描述
变频空调的制冷制热速度快，室内温差小，舒适性好，如果每次开机的时间很长的话，就能充分发挥其节电的优势，但如果开机时间短，就无法发挥其节电的优势了。
流变频压缩机转子采用了交流感应电机转子结构，其工作原理为：定子产生旋转磁场，转子在定子旋转磁场作用下感应电流产生感应磁场，经定子磁场与转子磁场相互作用使转子旋转。交流变频压缩机旋转的基础是定子与转子的电磁感应，使压缩机旋转的同时也带来了电磁感应噪音与转子损耗等负面作用。
直流变频压缩机转子采用稀土永磁材料制作而成，其工作原理为：定子产生旋转磁场与转子永磁磁场直接作用，实现压缩机运转。可以通过改变送给电机的直流电压来改变电机的转速，直流变频压缩机不存在定子旋转磁场对转子的电磁感应作用，克服了交流变频压缩机的电磁噪音与转子损耗，具有比交流变频压缩机效率高与噪音低特点，直流变频压缩机效率比交流变频压缩机效率高10%-30%，噪音低5分贝-10分贝。但是，直流变频空调的成本要高于交流变频空调。要比较两者差异，首先必须先对两者的结构做个了解：
若要实现直流电机调速，可以有以下几种方法
在绕组内串联电阻，减小I这种方法增加了拖动系统的损耗，机械性能变“软”，现在基本不用了。
调节电枢绕组电压U，这是迄今为止公认最好的一种调速方式，具有以下特点：
调速后的机械特性不变，速度降落只随电枢电压而变。
实现无级调速，零速起调
由于主磁通不变，电动机额定电流也不变，因此调速过程具有“恒转距”特性。
调节主磁通（因为增加磁通会导致磁路饱和，只能减小磁通，因此此方法又称为“弱磁调速”。其特点是转速下降较快，但电动机输出功率不变，呈现“恒功率”特性。
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