IC694MDL646
IC694MDL646
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Invensys Triconex 4351B 3700A 3805E 3503E 大量现货
Allen-Bradley(美国AB) 1756-L61 L62 L63 1756-ENBT大量现货
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IC694MDL646 AMB-HVI系列高压变频器输出采用多电平移相式PWM技术,同一相的功率单元输出相同幅值和相位的基波电压,但各载波之间互相错开一定电角度,实现多电平PWM,使得输出电压非常接近正弦波。输出电压的每个电平台阶只有单元直流母线电压大小,所以dv/dt很小,功率单元采用较低的开关频率,以降低开关损耗,但输出波形的等效开关频率可以达到单元开关频率的6倍,且输出电平数增加,输出相电压为13电平,线电压为25电平,电平数和等效开关频率的增加有利于改善输出波形,降低输出谐波,其输出波形如图3所示。
(图3 高压变频器的输出电压和电流波形)
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