Radus Boots

[gyula]

Hi Rubberband,

It would be much better for you to get any answer if you were to make a drawing in which anyone can easily identify which parts are the permanent magnets and which parts are the soft irons, I think.

[BrentA929]

Wesley Gary's Magnetic Motor

Armagdn03,

Thanks for the link...

I get what you are saying about the switching. Not that I understand it enough to be able to construct or replicate it. Have you tried to duplicate this effect? I thought it was interesting that Wesley was also able to generate electricity from a coil attached. I guess it's all about the change in polarity.


Thanks, Brent

The switching can be done in a variety of ways. If you consider "Hopkinson's law: the magnetic analogy to Ohm's law" and the fact that all flux will take the path of least resistance you can imagine a few switching methods.

If you have two paths for the flux to travel coming out of a magnetic source (permanent magnet) the flux will tend to the path of least resistance. If you the two paths alternate in their effective "resistance" or magnetic reluctance, the flux path will switch along with it.

Reluctance can be changed by saturation of the core (or part of the core) along axial lines of the pm flux, or orthogonal to it (this could take the form of parametrics), which will also change permeability. You can also change gap spacing, or by moving something (ferromagnetic material, or another permanent magnet) in relation to to the Bloch wall.

It is relatively obvious in my book why the MEG does not work as described. If you really wanted to make that guy run, I would ditch the trigger coils which create their flux paths along the same path as the magnet, and go for ones orthogonal to it. This will change the permeability of a section of the core increasing the reluctance of the loop associated with it. The result is still a change in the flux path, but now the output coils are not inductively connected to the trigger (which can be mechanical like in Wesley gary's motor, or electric).

Hope this helps!

Wesley Gary's Magnetic Motor

[Savvypro]

I tried to buy the two listed books:

Nature of Magnetism
and
Handbook of Magnetic Phenomena

Managed to place my order, but got emails from amazon saying they had been sold out.

Anyone have spare copies?
Or know where or if they can be gotten in digital form?

[Aaron]

Handbook of Magnetic Phenomena

Handbook of Magnetic Phenomena is still available but the least expensive copy in Amazon is $99
Amazon.com: Handbook of Magnetic Phenomena for Electronic Engineers (9780442211844): Harry E. Burke: Books

Amazon doesn't seem to have the other anymore.

[Savvypro]

Handbook of Magnetic Phenomena is still available but the least expensive copy in Amazon is $99
Amazon.com: Handbook of Magnetic Phenomena for Electronic Engineers (9780442211844): Harry E. Burke: Books

Amazon doesn't seem to have the other anymore.

I can only order the ones with international shipping. Found one on amazon.co.uk for less then it would cost on amazon.com (cheapest one for me is the $120 one), but only time will tell if the book I ordered is still available.

[blackchisel97]

This isn't 100% related to this thread, more in line with Bob Teal but they all have something in common so I decided to use this link to bump - GAP Power, Magnetic Neutralization

Vtech

[Armagdn03]

Armagdn03,

Thanks for the link...

I get what you are saying about the switching. Not that I understand it enough to be able to construct or replicate it. Have you tried to duplicate this effect? I thought it was interesting that Wesley was also able to generate electricity from a coil attached. I guess it's all about the change in polarity.


Thanks, Brent

Absolutely I have tried it!

I have done it with small ferrite cores "tap" into a stationary pm magnetic field. Problem is that most ferrite do not change their permeability very much meaning the effect is somewhat small with that material.

I would suggest using square loop Mag Amp cores, with a square hysteresis curve. This means that a small input yields large change in permeability. These are very hard to get however, and I seem to have been blacklisted from one of the only dealers of large ones (if anybody has an in with Hitachi metals, I would love to purchase some of these!)

[Tishatang]

Switchable permanent magnet tool holders ad:

Magswitch

Have seen cheaper quality units to hold things on drill presses, lathes, etc.
Probable same principal as radux boots?