Permanent magnet variable frequency air compressor has become a hot spot and bright spot because of its energy saving and high efficiency. The existing large energy consumption air compressor in the market is being replaced or replaced by permanent magnet variable frequency air compressor, which can bring the cost saving of 20%-40% directly to the user.
With the development of science and technology, air compressor, as an important power equipment, is widely used in many industrial fields, such as machinery, metallurgy, building materials, electronic power, chemical industry, food, textile and so on. However, air compressor belongs to high-energy consumption equipment. In some industries, electricity consumption accounts for more than 30% of the electricity consumption, so it is commonly called “electric tiger”.
Why is the opportunity of permanent magnet frequency conversion air pressure to be welcomed by the market? At present, the permanent magnet frequency conversion air compressor has been widely used in industry, and it can not help reminiscent of the power frequency driven air compressor. So, what’s the difference between the two?
1. Pressure stability
As the variable frequency screw compressor uses the stepless speed regulation of the frequency converter, it can be started slowly through the controller or the PID regulator inside the inverter, and the response can be quickly adjusted to the situation where the gas fluctuation is relatively large.
Compared with the upper and lower limit switch control of power frequency operation, the stability of air pressure increases exponentially.
Two, start without shock
Because the inverter itself contains the function of the soft starter, the maximum starting current is within 1.2 times of the rated current, and the startup impact is small compared with the rated current 6 times more than the rated current.
This impact not only impacts the power grid, but also reduces the impact on the whole mechanical system.
Three. Variable flow control
The power frequency driven air compressor can only work in one volume of exhaust, and the variable frequency air compressor can work in a wider range of displacement. The frequency converter adjusts the motor speed in real time according to the actual gas consumption to control the exhaust volume.
When the gas volume is low, the air compressor can be automatically dormant, thus greatly reducing the energy loss.
The optimized control strategy can further improve the energy saving effect.
Four. The voltage adaptability of AC power supply is better
Due to the over modulation technology used by the frequency converter, sufficient torque can still be output when the voltage of AC power is low, driving the motor to work; when the voltage is slightly higher, the output to the motor will not be high.
For self power generation, variable frequency drive can better show its advantages.
According to the characteristics of the motor VF (the frequency conversion air compressor works below the rated voltage in the energy saving state), the effect is obvious for the low power grid voltage field.
Five. Low noise
Most of the working conditions of the inverter system are lower than the rated speed, and the mechanical noise and wear of the main engine will decrease, and the maintenance and service life will be extended.
If the fan is also driven by variable frequency, the noise of the air compressor can be significantly reduced.
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