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(dòng)機(jī)控制需要。
通過(guò)功能、選項(xiàng)和包裝組合實(shí)現(xiàn)應(yīng)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(yīng)用需求的解決方案?！?br />
·Allen-Bradley PowerFlex系列變頻器的設(shè)計(jì)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(lái)一種開(kāi)箱即用和集成。·
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·Allen-Bradley PowerFlex 4系列變頻器為設(shè)備級(jí)別、單獨(dú)控制應(yīng)用或簡(jiǎn)單的系統(tǒng)集成提供一種簡(jiǎn)單的解決方案。
這種通用的變頻器種類設(shè)計(jì)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(yīng)用的通用性?！?br />

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