How does a maglev train get on-board power?

[ldeane]

Greetings, I'm a physics newbie with a simple (?) question. If it's free-floating, where does the energy come from to power the lights, controls, etc. inside a moving maglev train?

Another related question, if data needs to be transmitted to a moving maglev train, can it be done through conventional wireless communications? I was thinking that a strong magnetic field might interfere with a wireless signal, but then I thought that only charged particles would be deflected by a magnetic field. Can anyone tell me if my thinking is on the right 'track'.

 

[russ_watters]

Induction: a coil under the track near a coil on the train induces a current flow just like in a transformer.

For radio comms, the magnets wouldn't affect it unless the coils generate their own radio signal (of course, if they do, you could modulate that signal to carry data).

Welcome aboard!

 

[ldeane]

Induction: a coil under the track near a coil on the train induces a current flow just like in a transformer.

For radio comms, the magnets wouldn't affect it unless the coils generate their own radio signal (of course, if they do, you could modulate that signal to carry data).

Welcome aboard!

Russ Thanks! and it's great to be here!

 

[MasterPine]

I'm telling you my understandings from Maglev system Transrapid (TR07):
first question: the linear generators intergrated into the support magnets supply power for the train, so no wiring is required.
second question: The magnetic field produced by the train is about 100 µTesla (just double stronger than Earth's magnetic field), therefore its impact on passengers as well as radio comm system is extremely small.

 

[MasterPine]

Hi Russ_watter,
I appreciate your explanation.
The term "windings" is rather vague to me, so could you help me to get the right understanding of it.
Thank so much!

 

[Cliff_J]

An inductor is a coil of wire that can become an electromagnet when electrical current flows through the wire. In effect it stores magnetic energy like a capacitor stores electrical energy.

To increase its magnetic strength, you could pass more electrical current (which creates more heat) or you could make it a bigger coil where the wire is going to wrap around a few more times.

To get the wire in a nice coil, typically a winding machine is used to arrange the wire so it is placed nice and neatly to maximize the amount of wire in a given space (to make it even more effective). Hence the term winding, its the number of times the wire is wrapped around inside the coil. So adding more windings is a way to increase the strength of the magnet (all other things being equal).

Cliff

 

[MasterPine]

Thank you Cliff for your explantion!