Compressor turns out to be the most electricity-consuming machine in a large number of enterprises. According to survey, 98% users tend to increase 15-25% air consumption on the base of original one, considering pressure loss when they choose compressor, which leads to the actual air consumption of most compressors turning out to be 50-70% of the rated one. However, the conventional compressor usually works best when its air consumption is 95% and also its efficiency will largely reduce with the decline of air consumption of users.

In order to solve this problem, many users choose to use the technology of variable-frequency to keep certain rotational speed of motor when the air consumption comes up to a certain average value. Although this is more energy-saving compared with conventional compressor, from the graph of energy efficiency we can tell that because the induction motor's energy efficiency will largely decline as the rotational speed slows down, the aim of energy saving can't be achieved. What's more, the stability of compressor will be largely reduced due to the increasing of the temperature of the motor.

In this case, the variable speed rotary screw compressor with permanent magnet motor produced by our MOAIR company, which includes every advantage of variable speed air compressor, synchronous motor and permanent magnet motor of rate earth, improves a lot in energy efficiency. Experiments and using experience of quantities of users prove that, using our MOAIR 's variable speed rotary screw compressor, 99% users can save 20-27% energy and 80% users can save 34-46% energy.

Compared with fixed speed rotary screw compressors and permanent magnet rotary compressors, variable speed rotary screw compressors offer significantly better energy efficiency without sacrificing performance.

Fixed Speed Rotary Screw Compressor
3 phase asynchronous variable speed screw air compressor
Permanent magnet synchronous variable speed screw air compressor
Actual Gas Consumption

① The PM motor and male rotor are directly connected on one shaft, without transmission efficiency loss as it does not require a gearbox and belt, ensuring 100% transmission efficiency.

② Equipped with high efficiency PM motor, high working efficiency can be ensured during the low speed. Also, the volume of the permanent magnet motor is 1/3 that of common motors.

③ PM motor is made using NdFeb permanent magnets, ensuring a long lifespan of 15 years.
The stator of the motor uses a corona-resistant enameled wire which is specially designed for frequency converters, and features excellent insulating properties and a long service life.
With soft starting method, the instant values of electric current when the motor starts is largely declined, which can protect the motor and other parts of air compressor.

④ Chinese government promotes high efficiency PM motor to use in all related industries.

⑤ Without motor bearing: motor rotor and male rotor of the compressor are mounted in one shaft, resulting in no bearing.

⑥ Top-level quality bearing.

⑦ Due to the innovative rotor profile, the equipped big rotor delivers larger displacement, lower speed and lower noise.

⑧ With specially designed seal structure, 100% oil leakage prevention is achieved, without trouble for the oil leakage.

⑨ The motor features a specially designed housing. Equipped with indepandent air-cooled cooling system, the motor doesn't need to work with compressor cooling system.