Development history of the hottest linear motor

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The history of linear motor can be traced back to 1840 when Wheatstone first proposed and produced a slightly embryonic but unsuccessful linear motor. Since then, it has been more than 160 years. In this not short historical process, linear motor has experienced exploration and experiment There are three times of development, application and practical commercialization:

the period from 1840 to 1955 is the exploration and experiment period:

during the 116 years from 1840 to 1955, the linear motor experienced a process of continuous exploration and repeated failures from imagination to experiment to some experimental applications. Since wheatsone proposed and trial produced the linear motor, the mayor of Pittsburgh in the United States in 1890 was the first to explicitly mention the linear motor article. In an article he wrote, he first clearly mentioned that if the future paper demand is still stable, the linear motor and its patents will be improved. However, due to the level of manufacturing technology, engineering materials and control technology at that time, it failed to succeed after more than 20 years of dogged efforts

from 1905 to 1905, two people proposed to use linear motors as the propulsion mechanism of trains. One proposal was to put the primary on the track, and the other proposal was to put the primary on the bottom of the vehicle. These suggestions were undoubtedly a stimulant for researchers in the field of Linear Motor Research at that time, so that researchers in many countries have invested in these research work. In 1917, the first cylindrical linear motor appeared. In fact, it was a DC reluctance motor with exchanged primary coils. People tried to use it as a missile launcher, but its development did not exceed the model stage

so far, from 1930 to 1940, the linear motor entered the experimental research stage. During this stage, researchers obtained a large number of experimental data, thus having a deeper understanding of the existing theory and laying the foundation for the application of linear motor in the future

From 1940 to 1955, researchers from some developed countries in the world carried out some experimental applications on the basis of experiments. In 1945, Westinghouse Electric Company of the United States first developed the electric traction aircraft catapult, which was powered by a 7400kw linear motor. It successfully accelerated a 4535kg jet aircraft from a static speed of 188km/h within a 165m stroke in 4.1s. Its successful test made the advantages of good reliability of the linear motor deserve due attention. Then, the United States made use of the linear motor for pumping potassium Electromagnetic pumps of liquid metals such as sodium are for the needs of nuclear power. In 1954, the Royal aircraft manufacturing company of Britain made a missile launching device using a bilateral flat DC linear motor, with a speed of 1600km/h. In this stage, it is particularly worth mentioning that the linear motor as the driving device of high-speed train has been highly valued by all countries and is planned to be implemented

in 18mastertop 1327 ⑵ 0dB is an ideal solution to provide beauty, walking comfort and the environment with the lowest noise level. From 40 to 1955, it is the period of linear motor exploration experiment and some experimental applications. In the competition between linear motor and rotating motor, because the cost and efficiency of linear motor can't beat rotating motor, or linear motor hasn't found the field where it can solve the problem alone, And linear motor has no breakthrough success in design, so linear motor has not been really applied in this period

1956 ~ 1970 is the development and application period:

since 195, the linear motor has entered a comprehensive development stage, especially the amazing development of control technology and materials in this period, which has further contributed to this momentum. During this period, the number of patents applied for linear machines also began to increase rapidly. During this period, the growth rate of linear motor patents exceeded the average growth rate of all other technical fields

after 1965, with the significant improvement of control technology and material performance, practical equipment using linear motor was gradually developed, such as MHD pump using linear motor, automatic plotter, magnetic head positioning drive device, phonograph, sewing machine, air compressor, conveying device, etc

from 1971 to now, it is a period of practical goods:

from 1971 to the current stage, linear motors have finally entered an independent application era. In the following information, Jinan experimental machine factory specializes in introducing an era for you. The application of various linear motors has been rapidly promoted, and many devices and products with practical value have been made, such as steel pipe conveyors driven by linear motors, coal conveyors, cranes Air compressor, punching machine, stretching machine, all kinds of electric doors, electric windows, electric textile machines, etc. What is particularly gratifying is that the speed of the maglev train driven by linear motor has exceeded 500km/h, which is close to the flight speed of aviation, and the cumulative test journey has reached hundreds of thousands of kilometers

at present, linear motors are widely used in various fields:

1 The application of linear motor in transportation and civil use

magnetic levitation train has changed the way that traditional rail vehicles are propelled by wheel rail friction. It uses magnetic levitation vehicle body and linear motor drive technology to make the train float and slide on the track. It is a major breakthrough in the history of transportation technology development, and is known as an ideal means of transportation in the 21st century. Compared with existing conventional vehicles, magnetic levitation vehicle, The main advantages are: fast speed (500km/h), safety, no rollover, no noise and vibration, small land occupation, strong slope climbing, simple structure and energy saving. Many countries at home and abroad, such as Germany, Japan, the United States, France, the United Kingdom, Russia, Canada, South Korea, Switzerland, Sweden and China, have invested in this research, especially Germany and Japan, with the largest investment and the longest duration. At present, in addition to the maglev trains in Shanghai, Beijing, Sichuan and other places are also carrying out this work

the application of linear motor in transportation, in addition to magnetic levitation train, is also applied to the drive of electromagnetic propulsion ship. It will be as superior to general propeller propulsion ships as jet aircraft is superior to propeller aircraft. The United States will apply it to military ships, while Japan completed the world's first manned superconducting linear electromagnetic propulsion ship "yamato-1" in June, 1992, and officially completed its trial voyage in Kobe port, Japan. In addition, in terms of transportation applications, linear motors are also used to drive subway cars and highway cars

linear motors have developed rapidly in civil use, with mature products and wide applications. At present, it has been applied to doors driven by linear motors, windows and curtains driven by linear motors, beds, cabinets, tables and chairs driven by linear motors, washing machines driven by disk linear motors, linear motor compressors for air conditioners and refrigerators, household knitting machines and sewing machines driven by linear motors, tea frying machines, etc. Especially the elevator driven by linear motor, which has the advantages of simple structure, material saving, space saving, high speed, low noise, energy saving and so on, has attracted great attention in the elevator industry. Some famous elevator companies around the world are constantly entering the hall in various ways, and a small number of products have come out. For example, Panasonic Otis, a joint venture between Panasonic of Japan and Otis of the United States, has produced thousands of linear motor elevators. In April, 1990, the first elevator driven by linear motor was installed in the Wanshi building in Tokyo, Japan. Mitsubishi Corporation of Japan has also developed a linear motor elevator, which has been exhibited abroad. Hitachi and Fuji are also developing such products. Fuji, Fujitec, Kawasaki heavy industry, Ishikawa Shimo and Shimizu construction first launched a linear synchronous motor transportation system that can operate on vertical, horizontal, curved lines and branch lines at the same time. Zhejiang University in China has also developed a 10m linear motor elevator prototype that can simulate the operation of three floors

2. The application of linear motor in military and other aspects

linear motor has also been used in military, such as the submarine driven by linear motor and the electromagnetic gun driven by linear motor, which was announced by the United States in 1995. In addition, in some military facilities, such as military shooting ranges, military simulation systems, military combat weapons and missile launches, and so on

the development of linear motor technology has experienced a long history and ups and downs, and finally chose a unique idea suitable for the development of linear motor itself. It no longer directly confronts with rotating motor and does not compete with rotating motor in the form of a single machine, but compares the linear motor system with rotating motor system, so as to find a suitable system to compete with rotating motor, Find your position where the rotating motor can't do anything. Compared with non-linear motor drive, the new device driven by linear motor has obvious advantages such as simple structure, no contact, no wear, low noise, fast speed, high precision, flexible combination, etc. However, due to the side effect caused by the magnetic circuit disconnection of linear motor itself and the large installation air gap, in some linear motion devices or systems, whether to use new linear motor to drive, We should weigh the pros and cons, choose linear motion devices or systems that can give full play to the advantages of linear motors. Today, with the rapid development of science and technology, where some rotating motors or other driving devices can't do or barely cope, we should find a position where linear motors can give full play to their advantages, and seek their own development in the process of meeting human needs and improving human good wishes. The prospect is broad, But the choice should be cautious

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