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When we think about an air compressor, one of the major factors involves its energy efficiency. In all industrial applications, an air compressor is one of the most common energy-consuming devices. The estimations are that 10-15% of all energy consumption in the industry comes from air compressors; thus, choosing an energy-efficient air compressor will play a vital role in business.
Now, there are many air compressors with wide applications; among them, the Permanent magnet variable frequency air compressor and traditional screw air compressor are the most popular. Although they have the same purpose they serve, they differ considerably in design and working principles. We will analyze below the energy efficiency performance of permanent magnet variable frequency air compressors and screw air compressors, explaining why permanent magnet variable frequency air compressors are more efficient compared to screw air compressors.
Principles and features of traditional screw air compressor
Screw air compressor is one of the most general and common types of air compressors in industries. It’s based on the n relative movement of two rotating screws to accomplish gas compression. The main and slave screw will be engaged and, while rotating, the gas will be gradually squeezed out for discharge.
Screw air compressors have a wide range of uses in manufacturing, construction, and automotive industries. It is capable of supplying gas pressure and flow rate stably and satisfying various demands in different fields. Comparatively speaking, screw air compressors have a relatively simple structure in mechanics. Therefore, it is relatively easy to conduct maintenance and repairs on them.
However, screw air compressors still have some shortcomings that cannot be ignored. Screw compressors normally operate at a constant speed and power consumption-that is, they cannot be tuned to the demand for gas; thus, they keep on wasting energy by running at full power during low loads or at times of no load. With fixed characteristics of operation, screw compressors are more adapted to applications involving continuous operation with fairly stable loads. The screw compressors can show lower energy efficiency performance for fluctuating gas demand or frequent load changes.
Principle and characteristics of permanent magnet variable frequency air compressor
Permanent magnet variable frequency air compressor is a new generation of advanced air compressors. It adopts an advanced motor design and control system: introducing energy-saving permanent magnet motors into the air compressor. The permanent magnet variable frequency air compressor is efficient, energy-saving, and reliable.
The permanent magnet variable frequency air compressor realizes the use of variable frequency drive technology, which regulates operation speed and power according to gas demand. Controlling the rotational speed of the motor with great accuracy, the permanent magnet variable frequency air compressor could finally achieve on-demand supply and energy-wasting avoidance. Compared to a traditional fixed-speed air compressor, the permanent magnet variable frequency air compressor possesses better energy efficiency. Since the operating speed can be adjusted according to the load demand, it automatically reduces power consumption during low load or shutdown to save energy. In actual operation, permanent magnet variable frequency air compressors are always more than 20% more energy-efficient compared with screw air compressors.
Permanent magnet variable-frequency compressors can save energy effectively through real-time monitoring of the load demand and automatically adjusting the operating speed. This reduces not only the operating cost of enterprises but also the negative impact on the environment. Compared to traditional compressors, permanent magnet variable-frequency compressors are normally much quieter. Noise reduction is an important aspect to improve the comfort and safety of the working environment.
Permanent magnet variable frequency compressors may also make real-time adjustments according to gas demand, providing stable gas pressure and flow in this way. Precise control of the motor thereby improves productivity and meets the particular process demands. They have advanced self-diagnostic functions and fault warning systems that can find and solve potential problems in time, thus reducing downtime and maintenance costs.
Enneng permanent magnet variable frequency motor for air compressor
To save the energy cost of air compressors, now we introduce energy-efficient permanent magnet motors in our inverter models. This can greatly reduce energy consumption, thus saving more energy and money.
Enneng permanent magnet motors are made with a temperature rise of less than 60K to ensure that the compressor will have a longer lifetime. A small-sized motor made from rare earth permanent magnetic material allows operation with a low current, considering that during the start-up and the operation of the motor, the magnetic strength is high together with the load torque. The motor operates in conjunction with a permanent magnet rotor to achieve a soft start and power savings of up to 50 percent. Motor efficiency is 10-15% higher compared to asynchronous motors of the same size. In addition, this avoids the strong mechanical shock to the compressor when the motor is at full-voltage start and guarantees a longer service life.
For professional advice on compressor cases, please contact us. Our engineers are at your service on a case-by-case basis. Enneng permanent magnet motors can replace traditional three-phase asynchronous motors easily and provide you with higher efficiency and intelligence.
Conclusion
Permanent magnet variable frequency air compressor has obvious advantages in energy-saving performance compared with traditional screw air compressors. Using a permanent magnet motor, it has a stronger adjustment capability. The permanent magnet variable frequency air compressor adjusts the operating speed and power output according to the actual demand for load, realizing an on-demand supply. Under application situations that require high energy efficiency and energy saving, the permanent magnet variable frequency air compressor is ideal. It can better meet the actual load demand with its superior energy-saving performance and intelligent control function, improve energy utilization efficiency, and reduce energy waste. Therefore, the promotion and application of permanent magnet variable frequency air compressors are conducive to achieving the goals of energy saving and sustainable development.
