Screw air compressor power frequency and permanent magnet

Screw air compressors are mainly divided into two types: power frequency and permanent magnet frequency conversion, which are significantly different in terms of working principle, performance, and applicable scenarios.

1. power frequency screw air compressor

• working principle: The motor of the power frequency screw air compressor has a fixed speed, which is converted into direct current through three-phase alternating current, and the controller is used to complete the control of the air compressor. Therefore, its output pressure and flow are fixed.

• Performance characteristics:

  • the manufacturing cost is relatively low, and the price is relatively close to the people, which is suitable for small and medium-sized enterprises.
  • The operation stability is good, no need to consider the influence of voltage change on its work, and it can adapt to the fluctuation of power grid well.
  • It performs well in terms of efficiency and energy consumption, but it cannot automatically adjust the output power according to actual usage, and the energy-saving effect is limited.

• Applicable Scenarios: Suitable for some occasions that require lower voltage stabilization requirements, such as ordinary construction sites.

2. permanent magnet variable frequency screw air compressor

• working principle: The permanent magnet variable frequency air compressor adopts a zero magnetic moment permanent magnet and a frequency converter control system inside the motor to realize the adjustable speed control of the air compressor motor. This control mode can be customized according to different use requirements, different output pressure and flow.

• Performance characteristics:

  • it can automatically adjust the output power according to the actual use, and the energy saving effect is remarkable. Compared with the power frequency air compressor, it can save more than 30% of energy.
  • The output power range is wide, which can meet the needs of different working conditions.
  • Long service life, up to more than 100000 hours, and low operating noise.
  • Small size, light weight, easy to install and maintain.

• Applicable Scenarios: It is suitable for occasions with high air quality requirements and energy saving, such as medicine, electronics and other industries.

3. Summary

the power frequency screw air compressor and the permanent magnet variable frequency screw air compressor have their own advantages and disadvantages. Which type of air compressor to choose depends on the specific application scenarios and requirements. If the company pays more attention to cost and stability, and the air quality requirements are not particularly high, you can choose a power frequency screw air compressor; if the company pays more attention to energy-saving effects and service life, and has higher requirements for air quality, then permanent magnet frequency conversion Screw air compressor will be a better choice. At the same time, with the continuous advancement of technology and the gradual reduction of costs, permanent magnet variable frequency screw air compressors are expected to be widely used in more fields.