2026-04-14Views：
The power frequency and frequency conversion in the screw air compressor mainly refer to the control method of its drive motor. There are significant differences between the two in many aspects. The following is a detailed summary of these differences:
| Power frequency screw air compressor | frequency conversion screw air compressor | |
|---|---|---|
| working principle | the star-delta starting mode is adopted, starting with 5-8 times the rated current, which has a great impact on the power grid. | The inverter is used to control the speed of the motor to achieve stepless speed regulation. When starting, the PID regulator inside the frequency converter starts gently, and the impact is small. |
| Starting current | the starting current is large, generally more than 6 times the rated current. | The starting current is small, the maximum is within 1.2 times of the rated current. |
| grid impact | the impact on the power grid is large, and it is easy to cause instability of the power grid. | The impact on the power grid is small, and the start is stable. |
| barometric stability | air pressure stability is relatively poor, because can only work in a fixed displacement. | Good pressure stability, with stepless speed regulation characteristics, can quickly adjust the response, to adapt to large fluctuations in gas occasions. |
| Noise level | the noise is relatively high because the motor is always running at a fixed speed. | Low noise, because most of the working conditions are below the rated speed, reducing mechanical noise and wear. |
| energy consumption efficiency | the energy consumption is higher because the motor speed cannot be adjusted according to actual needs. | Low energy consumption, because the speed can be adjusted according to changes in air demand to achieve a dynamic balance of energy consumption. |
| Scope of application | it is suitable for occasions where the requirements for air pressure stability are not high, such as ordinary construction sites. | It has a wide range of applications and can be used in enterprises and construction sites of various sizes to meet high-demand industries, such as medicine and electronics. |
| Maintenance costs | due to the large starting impact, the maintenance and repair of the equipment may be increased. | The start-up shock is small, which reduces the maintenance and repair of the equipment and reduces the operation and maintenance cost. |
| intelligent control | usually do not have intelligent control function, or intelligent control function is weak. | It is usually equipped with an intelligent control system, which can realize remote monitoring and management and improve management efficiency. |
| energy saving effect | the energy saving effect is relatively poor. | The energy saving effect is remarkable, and the average energy saving can reach 15% or more. |
| Price | generally speaking, the price is lower than the frequency conversion screw air compressor. | The price is relatively high, but in the long run, the overall cost may be lower due to the significant energy saving effect. |
In summary, there are significant differences between the power frequency screw air compressor and the frequency conversion screw air compressor in many aspects. The choice of which type of air compressor needs to be weighed according to the actual use needs and budget. If the construction site needs high pressure stability, low noise, low energy consumption and intelligent control, then the variable frequency screw air compressor may be a better choice. However, if the budget is limited or the requirements for these functions are not high, the power frequency screw air compressor is also a viable option.
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