The difference between permanent magnet inverter compressor and power frequency

There are significant differences between permanent magnet inverter compressors and power frequency compressors in many aspects. The following is a detailed comparison:

1. working principle

• permanent magnet inverter compressor:

  • working principle: The permanent magnet synchronous motor drives the main shaft of the compressor to rotate, which in turn drives the compression parts such as the piston or screw inside the compressor to work. At the same time, the frequency conversion control system adjusts the operating frequency and power of the motor according to the actual demand, and realizes the stepless speed regulation of the compressor.

• power frequency compressor:

  • working principle: Using power frequency motor drive, the rotation of the motor is converted into the work of the compressor through mechanical transmission. During its operation, the speed of the motor is constant, so the air output and power of the compressor are also fixed.

2. performance characteristics

• permanent magnet inverter compressor:

  • energy saving and high efficiency: Because the motor speed can be adjusted according to the actual load, unnecessary energy consumption is avoided. Compared with traditional power frequency compressors, the energy saving effect is remarkable.
  • High stability: The frequency conversion control system enables the compressor to run smoothly and reduces the instability of air pressure caused by load fluctuations.
  • Low noise: The motor runs smoothly, reducing mechanical vibration and noise.
  • Low maintenance costs: Due to stable operation and low wear of mechanical parts, the maintenance cost is relatively low.

• power frequency compressor:

  • simple structure: Using power frequency motor and mechanical transmission, the structure is relatively simple.
  • easy maintenance: Due to the simple structure, repair and maintenance are relatively easy.
  • price is relatively low: The manufacturing cost is low, so the market price is relatively low.

3. Application Scenarios

• permanent magnet inverter compressor:

  • applicable occasions: It is more suitable for occasions that require frequent start and stop, long-term operation, and high requirements for air pressure stability, such as automobile manufacturing, textiles, electronics, food and other fields.

• power frequency compressor:

  • applicable occasions: It is more suitable for occasions where the load is relatively stable and the air pressure stability is not high, such as family, small car, medical and chemical fields.

4. Startup and Operation Characteristics

• permanent magnet inverter compressor:

  • small starting impact: The inverter has a soft start function, the starting current is small, and the impact on the power grid and other electrical equipment is small.
  • High operation stability: Realize stepless speed regulation through frequency conversion control, which can quickly respond to load changes and keep the air pressure stable.

• power frequency compressor:

  • large start-up impact: The star-delta starting method is usually adopted, and the starting current is large, which will cause a large impact on the power grid and other electrical equipment.
  • Normal operation stability: Because the air output and power are fixed, it cannot be adjusted according to load changes, so the operating stability is limited.

In summary, there are significant differences between the permanent magnet inverter compressor and the power frequency compressor in terms of working principle, performance characteristics, application scenarios, and starting and operating characteristics. In the selection, should be based on specific application scenarios, load demand, budget and other factors for comprehensive consideration.