2026-04-09Views：
Water-only machinery and equipment-oil-free air compressor can be divided into permanent magnet frequency conversion and power frequency, which refers to the starting mode of air compressor motor. So what is the difference between the two, and how should users choose?
The permanent magnet variable frequency air compressor can be started smoothly through the PID regulator inside the controller or frequency converter. However, the power frequency variable frequency air compressor is a star-triangle starting mode, which starts with a rapid rated current and has a great impact on the power grid, which is easy to cause instability of the power grid and abnormality.
Many users will have doubts when choosing and do not know how to choose. Usually a single air compressor is recommended to choose the permanent magnet variable frequency air compressor, variable frequency start variable flow control is more energy efficient. When there are more than one, it is recommended to mix and match one power frequency and one frequency conversion, the whole will be more constant and the specific power will be better!
The main differences between permanent magnet frequency conversion screw air compressor and ordinary screw air compressor are as follows:
1. From the perspective of the service life of the machine, the permanent magnet variable frequency screw air compressor is better. Due to the use of inverter drive, the air compressor in the start, the use of "soft start", for the motor has a certain protective effect, reduce the possibility of burning the motor.
2. From the perspective of parts, the permanent magnet variable frequency air compressor adopts high-efficiency rare earth permanent magnet motor and frequency converter. It is of great help to the energy saving of air compressor.
3. From the perspective of maintenance cost, the permanent magnet motor does not need bearings and does not need to add grease, eliminating the point of failure and reducing maintenance costs.
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