Magnetic levitation trai ns
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Transcript of Magnetic levitation trai ns
MAGNETIC LEVITATION TRAINs
CONTENTS
INTRODUCTION
TYPES OF MAGLEV TECHNOLOGY
BASIC STRUCTURE
COMPARISON WITH COMMERCIAL TRAINS
ADVANTAGES
CONCLUSION
INTRODUCTIONMaglev is a system of transportation that suspends, guides and
propels vehicles, predominantly trains, using magnetic levitation from a very large number of magnets for lift and propulsion.
The highest recorded speed is 581 km/h achieved in Japan in
2003.
TYPES OF MAGLEV TECHNOLOGY
There are 2 notable types of maglev technology:-
• Electromagnetic suspension(EMS)• Electrodynamic suspension(EDS)• Induct rack
ELECTROMAGNETIC SUSPENSION
Electromagnets attached to the
train Has ferromagnetic stators on the
track and levitate the train. Has guidance magnets on the
sides A computer changes the amount
of current to keep the train 1 cm
from the track. Max speed - 438km/hr Has on-board battery power
supply.
ELECTRODYNAMIC SUSPENSION
The first major difference between EDS and EMS is the type of track.
EDS uses superconducting magnets (SCM) located on the bottom of the train to levitate it off of the track.
The repulsive forces between the magnets and coils lift the train, on average, about 4 to 6 inches above the track,
Requires retractable wheels at low speed , max speed – 522km/hr
A NEW TRACK IN THE RUNNING (INDUCTRACK)
This system uses an “arrangement of powerful permanent magnets, known as a Halbach array, to create the levitating force”.
MODEL OF THE INDUCTRACK
BASIC STRUCTURE
Maglev Consist of Three parts1)Levitation2)Guidance3)Propulsion
LEVITATIONIn EDS , levitation coils levitate the train 10cm above the
track. Levitates when speed reaches 100km/hr
In EMS , stator & support magnet levitate the train 1cm above the track. Levitates even when train is not moving.
GUIDANCESome systems use Null Current systemIn EDS when the vehicle is in straight line , no current flows
When it moves off the line this creates changing flux, generating a field that pushes and pulls it back to the line.
Some systems use coils that try to remain in the null flux point between repulsive magnets and reduces eddy current losses.
PROPULSIONEMS systems provide levitation & propulsion using onboard
linear motor. EDS system and Train rapid systems levitate using onboard
magnets & use propulsion coils for propulsion .Cost of propulsion coils increase over long distances.
COMPARISION WITH COMMERCIAL TRAINS
Maglev trains produce less noise than a conventional train at
equivalent speeds.
Maglev is atmosphere friendly not produce toxic Smoke
Relatively very high speed than Commercial trains.
No resistance between the rail and Track so very high speed is
attainable, that's why some times Maglev is compared with
aeroplanes.
ADVANTAGES
Elimination of wheel and track wear providing consequent
reduction in maintenance cost.
The absence of wheels removes much noise and vibration.
It needs less power supply.
It is more safety.
It is fire resistance.
CONCLUSIONMaglev will have a positive impact on sustainability. Using
superconducting magnets instead of fossil fuels, it will not emit greenhouse gases into the atmosphere.
Maglev will contribute more to our society and our planet than it takes away. Considering everything Maglev has to offer, the transportation of our future is on very capable tracks.
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