描述
变频器(Variable-frequencyDrive,VFD)是应用变频技术与微电子技术,通过改变电机工作电源频率方式来控制交流电动机的电力控制设备。简言之,变频器是利用电力半导体器件的通断作用将工频电源变换为另一频率的电能控制装置,能实现对交流异步电机的软起动、变频调速、提高运转精度、改变功率因数、过流/过压/过载保护等功能。实现电机的变速运行的设备。变频器实际上就是一个整流逆变器。它首先是将交流电变为直流电,然后用电子元件对直流电进行开关变为交流电。一般功率较大的变频器用可控硅,并设一个可调频率的装置,使频率在一定范围内可调.用来控制电机的转数,使得转数在一定的范围内可调。
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