The difference between power frequency compressor and inverter compressor

Both power frequency compressors and inverter compressors are equipment used to compress air, and there are significant differences in many aspects. The following is a detailed comparison of the two compressors:

1. driving mode and working principle

• power frequency compressor:

  • driving mode: Driven by power frequency motor.
  • Working principle: 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.

• Inverter compressor:

  • driving mode: Driven by variable frequency motor.
  • Working principle: Adjust the speed of the motor through the electronic controller to change the air output and power of the compressor. The inverter compressor usually contains a variable frequency controller (inverter), which can convert the alternating current in the power grid into a square wave pulse output, and control the motor speed by adjusting the frequency of the square wave pulse.

2. performance characteristics

• power frequency compressor:

  • simple structure: Due to the use of power frequency motors and mechanical transmission, its structure is relatively simple.
  • easy maintenance: Due to the simple structure, the maintenance of the power frequency compressor is relatively easy.
  • price is relatively low: The manufacturing cost is low, so the market price is relatively low.
  • Air output and power are fixed: Unable to meet the needs of customized gas volume and power occasions.
  • extensive application: Because of its low price, simple structure and convenient maintenance, it is widely used in the fields of family, small car shop, medical treatment and chemical industry.

• Inverter compressor:

  • air output and power can be adjusted: It can automatically adjust the air output and power according to the change of load to meet the air volume and power requirements of different users.
  • Low energy consumption: By adjusting the motor speed to match the actual load, unnecessary energy consumption is avoided, thereby reducing production costs.
  • Smooth operation: Due to the use of advanced electronic control technology, the operation of the inverter compressor is more stable.
  • Low noise: The smoothness of operation also brings a reduction in noise.
  • Long life: Smooth operation and low wear extend the service life of the inverter compressor.
  • Higher price: Due to the use of advanced frequency conversion technology and complex electronic control systems, the manufacturing cost of frequency conversion compressors is relatively high, so the market price is relatively high.
  • Maintenance is more complex: The complex electronic control system also increases the difficulty and cost of maintenance.
  • Application occasions: It is suitable for occasions that require atmospheric volume, high pressure, frequent start and stop, and long-term operation, such as automobiles, manufacturing, and construction.

3. Startup and Operation Characteristics

• power frequency compressor:

  • large start-up impact the star-delta starting method is usually adopted, and the starting current is large (generally 5-8 times of the rated current), which will cause a greater 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.

• Inverter compressor:

  • small starting impact: The inverter has a soft start function, and the maximum starting current is within 1.2 times of the rated current, which greatly reduces the impact on the power grid and other electrical equipment.
  • High operation stability: Fast response to load changes through stepless speed regulation characteristics, which doubles the stability of air pressure.

In summary, there are significant differences between power frequency compressors and inverter compressors in terms of drive mode, working principle, performance characteristics, and start-up and operating characteristics. In the selection, should be based on specific application scenarios, load demand, budget and other factors for comprehensive consideration.