BEEST----AIR COMPRESSOR&SOLUTION
Moair Energy Conservation Durable Two Stage Screw Air Compressor with Double Permanent Magnet Motor
1. Company background
Tianjin Beest International Trade Co., Ltd. is the senior partner of Suzhou Moair Compressor Co., Ltd , we are committed to the sales and after-sales service of air compressors in Southeast Asia, and have stores in Indonesia.
We are the professional manufacturer of the air compressor products of various types including the permanent-magnet synchronous variable-frequency series,permanent-magnet synchronous low-pressure series,permanent-magnet sunchronous two-stage compressors series,etc.
More than 10 years of professional screw compressors manufacturing technology,bringing the international first-class permanent magnet synchronous drive and control technologies.
2. Product introduction
L series permanent magnet rotary screw air compressor 3-5 bar are specially developed for industries that need low air pressure operation such as textile, cement, glass and food. With a low pressure range from 3 bar to 5 bar, the power range of L series is from 37kw to 132kw and the air delivery of that is from 8.34m3/min to 85.82m3/min.
The main engine is a low pressure design developed by MOAIR instead of an ordinary one. When a low pressure compressor is equipped with a common main engine, the air will be largely compressed first and then released, which will lead to unnecessary high energy consumption. However, a professional low pressure main engine will save 10%-20% energy compared with common compressors.
The industrial rotary screw air compressors are equipped with motors with a protection degree of IP54 and inovance frequency inverter, which turn out to be effective, energy-saving, structure-compact and lower noise.
3.Core components
Motor
- More stable: no mechanical transmission troubles
There is no gear shaft in the air compressor and the effective permanent magnet motor and the male rotor are directly connected on one shaft without gear drive, which can eliminate pitting of gear or hidden troubles of tooth fracture.
Without shaft coupling, two integrated PM motors directly drive two airends of the air compressor, avoiding the hidden troubles of shaft coupling failure.
- More energy-savings: the airend is always in a smooth running state
The two stage 3 phase permanent magnet rotary gear screw air compressor of MOAIR is powered by two independent PM motors and two independent inverters, which is intelligently controlled such as keep the airend running at a best level-pressure point by controlling discharge pressure and interstage pressure under the circumstance of different rotary speed and different pressure. The best running speed of air compressor can be automatically calculated while running and then the compression ratio can be balanced by final match, which can keep the compressor in a best running state, thus obtaining the highest efficiency.
- More effective: high-efficiency permanent magnet motor and no gear drive loss.
With a motor of a high protection degree of IP54, it is more energy-saving and it can stay effective at low frequency and low speed.
- More environment-friendly operation with lower noise
No noise of motor bearings, gear meshing and coupling transmission.
- More structure-compact
The volume of PM motor is small and the structure is compact, which can save much space.
4.Specifications and parameters
Examples of comparison of low pressure compressor's and common compressor's working conditions in the low pressure state:
When users' actual need for pressure is 0.4MPa, however, if a 0.8MPa one was used in this case, the compressor will compress the air to 0.8MPa first and then reduce it to 0.4MPa by pressure-reducing valve or other ways. That is to say, the 0.8MPa energy consumption is taken by users.
For example, the actual air delivery of 45kw/0.4MPa low pressure compressor of MOAIR is 10.84 m3min and the actual work is 44.8KW and the specific power is 4.13kw/m3. However, the specific power of common 45kw/0.8MPa compressor is 8.1kw/m3, according to the two level energy efficiency calculation. In this case, professional 0.4MPa low pressure compressor can save nearly 49% energy compared with common ones.
5.Principle of energy-saving
- Change the traditional induction motor with high-efficiency technology of permanent magnet rotary screw motor, thus reducing the consumption in transmission.
- Powered by two independent PM motors and two independent inverters, the compressor is intelligently controlled such as keep the airend running at a best level-pressure point by controlling pressure of air flow and interstage pressure under the circumstance of different rotary speed and different pressure. The best running speed of compressor can be automatically calculated while running and then the compression ratio can be balanced by final match, which can keep the compressor in a best running state, thus obtaining the highest efficiency.
- Because the gear ratio is fixed, point efficiency is emphasized in this case. That is to say, only with fixed rotary speed and rated pressure did it have the best specific power. When running in a state of variable speed and variable frequency, considering the fixed speed of gear, interstage pressure will not reach the best one. Rotational speed declining while energy consumption not declining at the same time, it is not suitable for running in variable speed and variable frequency state.
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