Energy saving permanent Magnet Motor VSD screw air compressor  11Kw 15HP with Dryers built in  1. Energy saving 30-50% on average by permanent Magnet Motor VSD screw air compressor  . 2.high volume,high efficiency. 3.Permanent magnetic electric motor 100% transmission 4.Intelligent touch screen control panel 5.Unique design with inverter to  protect from short phase, phase short circuit, ground short circuit, over current, over voltage, under voltage, overload, overheating, motor thermal protections etc. 6.Air dryer and adsorption dryer built in to save space and installation cost.