author=poynt99 link=topic=4611.msg110907#msg110907 date=1710891955]
If I understand correctly, I'm not sure I agree that electrons are flung about within a conductor due to centrifugal forces within the spinning disc. Why do you say electron separation is caused by that, vs. being caused by conventional electromagnetic induction?
Because there is no changing magnetic field to cause !standard! induction.
The magnetic field is stationary, regardless of whether the magnet spins with the disk or not. This is why it does not matter if the magnet rotates with the disk, or is stationary when the disk rotates.
This is because the magnetic field around a PM is not fixed to the PM, but more so like a cloud of gas (so to speak) around the PM, and where there are no !magnetic field lines! pinned to the PM it self. In saying that, the magnetic field can exert a force on the PM body itself-as we all know. But if you spin a PM on it's axis, the field will not spin with it.
If it were induction, the copper disk would increase in temperature when spinning without a load placed across it, as it is a shorted turn it self. But as we all know, the copper disk does not heat up when it is spun, when no load is placed across the disk, even though a voltage appears across the disk.
If in the case of my AC model, then the magnet halves must rotate with the disk halves.
If the magnet halves were stationary, and the half disks rotated around the stationary magnets, then !standard! induction would occur, and the half copper disks would indeed get hot without a load placed across them.
With the homopolar generator, which ever part is moving (except the magnet itself) relative to the stationary magnetic field, is what will produce the emf across it.
So if it is the disk that is rotating, and the circuit is stationary, then it is the disk that produces the emf across it. If the disk is stationary, and the circuit is rotating, then it is the circuit that is producing the emf across it, and the disk just becomes a conductor in the circuit.
I have watch for many years people making the same mistake over and over again, and where different people carry out testing, and just confirm the results of those that made the mistakes.
Real science is not about making confirming experiments--it is going about trying to debunk previous findings.
Mistake 1--Take for example the test pictured below.
They (the experimenters) rotate the disk, while the voltage meter remains stationary, and they get a voltage across the meter.
They then rotate the voltage meter with the disk, and they get no voltage.
They then come to the conclusion that it is these magic magnetic field lines cutting through the voltage meters circuit conductors that is creating the emf.
So they just happily confirm others mistakes, and are blind as to why they get these results. This is not science. This is the same mistake being made over and over again.
Why no one can stand back and see this obvious mistake is beyond me.
So in summery-
1- No changing magnetic field, and no generated heat across the shorted turn disk, means no !standard! induction is taking place, regardless of the fact that a voltage still appears across the disk form the center to the outer rim of the disk.
2- Disregarding the magnet, what ever is rotating in the stationary magnetic field, is what produces the emf across it.
If the disk is rotating, and the circuit stationary, then it is the disk that produces the emf.
If the disk is stationary, and the circuit is rotating, then it is the circuit that is producing the emf.
Brad
Never let your schooling get in the way of your education.
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Topic: AC Homopolar Generator Conundrum (Read 5636 times)
