Generator's Core

  • Thread starter darkar
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Teoretically and practically, Is there any different in using magnets as core compare to coil as core.
 

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  • #2
Danger
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darkar said:
Teoretically and practically, Is there any different in using magnets as core compare to coil as core.
If I understand your question correctly, yes. A coil has to be in an active circuit to produce magnetism. A generator relies upon the movement of a magnet within a coil to produce current. Therefore an electromagnet won't work unless powered from the outside, which would be kind of silly.
 
  • #3
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Sorry for i let u misunderstood the question.

Well, it is an assignment of my friend. He need to design a domestic animal powered
generator.

This is what he said:

bout the generator, can you tell me the difference between
moving the coil and moving the magnet. Theoretically, it will induce the
same emf, but practically, i remember that there is a difference.

For ur further infomation:

we are using cows to pull a turbine. cuz they can work relatively longer and are strong, even though they are slow, but we can make up for that with stronger magnets and more coils... and then this turbine will be in a magnetic field of a pair of fixed magnets. therefore, electricity, we can assume that there will be a battery charger that will be sufficiently large.

Thanks!
 
  • #4
Danger
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darkar said:
Sorry for i let u misunderstood the question.
Okay, I see. You're asking if it matters which part moves. Not in the sense of creating the electricity, but its far easier from a construction standpoint to move the magnets because they don't have to be electrically connected to anything. If you move the coil, you need slip rings, brushes, etc. to transfer the current from the coil to the rest of the circuit.
I hope that he's using the term 'turbine' to mean a rotary device as opposed to a real turbine which is meant to be turned by a fluid or gas impinging upon it. Since a cow has a lot of horsepower (no pun intended), he should consider gearing the thing way up rather than just adding more magnets and coils to make up for slow rotation. Kick it up to a couple of thousand rpm and watch the sparks fly!
 

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