How does this train work? (vid)

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SUMMARY

This discussion centers on the mechanics of a linear motor train model, specifically utilizing magnets and copper coils. Participants explain that the system operates by creating an induced magnetic field through a copper coil, which interacts with the magnetic field of the magnets to propel the train forward. Key components include a battery, conductive metal-coated magnets, and bare copper wire for the solenoid. The conversation highlights the importance of ensuring that coil turns do not touch to prevent short circuits.

PREREQUISITES
  • Understanding of linear motors and their applications
  • Knowledge of electromagnetic principles, specifically induced magnetic fields
  • Familiarity with electrical components such as batteries and coils
  • Basic physics concepts related to motion and propulsion
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  • Study the effects of electromagnetic induction in coils
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Students working on physics projects, hobbyists interested in model trains, educators teaching electromagnetic concepts, and engineers exploring linear motor technology.

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Can someone briefly describe to me how this works? I am making my own for a physics project and have to do a report with it. What is this an application of / What should I go over in the report, I originally found this when doing a project on Maglev trains but i don't know if it is a similar concept.

Thanks.
 
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I saw a thread on that same thing on here within the last couple of months approx.

did some quick searches .. couldn't find what I was after ... some one else may remember the thread
 
Last edited:
Daniel0099 said:
Can someone briefly describe to me how this works?

Yes, e.g. with a moving magnet under the table.
 
DrStupid said:
Yes, e.g. with a moving magnet under the table.
Is it your contention that this is a trick?
 
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DaveC426913 said:
Is it your contention that this is a trick?

Agree with you Dave

It is a valid video ... I still cannot find the other thread :(
 
Tentative attempt at rudimentary explanation I wouldn't vouch for with my head:

Magnets are typically coated in conductive metal, like nickel, for extended durability. Even if themselves not conductive, their metallic coating will conduct electricity from the battery to the copper coil. The current will flow between + an - through the coil, creating a magnetic field in the process:
electricity-navy-basics-97.jpg

The induced magnetic field will interact with the field of the magnets, propelling the "train" forward.
 
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The dup was deleted, with my explanation. The magnets act as conducting contacts with the bare wire coil. The very clever gadget is a linear motor.
 
The solenoid needs to be bare copper wire, not enamelled, so as the magnets rub along the copper some current flows through that short section of the coil. The ingenuity of some people knows no bounds. :)

Make sure the turns are not each touching, or the current will short out and not go the full distance around each turn. I expect the solenoid after winding will expand a bit, like a spring, so shorted turns should not be a problem.
 
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DaveC426913 said:
Is it your contention that this is a trick?

Yes. The circle would be a Perpetuum mobile.
 
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DrStupid said:
Yes. The circle would be a Perpetuum mobile.
It would not, it is propelled by the energy stored in the battery. When the battery is discharged, it will not work any more.
 
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  • #11
Orodruin said:
it is propelled by the energy stored in the battery

That sounds reasonable.
 

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