《DSQC662邢台市畅销DSQC662》

《DSQC662邢台市畅销DSQC662》DSQC662变频器的输出和输出电流中,都含有很多高次谐波成份。除能形成电源无功损耗的较低次谐波外,还有许多频率很高的谐波成份。它们将以各种方式把本身的能量转达进来,形成对变频器自身和其它设备的搅扰信号。 (1)输出电流的波形 变频器的输出侧是二极管整流和电容滤波电路。明显只要电源的线电压UL大于电容器两头的直流电压UD时,整流桥中才有充电电流。因而,充电电流总是出如今电源电压的振幅值邻近,呈不接连的冲击波方式。它存在很强的高次谐波成份。有关材料剖明,输出电流中的5次谐波和7次谐波的谐波重量是较大的,分别是50HZ基波的80%和70%。 (2)输出电压与电流的波形 绝大多数变频器的逆变桥都选用SPWM调制方式,其输出电压为占空比按正弦规则漫衍的系列矩方式形波;因为电动机定子绕组的电感性质,定子的电流非常接近于正弦波。但其间与载波频率持平的谐波重量仍是较大的。DSQC662厦门光沃自动化设备有限公司秉持
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