22B-D2P3F104

22B-D2P3F104

22B-D2P3F104 

电流控制PWM的基本思想是把希望输出的电流波形作为指令信号，把实际的电流波形作为反馈信号，通过两者瞬时值的比较来决定各开关器件的通断，使实际输出随指令信号的改变而改变。

空间电压矢量控制PWM(SVPWM)也叫磁通正弦PWM法。它以三相波形整体生成效果为前提，以逼近电机气隙的理想圆形旋转磁场轨迹为目的，用逆变器不同的开关模式所产生的实际磁通去逼近基准圆磁通，由它们的比较结果决定逆变器的开关形成PWM波形。此法从电动机的角度出发，把逆变器和电机看作一个整体，以内切多边形逼近圆的方式进行控制使电机获得幅值恒定的圆形磁场(正弦磁通)。具体方法又分为磁通开环式和磁通闭环式磁通开环法用两个非零矢量和一个零矢量合成一个等效的电压矢量，若采样时间足够小可合成任意电压矢量。

22B-D2P3F104 

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