富士FRN 0005 C2S-4C 紧凑型低压变频器
电压空间矢量(SVPWM) 它是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,一次生成三相调制波形,以内切多边形逼近圆的方式进行控制的。经实践使用后又有所改进,即引入频率补偿,能消除速度控制的误差;通过反馈估算磁链幅值,消除低速时定子电阻的影响;将输出电压、电流闭环,以提高动态的精度和稳定度。但控制电路环节较多,且没有引入转矩的调节,所以系统性能没有得到*。
富士FRN 0005 C2S-4C 紧凑型低压变频器
Can eliminate the error of speed control; The influence of the stator resistance at low speed is eliminated by the feedback estimation of the magnetic chain amplitude. The output voltage and current are closed to improve the dynamic accuracy and stability. However, there are more control circuit and no torque adjustment is introduced, so the system performance is not improved at all.
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