產地:xrda0907 |
依據雙DSP矢量操控的三相籠型異步電機驅動體係的變頻器選用交直交電壓型構造和SVPWM脈寬調制辦法。體係由三相整流器、濾波電容、電壓型逆變器、逆變器驅動電路、三相籠型異步電機和雙DSP操控體係構成。
其間雙DSP操控體係由VC33子體係,F240子體係和數據溝通單元三有些構成。矢量操控以VC33芯片為中心,用來完結矢量操控中心算法,及兩相電流檢查。F240完結三相PWM波形生成,電機測速及過壓維護功用。數據溝通有些選用雙端口RAM,可使兩個DSP芯片敏捷、便當地溝通數據,增強了雙DSP體係的並行處理才幹。
矢量變頻器*節能條件
變頻器在工頻下運轉,具有節省用電功用,是事實。可是他的前提條件是:第一,大功率而且為風機/泵類負載;第二,設備本身具有節省用電功用(軟件支撐);第三,長時刻接連運轉。這是體現節省用電作用的三個條件。除此之外,無所謂節不節省用電,沒有什麼含義。通常溝通電動機的機械特性曲線是必定的,理論和實習都已證實,當負載功率小於電動機的額定功率時,其功率跟著負載轉矩的削減而下降,也即是說,電動機輕載時會相對費電。而變頻器會依據負載的巨細主動調整V/f值(其間V為電動機定子繞組的電壓,f為定子繞組的電壓改動頻率),改動電動機的機械特性曲線,使其與負載相習慣,然後使功率得到前進,抵達節能之意圖。
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