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# Maglev

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Magnetic levitation
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# Maglev

Maglev (derived from magnetic levitation) is a transport method that uses magnetic levitation to move vehicles without touching the ground. With maglev, a vehicle travels along a guideway using magnets to create both lift and propulsion, thereby reducing friction and allowing higher speeds.Maglev trains move more smoothly and more quietly than
wheeled mass transit systems. They are relatively unaffected by
weather. The power needed for levitation is typically not a large percentage of its overall energy consumption;most goes to overcome air resistance (drag), as with other highspeed transport. Maglev trains hold the speed record for rail transportation

Maglev (derived from magnetic levitation) is a transport method that uses magnetic levitation to move vehicles without touching the ground. With maglev, a vehicle travels along a guideway using magnets to create both lift and propulsion, thereby reducing friction and allowing higher speeds.Maglev trains move more smoothly and more quietly than
wheeled mass transit systems. They are relatively unaffected by
weather. The power needed for levitation is typically not a large percentage of its overall energy consumption;most goes to overcome air resistance (drag), as with other highspeed transport. Maglev trains hold the speed record for rail transportation

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## Weitere Verwandte Inhalte

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### Maglev

1. 1. A SEMINAR ON MAGLEV Presented by Subhra ch. behera (1421005) Debasish mohapatra(1421006) 1
2. 2. AGENDA  INTRODUCTION  WHAT IS MAGLEV TRAIN  WHY MAGLEV TRAIN??  HISTORY  TYPES OF MAGNETIC LEVITATION  Types of technology involved  Working principle  Future scopes  conclusion 2
3. 3. INTRODUCTion  Maglev = magnetic +levitation. • It is a method by which an object is suspended with no support other than magnetic fields. • Magnetic force is used to counteract the effects of the gravitational and any other accelerations. (A cubical magnet levitating over a superconducting material) 3
4. 4. WHAT IS MAGLEV TRAIN ??  Magnetic Levitation Train (Maglev Train) is an advanced train technology in which magnetic forces lift, propel, and guide a vehicle over a guide way.  It employs powerful superconducting magnets to levitate or "float“ cars about 2 inches above a guideway.  Liquid helium cools the magnets to near absolute zero enabling relatively small magnets to create very powerful fields. 4
5. 5. Why maglev train??? MagLev Trains Conventional Trains No Friction = Less Maintenance Routine Maintenance Needed No Engine = No fuel required Engine requires fossil fuels Speeds in excess of 300 mph Speeds up to 110 mph 5
6. 6. HISTORY  1900 - Robert Goddard and Emile Bachelet conceived the concept of frictionless trains.  1969 - American scientists James R. Powell and Gordan T. Danby patented the first design for magnetic levitational trains.  1970 - Germans and Japanese start research and development towards their versions of maglev technology  1991 - Germany's government certifies operation of first maglev train for the public.  Finally accomplishing practical public service in 2003 in Shanghai, China 6
7. 7. Basic of Magnetic Levitation  Faraday’s Law :-  1st Law :- It states that whenever a conductor cuts magnetic flux , an emf is induced in that conductor.  2nd Law :- It states that the magnitude of the induced emf is equal to the rate of change of flux-linkage. i.e. , e=-Nⅆφ volts dt  Lenz’s Law :-  It states that , the direction of the induced current is such that the induced magnetic field opposes the change in the flux. 7
8. 8. Lenz’s law 8
9. 9. Types of Magnetic Levitation Permanent Magnet Electro Magnet Superconducting Magnet 9
10. 10. Permanent Magnet The first type of levitation is the implementation through permanent magnets. These magnets are made of a material that creates a north and a south pole on them. The main disadvantages of a permanent magnet are the cost of the magnet itself when put into large scale systems.Another disadvantage is the varying changes in the magnetic field. 10
11. 11. Electro Magnet By running electric current through a wire, we can create a magnetic field. When this wire is coiled around a magnetic material (i.e. metal), a current is passed through this wire, then the electric current will magnetize the metallic core. 11
12. 12. Superconducting Magnet  The superconducting magnets is a material which presents no electrical resistivity to electrical current.  Once a current has been fed into the coils of this material, it will indefinitely flow without requiring the input of any additional current I2R loss = 0 12
13. 13. Types of Technology Electro Magnetic Suspension Electro Dynamic Suspension Induced Track System 13
14. 14. ELECTRO MAGNETIC SUSPENSION The attractive force of magnet are utilised in EMS 14
15. 15. Electro Dynamic Suspension The repulsive forces of magnets are utilised in EDS 15
16. 16. Induced track system Operates on the basis of principle of lenzs law Can attain levitation at comparatively low speed of about 22 mph 16
17. 17. Working Principle of Maglev Train  Principle of Levitation  Principle of Lateral Guidance  Principle of Propulsion 17
18. 18. Levitation  It pushes the train upward so that it can levitate 10 cm above the track. The train does not levitate until it reaches 80 km/h , so it is equipped with wheels. 18
19. 19. Lateral Guidance Use null current system Works on the basis of lenz’s law
20. 20. Propulsion When a current is supplied to the windings, it creates a traveling alternating current that propels the train forward by pushing and pulling. When the alternating current is reversed, the train brakes 20
21. 21. 21
22. 22. Advantages Limitation uses 30% less energy than high speed train Longer lifetime with low maintenance costs  Energy efficiency  No pollution  Environmental benefits  Safety advantages Requires complex circuitry. Requires highly skilled and trained operators. Requires more research. 22
23. 23. FUTURE SCOPES MACH-3 Maglev space propulsion Electric generators- made with superconducting wire: They have a 99% efficiency and have about half the size of conventional generators MagLev Trains in INDIA 23
24. 24. conclusion Maglev trains use magnets to levitate and propel the trains forward.  Since there is no friction these trains can reach high speeds.  It is a safe and efficient way to travel. 24
25. 25. References  E. Riches, “Will Maglev lift off?,” IEEE Review, pp. 427–430, Dec. 1988 • www.wikipedia.org/wiki/Magnetic_levitation • Maglev Trains (Thompson, Marc T. Eddy current magnetic levitation, models and experiments). • S. Yamamura, “Magnetic levitation technology of tracked vehicles present status and prospects,” IEEE Trans. Magn., vol. MAG-12, no.6, pp. 874–878, Nov. 1976  P. Sinha, “Design of a magnetically levitated vehicle,” IEEE Trans. Magn., vol. MAG-20, no. 5, pp. 1672–1674, Sep. 1984 25
26. 26. THANK YOU 26