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 patents

The easiest way to frustrate those plans—or to have a good chance to frustrate them—is to get the "special folks" to forcibly tear back out of U.S. Department of Energy hands the 1990 patented process for easily making permanent magnets (PMs) with anisotropic (asymmetric) field strengths laterally (left and right) to the line between N and S poles. In short, the PM can be made with a stronger field on its left than on its right; flipping it on the other side will reverse which side is the stronger magnetic field. Two inventors originally obtained a U.S. patent on the process in 1990. DoE, finding out about it, took the lead inventor and gave him a U.S. government grant. Then they had him refile the same process for an international patent obtained in 2001. In that patent, the DoE stated what apparently is a blatant lie, stating that all the work had been done under that U.S. Government grant, and thus the U.S. government has certain rights to this invention. In other words, the U.S. government (DoE) took over the complete control of it.

Then they had the key inventor obtain yet another U.S. patent in 2004, again essentially on the same process with a “good energy product” (strong effect).


Given such anisotropic-field magnets available, any fool can then use them to quickly assemble a self-powering permanent magnet motor or motor-generator, that powers itself and a load. In less than 15 minutes! If the magnets are in production and appreciably available, everyone everywhere—universities, U.S. laboratories, foreign laboratories, etc.—can and will build self-powering PM systems, demonstrators, etc. like gangbusters. It will literally result in a violent explosion of free “energy from the vacuum” self-powering systems into the limelight and worldwide, at an extraordinarily rapid pace.


Our DoE has apparently deliberately withheld this information (the fact that it has possessed self-powering asymmetric magnet motors and motor generators since at least 2001) from the President, the Congress, the scientific community, and the American Public. If so, in my personal view then this borders on high treason against the U.S.A.


We are fervently hoping that some “special folks” in the U.S. who do not wish to see the country destroyed will yank that process right away from the DoE and forcibly put those magnets into production and sales. If that can be done so the magnets are available, then in three months thereafter you can have a dramatic change of the entire U.S. scientific community, the government, etc. and the energy crisis worldwide will be solved forever. That also will rapidly result in solving most of the present depressive economy problems as well.

Here are some references:

Vijay K. Chandhok and Bao-min Ma. “Method for producing a noncircular permanent magnet”. United States Patent No. 4,915,891, issued April. 10,1990.
Abstract: A method for producing a noncircular magnet having asymmetric magnetic properties along axes thereof. A particle charge of composition from which the magnet is to be produced is placed in a container, heated and extruded within the container to compact the particle charge to substantially full density. The particle charge may include at least one rare earth element. The particle charge may be extruded through a noncircular extrusion die, specifically a rectangular die.



Vijak K. Chandhok, WO/2001/084569 A1) “Method for Producing through Extrusion an Anisotropic Magnet with High Energy Product”, International patent, 9 Mar. 2001.
Note (quoting): “This invention was made with government support under a small business research and development grant for "A Simple Process to Manufacture Grain Aligned Permanent Magnets" awarded by the U. S. Department of Energy (Grant No. DE-FG02-97-ER82313). The Government has certain rights to this invention.”
Abstract: A method for producing an anisotropic magnet with high energy product through extrusion and, more specifically, by placing a particle charge of a composition from the which magnet is to be produced in a noncircular container, heating the container and particle charge and extruding the container and particle charge through a noncircular extrusion die in such a manner that one of the cross-sectional axes or dimension of the container and particle charge is held substantially constant during the extrusion to compact the particle charge to substantially full density by mechanical deformation produced during the extrusion to achieve a magnet with anisotropic magnetic properties along the axes or dimension thereof and, more specifically, a high energy product along the transverse of the smallest cross-sectional dimension of the extruded magnet.



Vijak K. Chandhok, “Method for producing through extrusion an anisotropic magnet with high energy product”, U.S. Patent No. 6,787,083 issued on Sep. 7, 2004.
Abstract: A method for producing an anisotropic magnet with high energy product through extrusion and, more specifically, by placing a particle charge of a composition from the which magnet is to be produced in a noncircular container, heating the container and particle charge and extruding the container and particle charge through a noncircular extrusion die in such a manner that one of the cross-sectional axes or dimension of the container and particle charge is held substantially constant during the extrusion to compact the particle charge to substantially full density by mechanical deformation produced during the extrusion to achieve a magnet with anisotropic magnetic properties along the axes or dimension thereof and, more specifically, a high energy product along the transverse of the smallest cross-sectional dimension of the extruded magnet.

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P.S. I highly recommend everybody to go through the whole site, epecially the "Selected Correspondence". It will enlighten you on some pretty serious matters...

Table of Contents


Cheers

Guy

[stebra@xtra.co.nz]

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.

[stebra@xtra.co.nz]

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.

[stebra@xtra.co.nz]

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.