Time:12/14/2018 1:28:36 PMauthor:source:
The world's first maglev train demonstration operation line - Shanghai Maglev train, after completion, from Pudong Longyang Road Station to Pudong International Airport, more than 30 kilometers only 6 to 7 minutes.
The Shanghai Maglev train is a “normally-conducting magnetic” (referred to as “normally guided”) maglev train. It is designed by the principle of “sexual attraction”. It is a suction suspension system. The suspension electromagnets mounted on the bogies on both sides of the train and the magnets laid on the rails generate suction under the action of the magnetic field. .
Electromagnets are installed on the top of the train and the top of the bogies. Reaction plates and induction plates are placed above the "work" rails and below the upper arm sections to control the current of the electromagnets to maintain a gap of 1 cm between the electromagnets and the rails. Let the attraction between the bogie and the train balance with the gravity of the train, and use the magnet attraction to lift the train about 1 cm to make the train float on the track. This must precisely control the current of the electromagnet.
The drive of the suspension train is exactly the same as the principle of a synchronous linear motor. In general, alternating current flowing in coils on either side of the track can turn the coil into an electromagnet, which is activated by the interaction of the electromagnets on the train.
The N pole of the electromagnet at the head of the train is attracted by the S pole of the electromagnet mounted on the track at the front point, and at the same time is repelled by the N pole of the electromagnet mounted at a later point on the track. When the train is moving forward, the direction of the current flowing in the coil is reversed, that is, the original S pole becomes the N pole, and the N pole becomes the S pole. The cycle alternates and the train runs forward.
Stability is controlled by the guidance system. The "normally guided magnetic" guiding system is a set of electromagnets dedicated to guiding on the side of the train. When the train is shifted left and right, the guiding electromagnet on the train interacts with the side of the guide rail to generate a repulsive force to return the vehicle to its normal position. When the train is running on a curve or a ramp, the control system controls the current in the guiding magnet to achieve the purpose of control operation.
The concept of the "normally guided" maglev train was proposed by German engineer Hermann Kemper in 1922.
The "normally guided" maglev train and the track and motor work exactly the same way. Just place the "rotor" of the motor on the train and lay the "stator" of the motor on the track. Through the interaction between the "rotor" and the "stator", electrical energy is converted into forward kinetic energy. We know that when the "stator" of the motor is energized, the "rotor" can be rotated by electromagnetic induction. When transmitting electricity to the "stator" of the orbit, the train is driven to move linearly like the "rotor" of the electric motor by electromagnetic induction.
The Shanghai Maglev train has a speed of 430 kilometers per hour. Only one train can be allowed to operate in one power supply zone. There are isolation nets at 25 meters on both sides of the track, and protective equipment on the upper and lower sides. The radius of the turn is 8,000 meters, which is almost a straight line with the naked eye; the smallest radius is also 1300 meters. Passengers will not feel uncomfortable. The most advanced isolation device in the world is installed within 50 meters on both sides of the track. The Shanghai line will eventually extend to Hangzhou. And directly serve the Expo.
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