Magnet Myths and Misconceptions

[Liberty]

LibertyThe wire(conductive path) dosnt pass through a constant magnetic field,it remains in a constant position in relation to the magnetic field,as the brush on the outer rim never changes position-thus the line(potential wire)between the outer brush and center brush is stationary(fixed) just as the magnetic field is.There is no increase or decrease of magnetic field strength,nor is there a moving wire passing over that constant magnetic field(as the two brushes are in a fixed position)-so there is no induction taking place.In order to fully understand as to how the HPG work's,we need to know what exactly a magnetic field is. And in order to know what a magnetic field is,we need to know how the HPG work's-the two go together in understanding each other.

The conductive path is constantly repositioning itself on a spinning disk (finding the path of least resistance) and is therefore in relative motion in respect to the magnetic field.  There is therefore constant movement as the conductive path is constantly repositioned on the surface of the disk while the disk is in motion, while in a constant magnetic field. 

Liberty

[Magluvin]

Probably one of the more interesting things about the homo polar motor is the fact that the ring magnet is able to spin with the disk and the disk still produces current. Now, is there any lenz braking happening while turning the disk with the ring magnet spinning with it while current is loaded from the disk? Is there resistance to turning the disk with the mag ring spinning with it? If there is, what is the wheel lenz braking against if the magnet spins with the disk?? If there is no lenz braking, and the faster we spin the wheel, the more current we get out without increasing drag, what does that mean to you?  One more thing. If there is lenz braking with using a disk, what can we replace the disk with to avoid it?


Mags

[tinman]

The conductive path is constantly repositioning itself on a spinning disk (finding the path of least resistance) and is therefore in relative motion in respect to the magnetic field.  There is therefore constant movement as the conductive path is constantly repositioned on the surface of the disk while the disk is in motion, while in a constant magnetic field. 

Liberty

Liberty
I really do not think that this conductive path keeps jumping back up to reposition itself. This path between brushes would remain constant-no movement. That is like saying a light beam would bend if we spun a flash light around fast enough-just not going to happen.

[tinman]

Probably one of the more interesting things about the homo polar motor is the fact that the ring magnet is able to spin with the disk and the disk still produces current. Now, is there any lenz braking happening while turning the disk with the ring magnet spinning with it while current is loaded from the disk? Is there resistance to turning the disk with the mag ring spinning with it? If there is, what is the wheel lenz braking against if the magnet spins with the disk?? If there is no lenz braking, and the faster we spin the wheel, the more current we get out without increasing drag, what does that mean to you?  One more thing. If there is lenz braking with using a disk, what can we replace the disk with to avoid it?


Mags

Im guessing you mean a homopolar generator Mag's,not a homopolar motor.
So are saying there is a lenz force,and some are saying there is not. The only way to find answers is to build one i guess. As copper plate here is extremely expencive,i guess i will have to melt down some copper pipe,and make my own disk-say around 12 inches in diameter.Then to wind some very large coils for electromagnet's,as PM's that size would cost an arm and leg.

[TinselKoala]

Probably one of the more interesting things about the homo polar motor is the fact that the ring magnet is able to spin with the disk and the disk still produces current. Now, is there any lenz braking happening while turning the disk with the ring magnet spinning with it while current is loaded from the disk? Is there resistance to turning the disk with the mag ring spinning with it? If there is, what is the wheel lenz braking against if the magnet spins with the disk?? If there is no lenz braking, and the faster we spin the wheel, the more current we get out without increasing drag, what does that mean to you?  One more thing. If there is lenz braking with using a disk, what can we replace the disk with to avoid it?


Mags

You should buy a copy of Tom Valone's Homopolar Handbook. On the cover of that book is a photo of a large industrial homopolar dynamo, that is used in industry for billet heating and other things where you need huge currents but not much voltage. The way it works is that it is spun up to speed by hydraulic or other motive power, with peripheral brushes retracted off the disc. Then when it is at speed, with huge flywheel energy storage in the rotating disk, the peripheral brushes are slammed down onto the periphery of the disc and huge power is drawn off as very high currents for a few seconds as the rotation slows.

But in the text of the Handbook, you will find copies of the original research by Tom, and also the DePalma-Tewari documents, and a lot of other great information about homopolar dynamos. Many of the questions and problems posed in this thread are fully answered and explained in the Homopolar Handbook.

One of the more interesting things in the Handbook is the description of Tom's Master's thesis experiment, where he actually put an LED voltmeter _on the disk_  rotating with it. Can you guess his result?