What Is Electromagnetic Power?

Electromagnetic power refers to the power consumed by the power source to overcome the back-EMF, which is converted into mechanical energy by the magnetic field and acts on the rotor in the form of electromagnetic torque. Permanent magnet synchronous generators have begun to be used in aerospace, textile machinery, CNC machine tools, and compressors due to a series of advantages such as simple structure, small size, light weight, strong electromagnetic resistance, small voltage regulation, and high reliability. In the military and civilian fields that require independent power supply systems, such as automobiles and automobiles, in order to maximize the efficiency of these devices and reduce costs, the volume and weight of generators are very demanding, and motors must be small and light.

Permanent magnet synchronous generators have begun to be used in aerospace, textile machinery, CNC machine tools, and compressors due to a series of advantages such as simple structure, small size, light weight, strong electromagnetic resistance, small voltage regulation, and high reliability. In the military and civilian fields that require independent power supply systems, such as automobiles and automobiles, in order to maximize the efficiency of these devices and reduce costs, the volume and weight of generators are very demanding, and motors must be small and light. Therefore, when selecting the type of generator, a series of design criteria unique to this type of generator must be considered, such as ultimate power, overload capacity, mechanical strength, specific weight, inertia, efficiency, reliability, cost, etc., among which the generator is selected One of the most important criteria of a type is to determine its limit electromagnetic power, that is, the maximum power that can be obtained from this type of generator under specified technical conditions.

The enhancement of China's national economy and comprehensive strength has led to the rapid development of China's power industry, the continuous increase in power system capacity, the successive commissioning of large units and the formation of ultra-high-voltage transmission networks. . As one of the most important components in the power system, the safe and stable operation of the generator affects the entire power system. The generator power angle is not only an important parameter reflecting the internal energy conversion of the generator. Its change will cause a change in power, but also a change in no power. The introduction of the power angle will provide a very important reference for the accident analysis of generators under abnormal, fault and out-of-step conditions. Because once the generator runs abnormally, the power angle of the generator will definitely change, and the electromagnetic power output by the generator will change accordingly, which directly affects the reliability of the power supply. Therefore, the generator power angle is a very important monitoring quantity in the power system ^[1]

(1) Forced excitation;

(2) Electrical braking;

(3) The neutral point of the transformer is grounded through a small resistance.

In more than a century, although the development of screw air compressors has made great progress, the quality of its mechanical performance is affected by many factors. Throughout its development process, the performance of screw air compressors is expected to be as follows: Improved on the basis of progress.

In terms of theoretical research

The gas flow in the pipes and cavities of the air compressor is very complicated, and it is difficult to study with a unified model. Therefore, the introduction of emerging technologies such as computer-aided design and analysis and finite element methods into the development of air compressors is expected to break through. The traditional theoretical research has achieved further results, and has continuously promoted the development of air compressor research towards automation and high efficiency.

2. The progress of water (oil) gas separation technology is an important technical indicator to improve the working performance of air compressors

Although some emerging materials have been applied to the manufacture of separator elements and achieved good separation results, with the development of materials science and mechanical processing technology, there may be greater breakthroughs.

3. Anti-corrosion of parts in contact with water in the air compressor is one of the key technologies affecting the performance and life of the air compressor

The use of anti-corrosive materials as the processing materials of parts or covering the base metal of parts to solve the corrosion problem has certain effects. In the future, research on high corrosion resistance and wear resistance engineering materials should be further strengthened. Extend the life and overall performance of the air compressor.

Research and develop high-precision air compressor special processing machine tools, special tools, and advanced testing methods to improve the manufacturing and research and development of air compressors.

In order to detect the frequency bands commonly used in wireless communications as much as possible, including DTV, GSM900, GSM1800, 3G, 4G and Wi-Fi frequency bands, an ultra-wideband electromagnetic power spectrum detector that covers 2002800MHz has been designed.

Hardware design

Ultra-wideband electromagnetic power spectrum detector is composed of antenna, broadband power detection module, computer and detection application software. It includes: power supply module, power acquisition processing module, main controller module and data processing and isolation module. The power module converts the input 220V AC power into a 5V power supply voltage. The power acquisition processing module samples the signals detected by the antenna, and outputs the frequency and power data in pulses. The main control module converts the pulse signal into a data signal, and counts the power consumption of the load in the circuit, and then sends the data signal through the serial port, and the data is displayed on the computer interface.

Because a single antenna cannot meet the requirements of the detection frequency range, a logarithmic periodic antenna (the detection frequency range is 200-1000MHz) and a spine horn antenna (the detection frequency range is 1-18GHz) are used in the test.

2. Software Design

The software design of the main controller module is mainly composed of data acquisition, data processing and serial communication. First, the software interface and the computer display module are designed according to the goals to be achieved by the system, and then the functional subroutines and main programs are written. Then the virtual serial port is used to implement data communication and data display on the computer.

The ultra-wideband electromagnetic power spectrum detector is a complete set of systems, which is convenient to carry. It has the characteristics of wide working frequency band, high test sensitivity, low production cost, simple structure and high stability. However, domestic related inspections generally do not have complete test equipment and build systems. More complicated and tedious ^[2] .