22B-D2P3F104

22B-D2P3F104 

電流控制PWM的基本思想是把希望輸出的電流波形作為指令信號，把實際的電流波形作為反饋信號，通過兩者瞬時值的比較來決定各開關器件的通斷，使實際輸出隨指令信號的改變而改變。

空間電壓矢量控制PWM(SVPWM)也叫磁通正弦PWM法。它以三相波形整體生成效果為前提，以逼近電機氣隙的理想圓形旋轉磁場軌跡為目的，用逆變器不同的開關模式所產生的實際磁通去逼近基準圓磁通，由它們的比較結果決定逆變器的開關形成PWM波形。此法從電動機的角度出發，把逆變器和電機看作一個整體，以內切多邊形逼近圓的方式進行控制使電機獲得幅值恒定的圓形磁場(正弦磁通)。具體方法又分為磁通開環式和磁通閉環式磁通開環法用兩個非零矢量和一個零矢量合成一個等效的電壓矢量，若采樣時間足夠小可合成任意電壓矢量。

22B-D2P3F104 

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