Principle and Application of Inverter Compressor Controller

Release Time:

2022-06-13 09:29

Discussion on the Principle and Application of Variable Frequency Compressor Controller

Previously, we have introduced the concept of "secondary/secondary compression currently on the market" (review of various stamps: the impact of secondary compression unloading power on operating costs) and measured comparison. And the enthusiastic response from the industry. Now, at your request, we will bring you some technical knowledge about the inverter compressor controller and the interpretation of the upcoming new national standard in a similar way. I hope you like it and look forward to discussing with experts in the compressor industry.

So let's start with the principle and application of inverter compressor controller

As we all know, the frequency conversion air compressor on the market is more and more widely used. With the rapid development of permanent magnet frequency conversion technology, the application scope of frequency conversion compressor controller is still expanding. Many people may have the following questions: What is the frequency conversion of the air compressor? How does the air compressor achieve frequency conversion? How does the frequency conversion air compressor save energy? Let's learn about it today.

The significance of air compressor frequency conversion

The so-called frequency conversion is to change the power supply frequency of the motor. Frequency conversion is abbreviated as VSD (short for Variable Speed Drive), which means variable speed drive. There are many benefits that air compressor frequency conversion can bring. It can reduce the starting current of the motor, reduce the impact on the user's power grid, automatically adjust the load to reduce power consumption, reduce loss, and extend the service life of the equipment.

How to realize energy saving by variable frequency air compressor

Most users will consider the production conditions when selecting the installed capacity of the air compressor. However, the actual working conditions can only reach 60%-80% of the gas consumption, or even lower. The traditional constant speed air compressor adopts the loading and unloading control technology. In order to not stop the machine when the gas consumption is not large, the number of start and stop of the motor is reduced by unloading operation. In the unloading state, the motor idling does not produce compressed air, which is called the power consumed at this time. Offloading power is actually a waste of energy. But the air compressor using frequency control is not the same. The variable frequency air compressor will automatically adjust the motor speed according to the actual gas demand of production to realize the air volume adjustment. When the air consumption is reduced, the air compressor will automatically reduce the speed to reduce the power consumption; to achieve a constant match between the air compressor's gas production and the customer's gas demand, no unloading loss, is a major improvement in frequency conversion.

What needs to be reminded here is that the inverter is not energy-saving under all operating conditions. As shown in the figure above, the energy saving effect of the inverter is not so obvious when it is running at or near full load. If the user's gas consumption is stable and basically unchanged, it is more appropriate to choose an efficient fixed-speed air compressor. Of course, this situation is relatively rare. Visible, only selected inverter compressor controller can save energy.