maglev trains! (1 Viewer)

[ridiculous]

are electromagnets used just on the guide rails or are there some on the train as well? how is the train propelled - using electromagnets or superconductors

 

[Forbidden.]

are electromagnets used just on the guide rails or are there some on the train as well? how is the train propelled - using electromagnets or superconductors

There are superconductors on the train itself with electromagnets on the guideway.
The electromagnets creates magnetic fields which are repelled by the superconductors (while below critical temperature using a refrigerant) under the train which will in turn propel the train with almost frictionless movement.

 

[ridiculous]

and is it levitated by superconductors, right? oh, it can be electromagnets too?

 

[James747]

In the case of the maglev train in japan, the train is levitated by the interaction of the superconductor onbaord the train and the electromagnets in the guideway. The train is propelle by changing the polarity of the electromagnets on the guideway so that "push" and "pull" forces are created, propelling the train along.

 

[helper]

Just to clarify. The maglev train doesn't use the meissner effect. There is a permament electromagnet inside the train based on the superconductor. The electromagnets on the tracks tuen on and off to levitate and provide motion to the train.

 

[ridiculous]

thanx for all your help guys

 

[jlnWind]

Just to clarify. The maglev train doesn't use the meissner effect. There is a permament electromagnet inside the train based on the superconductor. The electromagnets on the tracks tuen on and off to levitate and provide motion to the train.

Could anyone please explain this in more detail
I understand that the maglev train doesnt use the meissner effect.
And i also understand that there are two type of maglev trains
EMS, electromagnetic suspension, which uses attractive pulling forces, and electromagnets to allow the train to levitate at all times. These are used in germany.

and the other type (the one im unsure of)
EDS, electrodynamic suspension, uses repelling forces, and it has a superconductor magnet on the train. initially it starts on landing wheels, but id always assumed that as speed increases the currents induced in the superconductors (no resistance) become great enough for the repulsion to occur. But of course this isnt possible since SC expel magnetic fields?

Ahh shit. lol

 

[shredinator]

Just to clarify. The maglev train doesn't use the meissner effect. There is a permament electromagnet inside the train based on the superconductor. The electromagnets on the tracks tuen on and off to levitate and provide motion to the train.

What do you mean by 'permanent electromagnets'? Isn't that a bit of a contradiction?

 

[helper]

What do you mean by 'permanent electromagnets'? Isn't that a bit of a contradiction?

What I meant is like in a MRI machine. The current is set up in the superconductor and left. This means that you don't need a power supply on the train or the ability to turn it on and off.

 

[helper]

EDS, electrodynamic suspension, uses repelling forces, and it has a superconductor magnet on the train. initially it starts on landing wheels, but id always assumed that as speed increases the currents induced in the superconductors (no resistance) become great enough for the repulsion to occur. But of course this isnt possible since SC expel magnetic fields?
l

They aren't inducing currents in the superconductor. The superconductor is there as a large electromagnet. The electromagnets outside the train are used to support and drive the train by producing repulsive and attractive forces between the two electromagnets.