2026-04-14Views：
The difference between power frequency and frequency conversion screw air compressor is mainly reflected in the following aspects:
| Power frequency screw air compressor | frequency conversion screw air compressor | |
|---|---|---|
| working principle | the motor speed is constant, and the displacement is controlled by adjusting the opening of the intake valve. When the gas demand changes, the intake valve opening changes accordingly, but the motor always runs at a fixed frequency. | Using the stepless speed regulation characteristics of the frequency converter, the speed of the motor is adjusted in real time according to the actual gas consumption through the controller or the PID regulator inside the frequency converter, so as to control the displacement. |
| Startup performance | the star-delta starting mode is adopted, and the starting current is large, generally 5-8 times of the rated current, which has obvious impact on the power grid, and frequent start and stop may affect the service life of the equipment. | With soft start function, the starting current is small, the maximum is within 1.2 times of the rated current, which reduces the impact on the power grid and mechanical system and prolongs the service life of the equipment. |
| Energy consumption performance | the motor speed is constant, and the electric energy is still consumed at low load operation, which is similar to that at full load, resulting in energy waste. | The motor speed can be adjusted in real time according to the actual gas consumption, avoiding energy waste. In partial load operation, the energy saving effect is remarkable, and the energy consumption can be saved by more than 30%. |
| barometric stability | due to the intake valve to adjust the amount of gas, resulting in a certain fluctuation in exhaust pressure. | Using the stepless speed regulation characteristics of the frequency converter, combined with the PID regulator, the precise control of the system pressure is realized, and the pressure is stable. |
| Noise level | the motor speed is constant and the noise level is relatively high. | The working conditions of the frequency conversion system are mostly lower than the rated speed, the mechanical noise and wear of the host are reduced, and the noise level is relatively low. |
| Maintenance costs | the motor speed is constant and the parts wear relatively evenly, but the large starting current may cause the aging of the parts to accelerate. | Motor speed varies with gas consumption, component wear is reduced, and due to smoother operation, failure rates and maintenance costs are reduced. |
| Voltage adaptability | it is sensitive to voltage fluctuations, and too high or too low voltage may affect the normal operation of the equipment. | Using over-modulation technology, the adaptability to AC power supply voltage is better. When the voltage is slightly lower, it can still output enough torque to drive the motor to work, and when the voltage is slightly higher, the voltage output to the motor will not be higher. |
| Scope of application | it is suitable for occasions that are sensitive to cost and do not require high air quality, such as some ordinary factory production lines or construction sites. | Suitable for high air quality and stability requirements, such as electronic manufacturing, food processing and other industries. |
To sum up, the power frequency and frequency conversion screw air compressor have their own advantages and disadvantages. In the selection, should be based on their own production conditions, gas demand and budget and other factors to consider, select the appropriate type of equipment.
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