The air compressor market has relatively large demand for motors, but air compressors have higher requirements for motors. Today, I will talk to everyone about the special requirements of air compressors for motors.
The comparison of the two designs of equal power and equal displacement and the corresponding working principles can give a glimpse of the "service coefficient" of the screw air compressor. Then we will talk about the screw air compressor and its operation mode.
An air compressor is a manufacturer of compressed air, but compressed air cannot be like water in a river. We can observe its speed and slowness. Compressed air reflects changes in air volume through changes in pipe network pressure. That is to say, pressure change is a reflection of changes in gas supply and demand, pressure change is a phenomenon, and gas volume change is the essence.
For air compressors, the size of the motor load changes periodically. It changes with the user's demand for air volume. When the maximum working pressure set by the user is reached, the air compressor starts to unload, usually a common fixed type The motor power of the screw air compressor after unloading is 30%-45% of the full load power. When the working pressure of the pipe network drops to the lowest working pressure set by the user, the air compressor is automatically loaded, and it is really running at full load (close to Maximum working pressure) is very short.
In our country, the screw air compressor has gradually developed into the main model of the air compressor industry from the early 1990s. Its intelligent control level has been greatly improved with the development of the computer and electronic industries, due to its better intelligent control performance , The operation becomes safer and more stable.
In summary, no matter which design scheme is adopted and its operation mode, for the power selection of the motor, it is the most ideal to make the motor work with the highest efficiency and large power factor. The capacity rating of the motor is some discrete, discontinuous values, and the motor load we determined is between these discrete values.
In the mechanical design manual, the motor power is usually selected by multiplying the shaft power by 1.1 times, and the rated power of the motor is not less than the product of the above two items. Using this method to select the motor power does not have what we call the "service factor", but when applied to the selection of the screw air compressor motor, the consequence is that the efficiency and power factor of the motor are relatively low, resulting in energy and cost waste.
How to make good use of the "service factor" of the motor and control it to operate within a prescribed and reasonable range is a problem that needs to be solved urgently in the screw air compressor industry.
At the same time, the main engine of the twin-screw air compressor has a series of problems caused by the inability to balance the axial and radial forces transmitted to the rotor by the inherent inherent compressed gas. With gearless transmission, it is more or less transmitted to the motor bearings. As a result, some motor bearings often run at high temperatures and are damaged. This is also one of the main reasons why the motor required to drive the twin-screw air compressor is not completely matched with the motor produced by the motor manufacturer. But we believe that the problem will be solved as the main engine manufacturers and motor manufacturers continue to sum up experience and lessons.