Halbach Array | Klaus Halbach | John C. Mallinson

[Aaron]

The Halbach Array effect was first discovered by John C. Mallinson. See this article:

One-sided fluxes -- A magnetic curiosity?
Mallinson, J.
Ampex Corporation, Redwood City, Calif;

This paper appears in: Magnetics, IEEE Transactions on
Publication Date: Dec 1973
Volume: 9, Issue: 4
On page(s): 678- 682
ISSN: 0018-9464
Posted online: 2003-01-06 16:44:34.0

Abstract
It is shown that a previously unknown class of magnetization patterns exists in planar structures which have the unique property that all the flux escapes from one surface with none leaving the other side. A simple case is a constant amplitude rotating vector magnetization where the sense of rotation dictates which surface has no flux. More complicated magnetization patterns are elucidated. The likelihood that the one-sided flux phenomenon occurs partially in the normal write, the contact-printing and the print-through processes of tape recording is discussed. It is concluded that significant improvements in tape recording performance would ensue if means could be found to enhance the effect.

Above taken from:
Welcome to IEEE Xplore 2.0: One-sided fluxes -- A magnetic curiosity?

If anyone has the full article in doc, pdf, etc... please post it. I would love to have a copy.

One article on Halbach Array's:
http://www.uta.edu/physics/main/resources/ug_seminars/papers/HalbachArrays.doc

I have played with this concept for a few years off and on and it really works. The circular version is what I would love to build for a passive floating magnetic bearing system and of this array defeats Earnshaw's Theorem.

"A collection of point charges cannot be maintained in an equilibrium configuration solely by the electrostatic interaction of the charges."

Anyway, this is the closest I found to a real monopole magnet...in reality, the opposite pole is just extremely weakened.

Great simple page at Wonder Magnet...this is where I buy Neo's when I want them.

WONDERMAGNET.COM - NdFeB Magnets, Magnet Wire, Books, Weird Science, Needful Things




















Scientific American article about the Inductrack Maglev system using Halbach arrays--a Maglev train concept using permanent magnets!
Post and Ryutov's abstract about the Inductrack Maglev train system--lots of technical information and formulas about how it works
Way cool...a variable permanent-magnet flux source for laborartory use. This device was not possible before the Halbach array was discovered.
Halbach Array magnetic bearing for rotor applications
Halbach array flux diagrams and calculations.
Our source for all the cool Halbach Array flux diagrams on this page. Thanks!

[Aaron]

just some fun ideas

I posted these several years back in my radianth2o yahoo group forum.


I solved the coral code key mystery. Just kidding!


The below pic is just an idea that is untested.


The below pic I thought of but don't know if it would work. It is a square version of the round version. This is more affordable if it works and easier to do. The round version would require expensive magnets probably and I don't even know where to buy the right magnets for the round version.

[lighty]

One-sided fluxes -- A magnetic curiosity?
Mallinson, J.
Ampex Corporation, Redwood City, Calif;

This paper appears in: Magnetics, IEEE Transactions on
Publication Date: Dec 1973
Volume: 9, Issue: 4
On page(s): 678- 682
ISSN: 0018-9464
Posted online: 2003-01-06 16:44:34.0

If anyone has the full article in doc, pdf, etc... please post it. I would love to have a copy.

Here you go Aaron.

[Aaron]

Thanks for the paper!

[Aaron]

Halbach Array | Klaus Halbach | John C. Mallinson

Any interest in Halbach Arrays?

[rosco1]

New info on Coral Castle

Hi Aaron,

I was alerted to this new video only today. It shows a basic polarity test on the flywheel.

YouTube - Coral Castle - Flywheel Polarity Test


EDIT: I just checked the Youtube page on which that Vid is attached, and it appears that quite a few new vids of Coral Castle have been added, they appear highly interesting thus far. I encourage anyone interested in this subject to look closely at each vid in turn.

[Brownsville]

coral castle info

Hi Aaron,

Check out the recent videos that Jon DePew has at CORAL CASTLE CODE / JON DEPEW / FORMULA of ENERGY

I think that Jon has solved the code and has replicated Ed's machine. I have written to Jon a few times and it would be great if he would participate in a forum like this.

Brownsville

[Altair]

Round Halbach array

Hello everyone,

the round Halbach array is available here:
But the price hurts !

Yesterday night, I was reading Tom Bearden's site and came onto an article mentionning the fact that it is now possible to easily manufacture ASYMETRIC magnets, but as usual, the invention has been suppressed.
Here is the excerpt from:

DoE should release fraudulently obtained asymetric magnets patentsTable of Contents


Cheers

Guy

[[email protected]]

halbach array

Hi All.
The Halbach array when set up as two parallel strips, whilst it does spit out a roller magnet from one end, there is repulsion at the entry.
This I am afraid, still defeats the usefulness of the device for continuous motion in a rotary version.
Sorry folks.

[[email protected]]

Hi Stealth,
just as you suggested, I have experimented extensively with two lines of mags. in attraction.
The "exit" end is tapered out to a "fan" shape.
If the exit end is twice as wide as the entry end, this, because of the inverse square law, provides only about a quarter the roll-back force as the entry force.
When arranged on a drum with good ballrace bearings, you can get quite a good travel rotation.
Then, the original "roller" magnet is held stationary as the stator magnet.

Here's the problem.
Now you attempt to add another track to pick up where the first track "ran out of steam".
Now you find that the second track has much less travel than the first track.
I have found that (in my particular set-up) that at least 60 mm is required of clear space - no magnets near, for adequate run-up.
The whole forward travel relies on this inward "caterpult" effect for travel to a good distance.
Whilst there is some overtravel out of the end of the track - about 15 mm, this precludes it from being "picked up" by the beginning of the second track.
I then made up the second track alongside the first track instead of immediately following the first track - staggered.
There is still a problem with this.
Even though the rollback force is only a quarter of the entry force, and this one would think would be more than adequate to force the exit of the first stator out of its exit track, the final result is that this small loss is cumulative. i.e. for each extra track added, you get less travel force/speed so that the required 3 tracks on a drum 110 mm in diameter, runs out of steam before the full rotation is achieved.
Using more powerful mags. does not solve the problem, as whilst the caterpult force is increased, so also unfortunately is the roll back force proportionately increased.
There may be a way round this, but so far I have run out of ideas.

[[email protected]]

Philipines unit.
Thanks for that Stealth.
Without building it, this looks to me that it would achieve 180 degrees of travel - the upper half disc with the round mags. would I think rotate until fully "meshed" and there be arrested.
End of rotation.
You may like to look at a linear permanent magnet motor I made up.
This is shown in the Patrick Kelly site
http://www.free-energy-info.co.uk in the section on permanent magnet motors.
We spent a total of $35,000 on attempting to convert this principle to a rotary version over a few years.
Having specially shaped neodymium magnets made up for the job is horrendesly expensive.
We finally had to abandon firther attempts at this.
I am sure it can be done, but we just have to be smart enough to "outwit" nature into giving up this energy.