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利用電力半導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。可分為交—交變頻器，交—直—交變頻器。交—交變頻器可直接把交流電變成頻率和電壓都可變的交流電；目前使用的變頻器主要採用交—直—交方式（VVVF變頻或矢量控制變頻），先把工頻交流電源通過整流器轉換成直流電源，然後再把直流電源轉換成頻率、電壓均可控制的交流電源以供給電動機。在當今工業社會，環保和節能顯得越來越重要，而變頻器在工業節能中發揮著越來越大和不可忽視作用。
關鍵詞：變頻器、運動控制、整流器、逆變器
前言
變頻器是係統中的功率變換器。目前的運動控制係統已包含多種學科的技術領域，總的發展趨勢是驅動的交流化、功率變換器的高頻化、控制的數字化、智能化和網絡化。
隨著新型電力電子器件和微處理器的應用以及控制技術的發展，變頻器的性能價格比越來越高，體積越來越小，而且廠家仍在不斷地提高可靠性，為實現變頻器的進一步小型輕量化、化和多功能化以及無公害化而做著新的努力。辨別變頻器性能的優劣，一要看其輸出交流電壓的諧波對電機的影響；二要看對電網的諧波污染和輸入功率因數；後還要看本身的能量損耗。
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