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變頻器的分類方法

發布時間:2021-07-21   點擊次數:192次
   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。變頻器靠內部IGBT的開斷來調整輸出電源的電壓和頻率,根據電機的實際需要來提供其所需要的電源電壓,進而達到節能、調速的目的,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。隨著工業自動化程度的不斷提高,變頻器也得到了非常廣泛的應用。
  變頻器是將工頻功率(50赫茲或60赫茲)轉換成各種頻率的交流電源,實現電動機的變速運行的設備??刂齐娐房刂浦麟娐?,整流電路將交流電轉換為直流電,直流中間電路使整流電路的輸出平滑,逆變電路將直流電逆變成交流電。對于矢量控制逆變器,它需要大量的計算,有時還需要一個CPU來進行轉矩計算相應的電路。變頻調速是通過改變電動機定子繞組的供電頻率來達到調速的目的。
  變頻器分類:
  變頻器的分類方法有很多種。根據主電路的工作方式,可分為電壓型逆變器和電流型逆變器;按開關方式可分為PAM控制型逆變器、PWM控制型逆變器和高載頻PWM控制型逆變器;按工作原理可分為v/F控制型逆變器,轉差變頻調速逆變器和矢量控制逆變器按應用分類,可分為通用變頻器、高性能專用變頻器、高頻變頻器、單相變頻器和三相變頻器。
  VVVF:變壓、變頻CVCF:恒壓、恒頻。各國使用的交流電源的電壓和頻率是400V/50Hz或200V/60Hz(50Hz)等,通常把固定電壓和頻率的交流電轉換成可變電壓或頻率的交流電的裝置稱為“變頻器”。為了產生可變電壓和頻率,該裝置首先將電源的交流電轉換為直流電(DC)。
  用于電機控制的變頻器可以同時改變電壓和頻率。
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