谐波实际上是一种干扰量,系指x一个周期电气量的非正弦波分量,其频率为基波频率的整数倍。每个谐波都有不同的频率、幅值与相角,高次谐波频率与基波频率的比值称为谐波次数,有偶次谐波与奇次谐波之分。一般讲奇次谐波造成危害比偶次谐波更大,在三相整流负载中出现谐波为3、5、7、11、13……次谐波。
同理,在逆变输出回路中,输出电流信号受载波信号调制而变成脉冲波形,其波形按傅立叶级数进行分解,也分得基波和各次谐波。据此,变频器运行中必然会产生高次谐波,当频率可变的并含有颇丰高次谐波交流输入配套电动机,必将对异步电动机造成不良的影响。TABAI ESPEC CORP I/O EXPANDER UNIT FOR EX-101 EX-P-8601
TABAI ESPEC CORP I/O EXPANDER UNIT FOR EX-101 EX-P-8601
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