Application of frequency conversion air compressor with more than 20 m3/min will control discharge pressure fluctuations within the scope of 0.1bar and extend equipment service life. It can supply high quality compressed air, precisely change the rotation speed of the main motor as per air flow required to reduce the consumption of energy to achieve the purpose of energy saving. The income from the energy saving exceeds greatly the purchase price of the air compressor its self and it is the first choice for you in purchasing of the air compressor.