the first energy-saving operation of permanent magnet frequency conversion screw machine is to adjust the speed of the motor by frequency converter to adjust the gas flow, so that the output power of the motor is proportional to the flow demand, to keep the motor efficient work, high power factor, small reactive power loss, energy-saving effect is obvious. the second is the automatic fast hibernation makes the no-load time shorter, the motor completely stopped, can maximize energy saving. It is worth mentioning that in its operation, when the exhaust volume is reduced, the speed of the motor is slowed down, the noise of the air compressor is smaller than that of the full speed operation, and with the reduction of the unloading operation time, the empty noise is also reduced.