2026-04-09Views：
In the air compressor market, the comparison between power frequency and variable frequency screw air compressor has not stopped, so which is better, power frequency or variable frequency screw air compressor?
The main difference between power frequency and variable frequency screw air compressor is that the variable frequency air compressor joins the frequency converter, and the frequency converter is used to control the actual input power to achieve the purpose of energy saving and power saving.
1. start without impact:
the inverter itself contains the function of a soft starter. The maximum starting current is within 1.2 times of the rated current, while the power frequency starting is generally more than 6 times of the rated current, and the starting impact is very small. This impact is not only on the power grid, but also on the entire mechanical system.
Low 2. noise:
most of the working conditions of the frequency conversion system are lower than the rated speed, the main machine mechanical noise and wear are reduced, and the maintenance and service life are extended;
3. pressure stability:
the variable frequency screw air compressor uses the stepless speed regulation characteristics of the frequency converter, and can start smoothly through the controller or the PID regulator inside the frequency converter. For occasions with large fluctuations in gas consumption, it can quickly adjust the response;
4. AC power supply voltage adaptability is better:
1. For self-generating occasions, variable frequency drive can show its advantages;
2. Due to the over-modulation technology adopted by the inverter, sufficient torque can still be output when the AC power supply voltage is slightly lower to drive the motor to work; when the voltage is slightly higher, it will not cause the voltage output to the motor to be on the high side;
3. According to the characteristics of the motor VF (the variable frequency air compressor works below the rated voltage in the energy-saving state), the effect is obvious for the field with low grid voltage.
5. variable flow control:
the frequency converter is based on the actual gas consumption to adjust the motor speed in real time to control the displacement. Therefore, the variable frequency air compressor can work in a relatively wide range of exhaust volume.
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