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Linear motor and maglev transportation technology

Date:2015-07-09    Read:[ ] 次

 Structure and shape of the linear motor can be made according to customer needs a variety of types of flat, cylindrical or disk type, etc., it can not only use AC power, DC power as well as other kinds of pulse power supply to work . Linear motors even within a few seconds the plane several thousand kilograms of helicopter pulled hundreds of kilometers per hour speed, when it runs in a vacuum state, his speed can even reach several thousand kilometers. In the military, people by using it to make a variety of guns, and also tried it cause for missiles, rocket launch; in the industrial field,直线电机还被致用于Linear motors are also induced the production line for the transmission lines, and a variety of transverse or longitudinal movement of some equipment; the linear motor in addition to a high-speed, large thrust characteristics outside also has low-speed, another fine a characteristic, for example, a stepping motor, it can even be done in steps of 1μm accuracy, therefore, the linear motor has been caused by a device for a lot of precision instruments, such as computer head driving device, a camera shutter automatic plotter, medical equipment, aerospace equipment, all kinds of automation equipment and so on. In addition, the linear motor is also used in a wide variety of civilian installations,Such as doors, windows, tables, chairs moving, door locks, electric curtains opening and closing, and so on, especially in the transportation industry, people take advantage of linear motor mechanisms become more than 500km per hour maglev train.

Maglev technology is a non-contact technology, which is available for many applications in rotary and linear motion.
   Its application advantages are:
  1, non-contact applications, without friction, abrasion dropped, noise and long life;

   2, special occasions, such as vacuum, high temperature, low temperature, water vapor, in vivo and other special applications, without prejudice to the original body;
   3, occasions to be controlled, such as location, too fast, vibration control is relatively easy;
   4, has some special occasions: such as memory, learning, the ability to judge the ability to monitor operational status, records, diagnostic capacity;
   5, controllable power distribution applications: such as maglev vehicles, magnetic bearings each position power distribution and control.

  Its future development trend is mainly as follows:

   1, the control on the DSP as the main control Maglev technology has been more applications;
   2, permanent magnet materials, superconducting materials have been further used in maglev technology;
   3, multi-variable control, control theory promoted the development of the maglev technology;
   4, the development of computer popularization, VLSI, development of new materials, the development of space, technical sophistication, diversification and energy saving and so forth requirements for maglev technology.

 Maglev technology by different combinations of the magnets and the conductors are many classification and corresponding application, maglev train is just a specific application of them.

   By a linear motor and maglev technology constitute the main maglev train. Different types of linear motors and magnetic levitation technology constitutes a different type of maglev train.
   Maglev rail vehicle by changing the traditional wheel-rail friction way forward, using magnetically levitated vehicle, the linear motor drive technology, the train on the track float glide on transportation technology development is a major breakthrough, known as the 21st century an ideal means of transport. Maglev train compared to existing conventional trains, its outstanding advantages mainly as follows:

  1, speed up to 500km per hour or more;

   2, safe, non-hazardous overturned or derailed;
   3, pollution, ride comfort, noise and vibration of the wheel-rail contact;
   4, an area of small, elevated and low load-bearing requirements of the track, which occupies less;
   5, strong adaptability to complex terrain, climbing ability, small turning radius;
   6, cost is not high, the overall structure and easy maintenance, energy saving.

Maglev linear motor according to the different types of maglev technology can be divided into two categories:
   1, a normally absorbing leafing
   With a normal conductor coil to the principle of opposite poles attract, usually by a synchronous or asynchronous linear motor driven, such a train, often referred to as a normally floating suction type maglev train in Germany as the main representative. Speed can be designed according to 100km / h or 500km / h. Maglev height is generally 10mm.
   2, the superconducting exclusion leafing
  Low temperature superconducting coil, the same magnetic poles repel principle, generally by synchronous linear motor driven train, often referred to as the superconducting Maglev trains float exclusion. Japan as the main representative. High-speed multi-speed ships, namely 500km / h or more. Maglev height of up to 100mm and above.

   Development direction maglev train can be divided into low, medium and high speed in three ways (Table 1). Development of low-speed maglev reason, one sharp rise in the cost of conventional metro systems; the second is the development of power electronics and control technology. For these two reasons it with the traditional subway has a competitive edge.

 Advantages of maglev train in the world to pay attention to many developed countries, has been put into this research and experimentation are Germany, Japan, the United States, Russia, France, Britain, Canada, South Korea and Switzerland, Sweden, the huge investment in some countries. Germany and Japan are the world's most powerful country in research and development of the maglev train, which many in the country built test lines of Shanghai Pudong line is mainly the introduction of German technology.
 
  Under China from the beginning of the 1980s, the state has invested a small amount of funding in the case of a small number of universities, research institutes to carry out basic research experimental work EMS Maglev train, Southwest Jiaotong University developed the 4 t test vehicle and National Defense Science and developed six t test car has achieved a successful operation. Chinese Academy of Sciences in September 1994 held in Beijing Xiangshan maglev train special meeting, we proposed to vigorously carry out research and development of maglev technology. State Science and soft issues in this area given the support and the inclusion of "95" and "15" major scientific and technological programs. In addition, China and Japan, Germany, Russia and other countries in maglev technology
 
  Exchange system, and from the more. From 1995 to 1996, the Japanese business community and Zhejiang, Shanghai and China's authorities numerous contacts between Shanghai to Hangzhou on the possibility of establishing a commercial operation maglev train line had the talks by the State Science and Technology Commission, Ministry of Railways and the Chinese Academy of Sciences, Zhejiang University, Southwest Jiaotong University, National Defense Science and other components of the "maglev train major technical and economic issues research" soft subjects were studied.In 1997, the State Science and Technology Commission, the Ministry of Railways commissioned by Zhejiang University and Japanese industries jointly held an international symposium in Hangzhou maglev train, Zhejiang University, almost all the world's countries have developed maglev train involved in the meeting. Establishment of the Shanghai maglev line, for our research and development and development of maglev transportation technology provides a good start.