目前，我国的一些电动设备如风机、水泵、压缩机、大型空调和电动机等其用电量占全国总用电量的70%左右，但它们的使用效率较低。就其控制流量和风力而言，风机、水泵和压缩机等大都是挡风板或节流阀来控制，这种控制方式效率低下，浪费了大量的能源。在电动设备中应用变频调速技术，可提高设备的运行效率，同时又能达到节能的目的。本文针对变频调速技术在电动设备中的应用作以分析。
　　变频调速的节电原理，变频调速的基本原理异步电机采用变频调速的原理是：通过整流桥将工频交流电压变为直流电压，再由逆变器转换为频率可调的交流，作为交流异步电机的的驱动电源，使电机获得无级调速所需的电压和电流，是一种无附加转差损耗调速方式。变频调速分为两种方法：交―直―交变频和交―交变频。前者适用于高速小容量电机，后者适用于低速大容量拖动系统。可知，通过改变电源的频率能连续地调节转子的转速。

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