maglevtrainsppt-150504021928-conversion-gate02
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Uses monorail track with linear motor
Uses magnets to reach a really high velocity
Floats about 1-10cm above the guideway on a magnetic field.
Propelled by the guideway
Once the train is pulled into the next section the magnetism switches so that the train is pulled on again.
There are 2 notable types of maglev technology:-
•Electromagnetic suspension(EMS)
•Electrodynamic suspension(EDS)
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.
Super cooled superconducting magnets under the train. Levitate about 10 cm.
The field in the train due to superconducting magnets(JR-Maglev) or an array of permanent magnets(Inductrack).
The force in the track is created by induced magnetic field in wires or conducting strips in the track.
Naturally stable. Requires no feedback control.
Requires retractable wheels at low speed , max speed – 522km/hr
TECHNOL |
MERITS |
DEMERITS |
OGY |
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EMS |
•Magnetic fields inside & outside the |
•Constant monitoring correction |
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vehicle are less than EDS. |
of separation between vehicle & |
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•No wheels or secondary propulsion |
guideway using computer |
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required |
systems essential. |
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•Can attain very high |
•Due to inherent instability and |
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speed.(500km/hr). |
corrections ,vibration issues may |
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occur. |
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EDS |
•Onboard magnets and large |
•Strong magnetic field makes the |
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separation enable highest recorded |
train inaccessible to passengers |
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speeds(581km/hr) and heavy load |
with pacemakers or storage |
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capacity. |
media like hard drives and credit |
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•Naturally stable and hence no |
cards. |
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feedback control required. |
•Vehicle must be wheeled for |
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low speed travel. |
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TECHNOLOGY |
MERITS |
DEMERITS |
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INDUCTRACK |
•Failsafe suspension-No power |
•Requires wheels |
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required to activate magnets. |
when the vehicle is |
SYSTEM |
•Can generate enough force at |
stopped |
(PERMANENT |
low speeds to levitate the train. |
•New technology , |
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•The train can slow down on its |
still under |
MAGNET EDS) |
own in case of power failures. |
development , no |
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•The array of permanent |
commercial version |
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magnets are cost effective than |
or full scale system |
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electromagnets. |
prototype |
EMS system rely on active electronic stabilisation..
All EDS systems are moving systems.
Since these vehicles fly,stabilisation of pitch , roll and sway is required
In addition to rotation , surge , sway and or heave can be problematic.
Some systems use the use of vac trains-maglev train technology used in evacuated tubes , which removes the air drag.
This increases the speed and efficiency greatly . It is a proposed design for super high-speed transportation about 4000-5000 mph.
But the passengers may suffer from the risk of cabin depressurization in the event of a train malfunction.
Hence require tunnel monitoring system for repressurization
Energy is used to make the Maglev train levitate and to stabilise the movement.
Main part of the energy used to overcome the air drag.
For very short distances the energy for accelerating is considerable.
But the power used to overcome the air drag increases with square of velocity and hence dominates at high speed.