The difference between air compressor frequency and frequency conversion

The main difference between air compressor power frequency and frequency conversion is reflected in the following aspects:

1. Startup Characteristics

1. power frequency air compressor

   • start mode: Usually use direct start or star delta step-down start.
   • 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 Effect: The starting process is relatively rough and may have a greater impact on the mechanical system.

2. Variable frequency air compressor

   • start mode: The inverter is used to control the motor start to realize soft start.
   • Starting current: The starting current is small, the maximum is within 1.2 times of the rated current, and the impact on the power grid and the equipment itself is small.
   • Start Effect: The starting process is stable, which is beneficial to extend the service life of the equipment.

2. Operation Regulation and Energy Efficiency

1. power frequency air compressor

   • operating frequency: The operating frequency is fixed, generally 50Hz (or 60Hz, depending on the region).
   • Operation regulation: Usually the loading/unloading method is used to control the output gas volume, that is, loading when more gas volume is needed, and unloading when the gas volume needs to be reduced. This method is relatively poor in energy efficiency at part load, because the motor is still idling when unloading, consuming energy.
   • Energy efficiency performance: Energy efficiency is relatively low and energy waste exists.

2. Variable frequency air compressor

   • operating frequency: The operating frequency is adjustable, and the frequency range is usually between 0 and 50Hz, which can be intelligently adjusted according to the actual gas consumption.
   • Operation regulation: Adjust the speed of the motor by changing the power frequency to realize the stepless speed regulation of the compressor. This adjustment method improves the energy utilization rate and can maintain a high efficiency working state under various load conditions.
   • Energy efficiency performance: The overall energy saving effect can reach more than 20%, compared with the power frequency air compressor, it can save more than 30% of energy consumption.

3. pressure stability

1. power frequency air compressor

   • air pressure control: The air pressure is controlled by the upper and lower limit switches, and the working pressure and flow are relatively fixed.
   • barometric stability: When the load fluctuates greatly, it may not be possible to maintain the stability of the output pressure.

2. Variable frequency air compressor

   • air pressure control: Using the stepless speed regulation characteristics of the inverter, the controller or the PID regulator inside the inverter can achieve smooth start and fast response.
   • barometric stability: In the case of large gas fluctuations, it can quickly adjust the response and maintain the stability of the output pressure.

4. noise and vibration

1. power frequency air compressor

   • noise and vibration: Since the motor runs at a constant speed, loud noise and vibration may be generated due to impact during starting and loading.

2. Variable frequency air compressor

   • noise and vibration: Because the motor speed is adjustable, and in most cases it works below the rated speed, mechanical noise and wear are reduced, and the noise level is relatively low.

5. maintenance costs

1. power frequency air compressor

   • starting shock: Due to the large starting impact and the inability to intelligently adjust according to load changes, the degree of wear of the equipment may be higher and more frequent maintenance and maintenance are required.
   • Maintenance costs: Under long-term operation, maintenance costs are relatively high.

2. Variable frequency air compressor

   • starting shock: The starting impact is small, the operation is stable, and the speed can be automatically adjusted according to the load change, so the wear degree of the equipment is low.
   • Maintenance costs: Under long-term operation, the maintenance cost is relatively low.

6. applicable scenarios

1. power frequency air compressor

   • applicable Scenarios: It is suitable for occasions where the process demand changes less, the gas fluctuation is not high and the equipment cost is low.

2. Variable frequency air compressor

   • applicable Scenarios it is suitable for occasions where the process gas volume fluctuates greatly, the gas quality requirements are high or the energy efficiency requirements are high. At the same time, because of its good adaptability to the voltage fluctuation of the power grid, it is also suitable for areas with unstable voltage.

7. other features

1. power frequency air compressor

   • simple structure: The structure is relatively simple and the cost is low.
   • Simple control: The control system is relatively simple, easy to operate and maintain.

2. Variable frequency 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 runs in the best condition.
   • Remote management: Some high-end variable frequency air compressors support remote monitoring and management, which is convenient for users to know the equipment status and make adjustments at any time.
   • fault self-diagnosis: The system has a fault self-diagnosis function, which can find and deal with potential problems in time and reduce downtime.

To sum up, the variable frequency air compressor is superior to the power frequency air compressor in terms of starting characteristics, operation regulation and energy efficiency, air pressure stability, noise and vibration, maintenance cost and applicable scenarios. However, when choosing an air compressor, it is also necessary to consider comprehensively according to the specific usage scenario, budget and demand.