2026-04-10Views：
The main difference between air compressor power frequency and permanent magnet is reflected in the following aspects:
air pressure stability:
power frequency air compressor: The air pressure stability is relatively poor, because it is controlled by the upper and lower switches.
Permanent magnet variable frequency air compressor: higher pressure stability, mainly rely on the continuous speed control function of the frequency converter, can respond positively according to the stability of the gas.
Impact force at startup:
power frequency air compressor: the impact force is large when starting, because the current is usually 6 times the rated current when starting.
Permanent magnet variable frequency air compressor: Because the inverter has a soft start function, the maximum current at start-up is limited to 1.2 times the set current, which greatly reduces the impact force at start-up.
Control of flow changes:
power frequency air compressor: the displacement is fixed and cannot be adjusted according to the actual gas consumption.
Permanent magnet variable frequency air compressor: the exhaust range is wide, the frequency converter can continuously adjust the motor running speed according to the actual air consumption, so as to control the exhaust volume.
Noise level:
the permanent magnet variable frequency air compressor system usually works in a low-speed environment, and the internal friction of the equipment is relatively low, which helps to extend the service life and reduce noise.
In summary, there are significant differences between the power frequency air compressor and the permanent magnet variable frequency air compressor in terms of air pressure stability, starting impact force, flow change control and noise level. The permanent magnet variable frequency air compressor usually has superior performance in these aspects.
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