The difference between power frequency and permanent magnet variable frequency air compressor

The difference between power frequency air compressor and permanent magnet variable frequency air compressor is mainly reflected in the following aspects:

motor type and efficiency:

the power frequency air compressor usually uses a squirrel cage motor, and there will be 7%-15% loss in the process of converting electrical energy into kinetic energy.

The permanent magnet variable frequency air compressor adopts a new type of permanent magnet motor, which has less loss when converting electrical energy and can convert electrical energy into mechanical energy more efficiently, thereby saving energy.

Control mode:

the power frequency air compressor is controlled by the upper and lower switches, and the stability of the air pressure is relatively poor.

The permanent magnet variable frequency air compressor is controlled by the frequency converter, and the motor running speed can be continuously adjusted according to the actual gas consumption, so as to achieve more stable air pressure control and higher response speed.

Starting current and impact force:

when the power frequency air compressor starts, the current is larger, usually 6 times the rated current, which causes a greater impact on the power grid and equipment.

The permanent magnet variable frequency air compressor adopts soft start mode, and the maximum starting current is within 1.2 times of the set current, which reduces the impact on the power grid and equipment.

Energy consumption and energy saving:

during the operation of the power frequency air compressor, the motor efficiency decreases obviously when the load rate is low, and the power consumption increases by 6%-8% for every 1KG of operating pressure.

Through advanced frequency conversion control technology, the permanent magnet frequency conversion air compressor can automatically adjust the speed according to the workload to ensure efficient and stable operation, thereby significantly reducing energy consumption. According to statistics, the use of permanent magnet variable frequency air compressor can save up to 50% of electricity costs.

Displacement and adaptability:

the displacement of the power frequency air compressor is fixed and cannot be adjusted according to the actual gas consumption.

The exhaust range of the permanent magnet variable frequency air compressor is relatively wide, and the exhaust volume can be adjusted according to the actual air consumption. When the air consumption is reduced, the air compressor can automatically rest, further reducing energy consumption.

Service life and maintenance:

the internal friction of the power frequency air compressor is large during operation, which may affect the service life of the equipment.

The permanent magnet variable frequency air compressor usually works in a low-speed environment, and the internal friction of the equipment is low, thereby prolonging the service life. In addition, the service life of permanent magnet motors is usually much longer than that of ordinary asynchronous motors.

In summary, there are significant differences between power frequency air compressors and permanent magnet variable frequency air compressors in terms of motor type and efficiency, control mode, starting current and impact force, energy consumption and energy saving, displacement and adaptability, and service life and maintenance. Permanent magnet variable frequency air compressor has been widely used in modern industry because of its high efficiency, energy saving and stability.