Difference between permanent magnet frequency conversion and ordinary screw air compressor

Nowadays, permanent magnet variable frequency screw air compressor is gradually replacing ordinary power frequency screw air compressor in the market. Why does this change occur, mainly along with the development of industry, the requirements of consumers on products become higher and higher, which leads to strict checks on the quality of products in the production process and relatively higher requirements on compressed air quality related to the quality of products.High, I would prefer permanent magnet variable frequency screw air compressor for selection. Let me tell you the advantages of permanent magnet variable frequency screw air compressor:

I. Air pressure stability:

1. Because the variable frequency screw air compressor utilizes the stepless speed regulation feature of the frequency converter, it can start smoothly through the controller or PID regulator inside the frequency converter; and it can quickly adjust and respond to the occasion with large fluctuation of air consumption;

2. Compared with upper and lower limit switch control of power frequency operation, air pressure stability is improved exponentially

II. Start-up without impact:

1. Because the frequency converter itself contains the function of soft starter, the starting current can be less than 1.2 times of rated current, and the starting impact is less than 6 times of rated current when compared with power frequency starting.

2. The impact is not only on the power grid, but also on the whole mechanical system, which is greatly reduced.

III. Variable flow control:

1. Air compressor driven by power frequency can only work at one exhaust volume, and variable frequency air compressor can work at a wide range of exhaust volume. Frequency converter adjusts motor speed in real time according to actual air volume used to control exhaust volume.

2. When the air consumption is low, the air compressor can also sleep automatically, which greatly reduces the energy loss.

3. The optimized control strategy can further improve the energy-saving effect.

IV. Voltage adaptability of AC power supply is better:

1. Due to the over-modulation technology used by the frequency converter, sufficient torque can be output when the AC power supply voltage is slightly low to drive the motor to work; if the voltage is slightly high, the voltage output to the motor will not be too high;

2. For the occasion of self-generation, variable frequency drive can show its advantages better.

3. According to the characteristics of VF of electric motor (air compressor with variable frequency operates below rated voltage in energy-saving state), the effect is obvious on the site with low voltage of power grid.