永磁变频空压机近两年来在空压机行业成为节能先锋的代名词，甚至有些空压机厂家以“不用钱买的空压机”作广告宣传词来吸引用户的眼球。
Permanent magnet variable frequency air compressors have become synonymous with energy-saving pioneers in the air compressor industry in the past two years. Some air compressor manufacturers even use "air compressors without money" as advertising words to attract the attention of users.
当然，永磁电机节能，相对意义来讲，用同样的控制方法肯定比传统的异步电机高。节能的要点是80%的空压机处于变量负载状态，根据用气量的多少用变频调速来自动满足用户的需求，减少无用功的损耗。
Of course, the energy saving of permanent magnet motor is relatively higher than that of traditional asynchronous motor with the same control method. The key point of energy saving is that 80% of the air compressors are in variable load state. According to the amount of gas consumption, frequency conversion speed regulation is used to automatically meet the needs of users and reduce the loss of reactive work.
但还有20%的场合是满压满负载，这种场合采用变频控制异步电机比直接启动还要耗能，因为变频器本身是IGBT以开关方式控制频率的高低，它本身有额定功率2～3%需损耗的。
However, 20% of the cases are full voltage and full load. In this case, using frequency conversion to control asynchronous motor consumes more energy than direct starting, because the frequency converter itself is IGBT to control the frequency by switching, and it has 2 ~ 3% of the rated power to be lost.