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

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

  • 2021-10-15

With the development of science and technology, as an important power equipment, air compressors are widely used in many industrial fields such as machinery, metallurgy, building materials, electronics and electricity, chemicals, food, textiles and so on. However, air compressors are high-energy-consuming equipment. In some industries, power consumption accounts for more than 30% of production power consumption. Many manufacturers are slowly paying attention to the fact that air compressors are not energy-saving.


What are the differences between a permanent magnet variable frequency screw air compressor and a power frequency screw air compressor:

1. The air pressure is stable

Because the frequency conversion screw air compressor uses the stepless speed regulation characteristics of the frequency converter, it can start smoothly through the controller or the PID regulator inside the frequency converter; it can quickly adjust the response to the occasions where the air consumption fluctuates greatly. Compared with the upper and lower limit switch control of power frequency operation, the air pressure stability is improved exponentially.

2. No impact at startup

Since the frequency converter itself contains the function of a soft starter, the starting current z* is within 1.2 times of the rated current. Compared with the power frequency starting at more than 3 times the rated current, the starting impact is small. This impact is not only on the power grid, but also on the entire mechanical system, which is also greatly reduced.

3. Variable flow control

The air compressor driven by industrial frequency can only work at one displacement, while the frequency conversion air compressor can work at a relatively wide range of displacement. The frequency converter adjusts the motor speed in real time according to the actual air consumption to control the air displacement. When the air consumption is low, the air compressor can be automatically hibernated, which greatly reduces the energy loss. The optimized control strategy can further improve the energy-saving effect.

4. The voltage adaptability of the AC power supply is better

Due to the over-modulation technology adopted by the frequency converter, it can still output enough torque to drive the motor when the AC power supply voltage is slightly lower; when the voltage is higher, it will not cause the output voltage to the motor to be higher. For the occasion of self-generation, the variable frequency drive can show its advantages.

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