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中间直流环节

逆变器的负载主要是异步电动机，属于感性负载。无论电动机处于电动或发电制动状态，其功率因数总不会为1，因此在中间直流环节与电动机之间总会有无功功率的交换，这种无功能量要依靠中间直流环节的电容器或电抗器等储能元件来缓冲。

中间储能元件采用大容量的电容，并联在直流环节上，电容两端的电压不能突变，因此直流环节的电压比较稳定，相当于恒压源。

中间储能元件改为一个大的串联电感，直流部分就相当于一个恒流源。根据中间电路储能元件的不同，变频器可分为电压源型和电流源型。

停产数控伺服备件

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