Quote from: lumen on May 11, 2009, 11:03:45 PM
That cannot be true, the field in the homopolar generator is of constant magnitude and outputs DC current.

I am sure the source of operation is just as I said! When a magnet spins on it's axis the magnetic field rotates with it. This accounts for the operation and non operation of every configuration of the homopolar generator.

I think my statement is true for induction. In inductioon, the generated power is the first derivative of the field strength. That is to say it is proportional to the flux change. That is why transformers can only pass AC and will block DC. You can pass large DC current through a trafo primary and the secondary will be dead.

Think about it, every atom in the metal disk of a homopolar genny will experience constant flux regardless of whether the disk is spinning or not. Also even the static takeoff brushes will always experience constant flux.

Now I might be in partial agreement to you with the whole notion of a spinning field. This could be some kind of aether dragging effect. But Scotty1 says he has performed an experiment where a spinning axial disc mag is brought close to a stationary mag, one would think this aether dragging would cause some rotation of the static mag, but it appears not to?

Make no mistake these homopolar gennies are weird things and I think we owe it to ourselves to get to the bottom of it through real experiments followed by theorising.

Quote from: broli on May 12, 2009, 06:49:25 AM
Gb, the reason a hp motor produces high current is due to the very low resistance. The whole disk is a very good conductor with very little resistance.

I agree with you, but would like to expand on this.

The electrons that cut perpendicularly through the lines of force will encounter more resistance than cutting through the lines of force in a more parallel direction.

If this isn't correct, then please correct me.  Because this is how I currently understand it.

Thanks,

GB

Quote from: scotty1 on May 12, 2009, 07:02:51 AM
When the copper disc and the magnet all spin....then the copper is cutting the flux because it is stationary!!!

The more experiments I do the less I agree with the atomic domain theory...if that were true then the field should rotate at the same speed as the magnet metal.
Electrons have to move with atoms which move together with the mass.

Scotty.

That is mind boggling.  What about the free electrons in a magnet that are not bound to the atom?  Could they play a role in the flux appearing to be stationary when the magnet is rotating on it's axis?

I'm not convinced that the flux is stationary when the magnet is spinning.  Although, I will agree that the flux isn't changing in time when rotating on it's axis.

If the magnet is spinning while the flux is stationary, wouldn't this cause the flux to twist or to spiral?

Why would the flux remain stationary when spinning on it's axis, but isn't stationary when rotating on it's poles.

What is real and what is not?  LOL

QuoteIf the magnet is spinning while the flux is stationary, wouldn't this cause the flux to twist or to spiral?

If the flux is traveling at sub light I would say no since the flux totally encompasses the disk. You would need some type of impedance to create another "vortex". A magnet already has one  between the poles. I would think you would have to overcome that one in order to create another one from the same mass/magnet. Which if possible would make that pole extend into midair perpendicular to the magnet itself and create the opposite pole on the other side. You would then have 2 sets of poles perpendicular to each other. +       

QuoteYucca,   Now I might be in partial agreement to you with the whole notion of a spinning field. This could be some kind of aether dragging effect. But Scotty1 says he has performed an experiment where a spinning axial disc mag is brought close to a stationary mag, one would think this aether dragging would cause some rotation of the static mag, but it appears not to?

If you place a magnet on an aluminum or copper sheet and move it you feel a huge drag to the metal but if you rotate the magnet on it's axis and move the metal into the spinning you do not feel any drag!
Does this indicate the field is not spinning? At first you would think so but when you realize that metal is only responding to a change in field density and not the field itself.
A magnet spinning on it's axis is a constant density field and brinning a coil into the field will only show a change as you bring it near or pull it away. The time in the field shows no output because for every force line cutting into the coil there is one leaving, so over all no change.

The field does spin with the magnet, you just need a better method to detect it!