Magnetic braking of magnets sliding along a sloped aluminum surface

[Magluvin]

 


Quote from: Magluvin on May 21, 2009, 08:07:26 AM

    Set the magnet to slide down. If flux is flowing into the Al. from the pole facing it, then dragged through the Al. due to the magnet in motion,being bent  upward/dragged/held back from where it came, the exit point of the aluminum would be higher in the aluminum, above the magnet, thus a change in the path of flux from the norm.
    But, if flowing out from the outer pole of the magnet, the one thats not facing the Al., then the flux direction is not influenced by the Al. drag before entering the Al. So the  point of entering and exiting will be in different from each other.

Oc said...

Are you trying to say that Lenz law is viscous? That there's a delay? Or that the oppositional field is actually created before the magnet arrives?


What Im trying to convey is, IF flux is comprised of flowing particles, then there must be direction.
We say the word, field, without going further than that. If flux has particle flow, the force that attracts and repels THE particles themselves, MAY not follow Lenz laws, except relative to where the particle is at the time.
So if particle flow exists, then the particle is going to be traveling, into the moving aluminum, out of the moving  aluminum, yet the force that caries it is constant, and the particle cannot be in the aluminum and in the free air at the same time.
Lets say we get rid of the particle, can we say it wouldnt make a difference either way?
What else could it be?

Magluvin 

[TinselKoala]

@TK,
nice vid, you mentioned above that earth flux is pretty negligible compared to the mag flux. Do you think this ratio of flux strengths is in the same ballpark to the ratio of observed forces (braking force/seperation force)?

I have no idea. I would guess not, since the BH product of these magnets is pretty darn high and that means a heck of a lot of standard flux lines in there, and only 4 from the earth, it's probably 5 or six orders of magnitude difference, we're talking parts per million here I think. And the repulsion  to braking force ratio is much much higher than that I think and can be strong enough to levitate the magnet completely. The eddy drag and levitating forces should be orthogonal, I think...

Errm... The quoted vid does not demonstrate the asymetric behaviour being discussed?

Not only that but he describes it incorrectly. Electromagnetic drag? Well, I suppose. That's like calling Chartres Cathedral a building. It's correct, as far as it goes, I suppose...

Maybe these are really Léon currents instead of Eddy currents.

[Yucca]

I have no idea. I would guess not, since the BH product of these magnets is pretty darn high and that means a heck of a lot of standard flux lines in there, and only 4 from the earth, it's probably 5 or six orders of magnitude difference, we're talking parts per million here I think. And the repulsion  to braking force ratio is much much higher than that I think and can be strong enough to levitate the magnet completely. The eddy drag and levitating forces should be orthogonal, I think.

Thanks for the info.

One more quick question:

Do you think there´s a chance the seperation force could somehow be seperated from the lenz braking force, say with lamination techniques etc? I suppose a better way of asking is: do you think the (braking/seperation) ratio could be varied with the aim of minimising braking and possibly making the seperation force the strongest?

[WilbyInebriated]

Errm... The quoted vid does not demonstrate the asymetric behaviour being discussed?
edit: woops, AbbaRue already said this.

yeah, errm... you must have missed my response to abbarue also then. 
my bad though i did say experts, which infers all of you and my sarcasm was actually directed at just one person.

[Yucca]

yeah, errm... you must have missed my response to abbarue also then. 
my bad though i did say experts, which infers all of you and my sarcasm was actually directed at just one person.

Lol, no worries.

note to self:
stop posting without reading to the end of the thread.