Permanent magnet variable frequency air compressor（PMV air compressor) is widely used in industry, which reminds people of the air compressor driven by power frequency(fixed speed air compressor).Throughout the market, power-frequency driven air compressor has gradually withdrawn from people's attention, replaced by the permanent magnet variable frequency air compressor, so what is the difference between the two, why the permanent magnet variable frequency air compressor opportunity to be welcomed by the market?
一、 stable air pressure:
1, because the variable frequency screw air compressor USES the inverter stepless speed regulation characteristics, through the controller or inverter internal PID regulator, can gently start;For the occasion of large fluctuation of gas consumption, and can quickly adjust the response;
2. Compared with the upper and lower limit switch control of power frequency operation, the air pressure stability is improved exponentially.
二、 No impact at startup:
1, because the frequency converter itself contains the function of soft starter, the maximum starting current is within 1.2 times of the rated current, compared with the power frequency starting generally more than 6 times of the rated current, the starting impact is very small.
2. The impact not only on the power grid, but also on the whole mechanical system is greatly reduced.
三、 Variable flow control:
1, power frequency driven air compressor can only work in a volume, variable frequency air compressor can work in a wide range of volume.The frequency converter adjusts the motor speed in real time according to the actual air consumption to control the air discharge.
2, when the gas consumption is low, you can also let the air compressor sleep automatically, so as to greatly reduce the loss of energy.
3. Optimized control strategy can further improve the energy saving effect.
四、 Better voltage adaptability of ac power supply:
1. Due to the over-modulation technology adopted by the frequency converter, sufficient torque can be output to drive the motor to work when the ac power supply voltage is slightly lower;When the voltage is slightly higher, the output voltage to the motor will not be too high;
2, for the occasion of spontaneous electricity, frequency conversion drive can show its advantages;
3, according to the characteristics of the motor VF (variable frequency air compressor in the state of energy saving work under the rated voltage), for the power grid voltage field, the effect is obvious.
5. Low noise:
1, most of the working conditions of the frequency conversion system is lower than the rated speed of the work, the host mechanical noise and wear down, extend the maintenance and service life;
2, if the fan is also driven by frequency conversion, can significantly reduce the noise of air compressor work.
The difference between frequency conversion and power frequency is obvious. The advantage of energy saving and efficiency of permanent magnet frequency conversion air compressor is the necessary means to win the market.