The difference between power frequency and frequency conversion of air compressor

The main differences between the power frequency and frequency conversion of the air compressor are reflected in the following aspects:

1. Startup characteristics

1. Industry frequency air compressor
   • Startup method: Direct start or star triangle step-down start is usually used.
   • Starting current: The starting current is large, generally 5 to 7 times the rated current, which will cause a greater impact on the power grid and the equipment itself.
   • Start-up effect: The startup process is relatively rough and may have a greater impact on the mechanical system.
2. Frequency converter air compressor
   • Start method: Use the inverter to control the motor starting to achieve soft start.
   • Starting current: The starting current is small, with a maximum of less than 1.2 times the rated current, and the impact on the power grid and the equipment itself is very small.
   • Start-up effect: The startup process is smooth, which is conducive to extending the service life of the equipment.

2. Operation regulation and energy efficiency

1. Energy frequency air compressor
   • Operation frequency: The operating frequency is fixed, generally 50Hz (or 60Hz, depending on the region).
   • Operation regulation: The load/unload method is usually used to control the output gas volume, that is, load when more gas volume is needed and unload when less gas volume is needed. This method performs relatively poor energy efficiency during partial loads because the motor is still idling during unloading, consuming energy.
   • Energy Efficiency Performance: Energy efficiency is relatively low, and energy waste occurs.
2. Frequency converter air compressor
   • Operation frequency: The operating frequency is adjustable, the frequency range is usually between 0~50Hz, and can be intelligently adjusted according to the actual gas volume.
   • Operation adjustment: Adjust the motor speed by changing the power supply frequency to achieve stepless speed regulation of the compressor. This regulation improves energy utilization and maintains a high-efficiency operating state under various load conditions.
   • Energy Efficiency Performance:The overall energy-saving effect can reach more than 20%, which can save more than 30% of energy consumption compared to the power frequency air compressor.

3. Air pressure stability

1. Energy frequency air compressor
   • Pneumatic pressure control: The air pressure is controlled through the upper and lower limit switches, and the working pressure and flow rate are relatively fixed.
   • Power Stability: When the load fluctuates greatly, the output pressure may not be stable.
2. Inverter air compressor
   • Air pressure control: Using the stepless speed regulation characteristics of the inverter, smooth start-up and rapid response are achieved through the controller or the PID regulator inside the inverter.
   • Air pressure stability: In the case of large fluctuations in the gas, the response can be quickly adjusted to maintain the stability of the output pressure.

IV. Noise and vibration

1. Industrial frequency air compressor
   • Noise and vibration: Because the motor runs at a constant speed, it may cause greater noise and vibration due to the impact during startup and loading.
2. Inverter air compressor
   • Noise and vibration: Since the motor speed is adjustable and in most cases it operates below the rated speed, mechanical noise and wear are reduced, and the noise level is relatively low.

5. Maintenance cost

1. Energy frequency air compressor
   • Starting impact: Due to the large start-up impact and the inability to intelligently adjust according to load changes, the wear degree of the equipment may be higher and more frequent maintenance and maintenance are required.
   • Maintenance cost: Under long-term operation, maintenance cost is relatively high.
2. Inverter air compressor
   • Starting impact: The start-up impact is small, the operation is stable, and the speed can be automatically adjusted according to the load changes, so the wear level of the equipment is relatively low.
   • Maintenance cost: Under long-term operation, maintenance cost is relatively low.

6. Applicable scenarios

1. Energy-frequency air compressor
   • Applicable scenarios: Suitable for occasions where there are fewer changes in process requirements, low requirements for gas volume fluctuations and low requirements for equipment costs.
2. Inverter air compressor
   • Applicable scenarios: Suitable for situations where the process gas volume fluctuates greatly, the gas volume and quality requirements are high, or the energy efficiency requirements are high. At the same time, because it has good adaptability to grid voltage fluctuations, it is also suitable for areas with unstable voltages.

7. Other features

1. Energy-frequency air compressor
   • Simple structure: relatively simple structure and low cost.
   • Simple control: The control system is relatively simple and easy to operate and maintain.
2. Inverter air compressor
   • Intelligent control: Equipped with an advanced control system, it can monitor and adjust operating parameters in real time, such as pressure, temperature, flow, etc., to ensure that the equipment operates in the best state.
   • Remote Management: Some high-end frequency converter air compressors support remote monitoring and management, making it easier for users to understand the equipment status and make adjustments at any time.
   • Fault Self-Diagnosis: The system has the function of self-diagnosis of faults, which can promptly detect and deal with potential problems and reduce downtime.

In summary, the frequency converter is better than the frequency converter in terms of starting characteristics, operation regulation and energy efficiency, air pressure stability, noise and vibration, maintenance costs and applicable scenarios. However, when choosing an air compressor, it is also necessary to consider comprehensively according to the specific use scenario, budget and needs.