What is a permanent magnet variable frequency air compressor

In the past two years, permanent magnet variable frequency air compressor has become synonymous with energy-saving pioneers in the air compressor industry. Even some air compressor manufacturers use "air compressor without money" as an advertising slogan to attract users' attention.

Of course, the permanent magnet variable frequency air compressor motor energy saving, relatively speaking, with the same control method is certainly higher than the traditional asynchronous motor. The key point of energy saving is that 80% of the air compressors are in variable load state, and frequency conversion speed regulation is used to automatically meet the needs of users according to the amount of gas consumption, thus reducing the loss of useless work.

Permanent magnet variable frequency air compressor

however, there are still 20% of the occasions with full pressure and full load. In this case, the use of frequency conversion to control asynchronous motors consumes more energy than direct starting, because the frequency converter itself controls the frequency level by switching IGBT, and it itself has a rated power of 2 ~ 3% and needs to be lost.

Therefore, in this case, the energy-saving effect of frequency conversion control will not be obvious even if permanent magnet motors are used. However, the current national standard assessment of the energy efficiency level of air compressors is still based on the specific power at full pressure and full load. Only high-precision screw heads with high-efficiency motors and reasonable layout design of air compressors can achieve the specific power of level 1 energy efficiency. Therefore, many screw machines using frequency conversion control are difficult to achieve level 1 energy efficiency level.

Therefore, the energy-saving evaluation of permanent magnet variable frequency air compressor should be determined according to the working conditions, and the evaluation basis is not yet complete. At least, the evaluation concept of variable working conditions is relatively shallow, and there is no standard of "Technical Conditions for Variable Frequency (Variable) Air Compressor" to determine the energy efficiency level of variable frequency (permanent magnet) air compressor. At present, there are two ways to choose the permanent magnet air compressor on the market, one is the more popular all-in-one machine type, and the other is the split direct connection type. Here are their advantages and disadvantages.

what are the advantages of permanent magnet variable frequency air compressor?

In the air compressor industry, the market share is higher in addition to the screw air compressor and oil-free air compressor, followed by the permanent magnet variable frequency air compressor, why is the permanent magnet variable frequency air compressor so popular in the air compressor market? Mainly because it has the following advantages:

1 Start without impact

the permanent magnet frequency conversion air compressor has a soft start function, and the impact on the machine is very small when starting.

2, low noise

the permanent magnet variable frequency air compressor works below the rated speed in most cases, which will reduce the noise and wear of the main engine a lot, thus prolonging the maintenance time and service life of the machine.

3. Stable air pressure

because the permanent magnet variable frequency air compressor uses the invincible speed regulation characteristics of the frequency converter, through the controller or the PID regulator of the internal regulator, it can start smoothly and slowly, and can quickly respond to occasions with large fluctuations in gas consumption.

4. Variable flow control

we all know that the power frequency air compressor can only work in one displacement, while the frequency conversion air compressor is different, it can work in a relatively wide range of displacement. The frequency converter is based on the actual gas consumption to adjust the motor speed in real time to control the displacement. When the gas consumption is low, the air compressor can also be automatically dormant, thus greatly reducing the loss of energy. The optimized control strategy can further improve the energy saving effect.

these are the main advantages of permanent magnet variable frequency air compressor, and it is also the main reason why it is loved by users.