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

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

With the development of science and technology, air compressors, as an important power equipment, are widely used in many industrial fields such as machinery, metallurgy, building materials, electronics and electricity, chemicals, food, and textiles. However, air compressors are high-energy-consuming equipment. In some industries, power consumption accounts for more than 30% of production power consumption, so they are commonly called "electric tigers".

In recent years, permanent magnet variable frequency air compressors have become a hot spot and highlight in the industry due to their energy-saving and high-efficiency characteristics. The original "electric tiger" on the market, that is, energy-consuming air compressors, is gradually being replaced by permanent magnet variable frequency air compressors. Replacement can directly bring 20%-40% cost savings to users.

　　Why are permanent magnet variable frequency air compressor opportunities welcomed by the market? What is the difference between the two compared with the power frequency driven air compressor?

　　 One, stable air pressure

1. Because the frequency conversion screw air compressor uses the stepless speed regulation characteristics of the frequency converter, it can be started smoothly through the controller or the PID regulator inside the frequency converter; it can also be adjusted quickly for occasions with large fluctuations in air consumption. response.

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

　　 2. Start without shock

　　 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.

　　 Three, variable flow control

　　 1. The power frequency-driven air compressor can only work at one displacement, and the variable frequency 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 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 is better

　　1. Due to the over-modulation technology adopted by the frequency converter, sufficient torque can be output to drive the motor when the AC power supply voltage is slightly low; when the voltage is slightly higher, the voltage output to the motor will not 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. 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 industrial frequency is obvious. The energy-saving and efficiency advantages of permanent magnet frequency conversion air compressors are necessary means to win the market.