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Linear Motor and Maglev Traffic Technology
- Nov 13, 2017 -

Linear motor is a novel motor, magnetic levitation and linear motor lead to some new technologies, such as maglev train; production of transmission lines.


Linear motor The main linear motor, which is a direct conversion of electrical energy into linear motion mechanical energy, without any intermediate conversion mechanism drive. It is the second half of the 20th century electrician field has a new principle, new theory and new technology, it has a special advantage, has drawn more and more attention.


Linear motor structure can be made into flat, cylindrical or disc type, etc., it can use AC power, DC power or pulsed power supply and other power supply to work. The linear motor can pull a few thousand kilograms of helicopters up to hundreds of kilometers an hour in seconds, running at speeds of up to tens of thousands of kilometers per hour in a vacuum. In the military, people use it to make various kinds of electromagnetic guns, and try to use it for missiles and rocket launches. In the industrial field, linear motors are used to produce conveyor lines and various mechanical devices in horizontal and vertical movements. Linear motors In addition to high-speed, high-thrust characteristics in addition to low-speed, fine another feature, for example, stepper linear motor, which can be step 1μm accuracy, linear motor and has been applied to many precision instruments and equipment, such as computer heads Drive, camera shutter, automatic plotter, medical equipment, aerospace equipment, a variety of automated equipment and so on. In addition, the linear motor is also used in a variety of civil installations, such as doors, windows, tables, chairs, locks, electric curtains, and so on, especially in the transportation industry, people use linear motors Made of maglev train speeding up to 500km.


Maglev technology is a contactless technology that rotates and moves to many applications.

Its application advantages are:

1, non-contact application, no friction, wear, vibration and noise dropped significantly, long life;

2, special occasions, such as vacuum, high temperature, low temperature, water vapor, biological and other special applications, does not damage the original body;

3, the need to control the application of occasions, such as location, speeding, vibration control is relatively easy;

4, with some special occasions applications: such as memory, learning, ability to judge, operating status monitoring, recording, diagnostic capabilities;

5, controllable force distribution applications: such as magnetic levitation, magnetic bearings at each point of the distribution and control of force.

Its future development trends are mainly:

1, control on the DSP as the main control maglev technology to more applications;

2, permanent magnet materials, superconducting materials maglev technology to further application;

3, multivariable control theory to promote the development of maglev technology;

4, the popularity of computer development, VLSI, the development of new materials, the development of space, high technology, diversification and energy-saving environmental protection, etc. Maglev requirements.


Maglev technology, according to different combinations of magnets and conductors, there are many categories and the corresponding application, Maglev train is only one of the specific applications.


By the linear motor and maglev technology constitutes a maglev train body. Different types of linear motors and maglev technology constitute a different type of maglev train.


Maglev train to change the traditional rail vehicles by rail wheel friction propulsion mode, the use of magnetic levitation body, linear motor drive technology, so that the train tracks on the glide, the development of transport technology is a major breakthrough, known as an ideal of the 21st century Transportation. Compared with the existing conventional maglev train, its outstanding advantages mainly as follows:

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

2, safe, no rollover or derailment danger;

3, no pollution, ride comfort, no wheel and rail contact noise and vibration;

4, accounting for small, can be elevated and less demanding on the track load, accounting for less;

5, strong adaptability to complex shape, climbing ability, turning radius is small;

6, the cost is not high, the overall structure easy to repair, energy saving.

Maglev train according to their different types of linear motor and maglev technology can be divided into two categories:

1, often lead floating type

With the general conductor coil to attract the principle of the opposite pole, usually driven by synchronous or asynchronous linear motor, such a maglev train, often referred to as the conventional guided floating maglev train to Germany as the main representative. Speed can be designed for 100km / h or 500km / h. Maglev height is generally 10mm.

2, superconducting floating type

With low-temperature superconducting coils, the principle of repelling the same-sex poles, usually by the synchronous linear motor-driven maglev train, often referred to as superconducting floats floating maglev train. Japan as the main representative. Speed for the general high-speed, that is more than 500km / h. Maglev height up to 100mm or more.


The reasons for the development of low-speed magnetic levitation, one is the sharp rise in the cost of traditional iron systems; the second is the development of power electronics and control technology. These two reasons make it competitive with traditional iron.


The superiority of maglev train has attracted many developed countries in the world, and Germany, Japan, the United States, Russia, France, Britain, Canada, South Korea, Switzerland and Sweden have invested in this research and experiment. Germany and Japan are the strongest countries in the world for researching and developing maglev trains. They have built a number of test lines domestically.

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