29-06-2010, 06:49 PM
DRIVING WITHOUT WHEELS,
FLYING WITHOUT WINGS
Basic principle:
When two bar magnets are suspended with unlike poles near, Any effort to bring these two magnets into closer faces a force of repulsion which is proportional to the strength of the magnetic field between the two bar magnets. The the effects of gravitation is counteracted by the electromagnetic force.
The MAGLEV thus suspends, guides and propels vehicles via electromagnetic force. They have a lot of advantages like
-They can be supported on lightweight elevated tracks.
-can ascend steeper slopes than conventional trains
As there is no physical contact between the track and vehicle , only the minute friction between the carriages and air matters here. So very high speeds upto 650 KMPH can be attained and also the energy consumption and noise levels are low.
Electrodynamic suspension
In this system , , both the rail and the train exert a magnetic field and the repulsive force levitates the train. No feedback control is required in this case as the forces to repel the magnets automatically adjust their magnitude as the train moves farther and closer to the magnet. They have a major disidvantage that the current induced in the coils and the resultant magnetic flux is not large enough to support the weight of the train.
Linear induction motor (LIM) in magnetic levitation
The High Speed Surface Transport (HSST) is driven by such a motor. The the carriage body houses the primary coils, and the the steel rails and aluminum reaction plates form the track.
full report:
http://www.scribddoc/29410873/maglev
FLYING WITHOUT WINGS
Basic principle:
When two bar magnets are suspended with unlike poles near, Any effort to bring these two magnets into closer faces a force of repulsion which is proportional to the strength of the magnetic field between the two bar magnets. The the effects of gravitation is counteracted by the electromagnetic force.
The MAGLEV thus suspends, guides and propels vehicles via electromagnetic force. They have a lot of advantages like
-They can be supported on lightweight elevated tracks.
-can ascend steeper slopes than conventional trains
As there is no physical contact between the track and vehicle , only the minute friction between the carriages and air matters here. So very high speeds upto 650 KMPH can be attained and also the energy consumption and noise levels are low.
Electrodynamic suspension
In this system , , both the rail and the train exert a magnetic field and the repulsive force levitates the train. No feedback control is required in this case as the forces to repel the magnets automatically adjust their magnitude as the train moves farther and closer to the magnet. They have a major disidvantage that the current induced in the coils and the resultant magnetic flux is not large enough to support the weight of the train.
Linear induction motor (LIM) in magnetic levitation
The High Speed Surface Transport (HSST) is driven by such a motor. The the carriage body houses the primary coils, and the the steel rails and aluminum reaction plates form the track.
full report:
http://www.scribddoc/29410873/maglev