Why permanent magnet variable frequency air compressor will become the future development trend

Why permanent magnet variable frequency air compressor will become the future development trend

Permanent magnet variable frequency air compressors are widely used in industry, and people can't help but remind people of industrial frequency-driven air compressors.

　　 Looking at the market, industrial frequency air compressors have gradually withdrawn from people's attention, replaced by permanent magnet variable frequency screw air compressors. So what is the difference between the two? Why is the permanent magnet variable frequency air compressor popular in the market?

　　 1. The permanent magnet variable frequency air compressor has stable air pressure:

1. Since the permanent magnet variable frequency screw air compressor uses the stepless speed regulation feature of the inverter, it can start smoothly through the controller or the PID regulator inside the inverter; it can also be adjusted quickly in the occasions where the air consumption fluctuates greatly. response;

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

　　 2. Permanent magnet variable frequency air compressor starts without impact:

　　 1. Since the inverter itself contains the function of a soft starter, the maximum starting current is within 1.2 times of the rated current. Compared with the power frequency starting which is generally more than 6 times the rated current, the starting impact is small.

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

　　 3. Variable flow control of permanent magnet variable frequency air compressor:

　　1. The air compressor driven by power frequency can only work at one displacement, and the variable frequency screw 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 exhaust volume.

　　2. When the air consumption is low, the screw air compressor can be automatically hibernated, which greatly reduces the energy loss.

　　3. Optimized control strategy can further improve energy saving effect.

　　 Fourth, the voltage adaptability of the AC power supply of the permanent magnet variable frequency air compressor is better:

　　1. 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 voltage is slightly lower; when the voltage is higher, it will not cause the output voltage to the motor to be higher;

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

　　3. According to the characteristics of the motor VF (variable frequency air compressors work below the rated voltage in an energy-saving state), the effect is obvious for sites with low grid voltage.

　　 5. Permanent magnet variable frequency air compressor has low noise:

　　1. Most of the working conditions of the frequency conversion system work at lower than the rated speed, the main machine's mechanical noise and wear are reduced, and the maintenance and service life are extended;

　　2. If the fan is also driven by frequency conversion, it can significantly reduce the noise of the air compressor.

　　 The difference between frequency conversion and power frequency is obvious. The energy-saving and efficiency advantages of permanent magnet frequency conversion screw air compressors are necessary means to win the market.