高功率因数变频调速的节能应用

The high power factor control used in economization on energy

本文介绍了对诸如风机等经常运行于欠载或轻载状态的机械进行节能控制的新方法。采用对电机的功率因数进行控制．使对异步电动机进行变频调速时保持较高的功率因数,降低电机的无功损耗,从而使电机在欠载运行时有明显的节能效果。

This paper introduces a new method of economize energy in fans that usually run under load, which is to control the power factor and keep it at a much greater value when the asynchronous motor＇s voltage and frequency are varying. In this way, the dissipatio npower can decrease, so it can save energy well when the motor runs under load.