Working principle of air compressor frequency converter

The working principle of the inverter acting on the air compressor

the speed of the air compressor motor and the actual power consumption of the air compressor are in a power relationship, so in order to reduce the actual consumption of the air compressor, it is necessary to reduce the motor speed to achieve.

The use of frequency converter in the air compressor system enables the air compressor system to control the motor speed (I .e. output power) in real time without changing the motor torque (I .e. the ability to drag the load) of the air compressor through the precise coordination of electrical control and frequency conversion control, to respond to the change of system pressure by changing the compressor speed, and to maintain a stable system pressure (set value), so as to realize the on-demand output of high-quality pressurized air.

When the system consumption air volume is reduced, the compressed air provided by the compressor is greater than the system consumption at this time, the compressor will reduce the speed and reduce the output compressed air volume; otherwise, increase the motor speed to increase the compressed air volume to maintain a stable system pressure value.

The role of the inverter in its system is the same as that of the fan motor and water pump, which controls the input voltage frequency according to the load change.

Its energy-saving principle and effect are as follows:

1. After using the frequency converter, the pressure setting of the air compressor can be one point, that is, the minimum pressure that meets the requirements of the production equipment can be used as the set pressure. The frequency converter will adjust the speed of the air compressor according to the trend of fluctuation of the pipe network pressure, even eliminating the unloading operation of the air compressor and saving electric energy.

2, because the inverter in the system makes the pipe network up and down pressure stability, can reduce or even eliminate pressure fluctuations, so that all the air compressor in the system are running in a lower pressure to meet the production requirements, reducing the power loss caused by upward pressure fluctuations.

Since the air compressor cannot rule out the possibility of long-term operation under full load, the capacity of the motor can only be determined according to the maximum demand, so the design capacity is generally large. In actual operation, the proportion of light load running time is very high, if the use of frequency control, can greatly improve the efficiency of operation. Therefore, the inverter in the air compressor system has great potential for energy saving.

4. Some adjustment methods (such as adjusting the valve opening and changing the angle of the blade, etc.) cannot reduce the operating power of the motor even when the demand is small. After adopting variable frequency speed regulation, when the demand is small, the speed of the motor can be reduced, and the operating power of the motor can be reduced, so as to further realize energy saving.

Most of the single motor drive systems cannot be continuously adjusted according to the weight of the load. After the frequency conversion speed regulation is adopted, continuous adjustment can be carried out very conveniently, and the pressure, flow, temperature and other parameters can be kept stable, thereby greatly improving the working performance of the compressor.