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Author Topic: Magnetic 'Lens'  (Read 31744 times)

truesearch

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Re: Magnetic 'Lens'
« Reply #15 on: December 21, 2010, 06:26:47 PM »
@armagdn03

Thanks for your help ~ I look forward to seeing your results on this.

truesearch

DreamThinkBuild

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Re: Magnetic 'Lens'
« Reply #16 on: December 21, 2010, 07:29:29 PM »
Hi All,

I've been busy with the holidays and family coming to visit.

In the wheel setup I still think it will still find a sticky spot on the edges. I'm wondering though if instead of having the magnets perpendicular to the control magnet, angle them back 45 degrees on the sphere. It would look more like an arrow but the south facing field would be toward the back.

Hi Tak,

I used a steel ball bearing for the sphere. The magnets are directly pushed onto the sphere. The ring magnets are from K&J Magnetics http://72.3.133.7/proddetail.asp?prod=R636 . These have just the right inner diameter(3/16") to fit on the standard Lego shafts, which hold it in place. I have not tried a cube yet but might be interesting.

Hi Armagdn03,

I would be very interested in seeing the output of the magnetic simulation. If you have time could you try to simulate with the outer magnets swept back 45 degrees? Thank you.

truesearch

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Re: Magnetic 'Lens'
« Reply #17 on: December 21, 2010, 07:53:16 PM »
@DreamThinkBuild:

Not sure if I followed your idea on rotating the magnets. . . . Is this drawing sort of what you had in mind?

truesearch

armagdn03

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Re: Magnetic 'Lens'
« Reply #18 on: December 21, 2010, 08:17:14 PM »
Some preliminary photos for visulization (2d)

These are a 2d version of the original array,

http://i210.photobucket.com/albums/bb275/tortuga0303/11.jpg
http://i210.photobucket.com/albums/bb275/tortuga0303/12.jpg

and an "improvement" where I cut off the pole at the bloch wall, seems to get better results.

http://i210.photobucket.com/albums/bb275/tortuga0303/21.jpg
http://i210.photobucket.com/albums/bb275/tortuga0303/22.jpg

truesearch

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Re: Magnetic 'Lens'
« Reply #19 on: December 21, 2010, 08:30:32 PM »
@DreamThinkBuild:

Oops! After re-reading your post I realized that you were addressing the magnets in the "beam" array. My bad. . . .

Is this more like what you had in mind??

truesearch


DreamThinkBuild

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Re: Magnetic 'Lens'
« Reply #21 on: December 21, 2010, 10:15:23 PM »
Hi Truesearch,

You got it. Make them 45 degrees so it minimizes the south pole influence.

Hi Armagdn03,

Thank you for the simulation images. The design of the Leedskalnin beam amplifier is really great. It looks like all the coils are series wound. Any other information on that build?

phoneboy

  • Jr. Member
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  • Posts: 97
Re: Magnetic 'Lens'
« Reply #22 on: December 21, 2010, 11:39:36 PM »
Looking @ that vizimag pic, seems like your lens is an incomplete halbach array? You can do some really interesting things with them!

dasimpson

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Re: Magnetic 'Lens'
« Reply #23 on: December 22, 2010, 03:07:32 AM »
i think the kogging will still happern ethern with a magnetic beam but i feel that the kogging would be greatly reduced because of the distance between the magnets

truesearch

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Re: Magnetic 'Lens'
« Reply #24 on: December 22, 2010, 05:42:23 PM »
To all:

The simulated-flux field posted by @armagdn03 doesn't seem to reflect the experiments done by @DreamThinkBuild. I'm not sure what this tells us. ??? Perhaps Vizimag isn't calculating this design correctly as it is a 2D program and this is a 3D array.  :-\

@DreamThinkBuild, do you still have your "lego" build of the array? How difficult would it be to assemble a wheel with several magnets in repulsion on it and see what happens? I mean, if your time permits this.  ;D

Currently I'm not setup to do any experimental builds  :(

truesearch

truesearch

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Re: Magnetic 'Lens'
« Reply #25 on: December 22, 2010, 06:02:57 PM »
@Jerry

I agree complete on your points. And just because the simulator doesn't offer much promise, the "reality" will probably only be evident in an experimental build.

truesearch

armagdn03

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Re: Magnetic 'Lens'
« Reply #26 on: December 22, 2010, 07:56:49 PM »
@J Volland

Agreed,

Im purchasing a few magnets specifically for this. Well see what is what.

tak22

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Re: Magnetic 'Lens'
« Reply #27 on: December 22, 2010, 08:24:47 PM »
I have a fully built array which seems to throw a pretty
impressive beam, but my interpretation of the patent led
me to make the central sphere nonferrous. I plan to try both
a ferrous block and a sphere to see what difference there is.

I don't have any bar magnets, just cubes and discs, but
I'll mount a few on a spinner and see if anything happens.

None of this will happen until next week.

tak

truesearch

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Re: Magnetic 'Lens'
« Reply #28 on: December 22, 2010, 08:38:02 PM »
Sounds promising! I look forward to see what your results are in this experiment.

The reason I drew "bar-magnets" on the wheel diagram was simply to get the N/S poles seperated (via bloch-wall).

truesearch

truesearch

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Re: Magnetic 'Lens'
« Reply #29 on: December 28, 2010, 10:12:57 PM »
@armagdn03, @tak22

Hope everyone had a great Christmas holiday time.

Have either of you had any time to play with this "magnetic-beam" experiment anymore?

Wishing the best to all, and a happy, rewarding new year to everyone! 8)

truesearch