Features 1Save the loss during unloading. When the gas volume of the fixed-frequency screw machine fluctuates, the motor will consume 45% of electricity when it is unloaded; the permanent-magnet inverter air compressor is not unloaded, and there is no waste. 2 to save the loss of pressure difference. In order to avoid the frequent start of the impact on the unit and the power grid, the fixed-frequency screw machine sets the 1-2BAR differential pressure; the variable-frequency screw air compressor can start and stop indefinitely, only one pressure point. Each time the pressure difference is 0.14 BAR, the system energy saving is 5~7%. 3 Save energy consumption at startup. The starting current of the fixed-frequency screw air compressor is 3-6 times of the rated current, and the frequent start-up greatly consumes electricity; the permanent-magnet inverter air compressor starts with a soft start, and the maximum current does not exceed the rated current.