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Author Topic: Magnet motor in Argentina  (Read 225346 times)

silverdragonrs

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Re: Magnet motor in Argentina
« Reply #405 on: April 06, 2006, 02:48:42 AM »
just an idea but why dont we design molds to be made by emachineshop instead of actual peices.... this way we can reproduce the parts as needed and save some money since most of the parts on this device repeat themselves.

also the more i look at this device (peice by peice) the more detail i see being needed... and the less likely i see myself "rednecking" a prototype. I will continue to try but will be glad to assist in a group effort as well.

I am not sure how I can help so just let me know.

I have over two hundred old hard drives that are only 170- 500 MB so useless. I am taking them apart right now if anybody wants some of the parts (disks, motor, magnets, case) just email me and I'd be glad to share.

I am trying to find a magnet that is "polorised through its center" as mentioned before because i think this could work as well in the rotor. does anyone know of a disk magnet that meets the criteria? exp. speaker magnet?

and has anyone figured out if we can leave the magnets uncut? if we can't then does anyone know what cuts to make for this device? I don't quite understand how this part works.

danny

jaybird

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Re: Magnet motor in Argentina
« Reply #406 on: April 06, 2006, 02:58:01 AM »
What software is everyone using to open the FEMM files?

  I would be interested in checking them out also... As a side note, I havent had much luck with a normally magnetized (thru thickness) ring magnet setup the way that you would expect it to work, so the ring magnet must be magnetized thru diameter, or cut in 1/2, 1/3 etc. (havent been able to do that yet, ruined 2 trying tho!)

Thanks
JayBird

hartiberlin

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Re: Magnet motor in Argentina
« Reply #407 on: April 06, 2006, 03:10:39 AM »
Okay, I still had time to do it now,
here are the pics from my simulation.
I have used a pretty small mesh inside the
airgap and have put another center circle into the airgap,
this gives the best true simulation results of the forces.
So if you want to try my FEMM files,
put the red marking for the force calculation integral
onto the center circle in the airgap.

Now it would be nice, if a better FEMM pro can do a LUA
animation with the stator magnets going up and down
one by one and also trying to see, if the torque force on the rotor
is bigger than the force needed to push the last stator magnet
again into the circle.
Many thanks.
Regards, Stefan.
P.S: I have put the origin into the center of the rotor, so the torque
display in the pics is the real torque onto the magnetrotor and it is
pretty huge !
« Last Edit: April 06, 2006, 03:37:05 AM by hartiberlin »

hartiberlin

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Re: Magnet motor in Argentina
« Reply #408 on: April 06, 2006, 03:13:19 AM »
FEMM simulation program can be downloaded freely here:
http://femm.foster-miller.net/

hartiberlin

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Re: Magnet motor in Argentina
« Reply #409 on: April 06, 2006, 03:28:36 AM »
I have downloaded now the
www.emachineshop.com

CAD software and played a short time with it.
It is not bad, but one needs some
time to get used to it.
It can also import AutoCad DXF files !

So, maybe we only need to design the difficult parts
like the rotor cap-lid and the stator magnet holders
with it and for the other parts use
cheap standard parts as ball bearings and rotor
axis etc...

silverdragonrs

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Re: Magnet motor in Argentina
« Reply #410 on: April 06, 2006, 04:12:51 AM »
I figured out how to cut magnets

it is a lot like cutting glass. scar the magnet pretty good on both sides and break. then use a file to smooth it out. don't use impact (a hammer or such) to break it as impact often weakens a magnet if not ruining it all together. just keep scarring it untill you can break it with your hands. as for really thick magnets i have not tryed (dont have any) this technique has worked every time for me on magnets up to 1/2 inch thick so far. if you are trying to create an angled cut just use the file or use a dremel. the seperation/cut has to be fast becuase once you cut it through then the oposing poles will cause stress and often cause breakage.

danny

silverdragonrs

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Re: Magnet motor in Argentina
« Reply #411 on: April 06, 2006, 04:16:04 AM »
the rotor cap lid is simple to make

use the bottom of a pop can (aluminum is nonmagnetic i think... havent checked) then use a rubber malet and a round pipe to shape the curve. use a file on the edges

not very scientific but it will work.

silverdragonrs

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Re: Magnet motor in Argentina
« Reply #412 on: April 06, 2006, 04:58:08 AM »
tao.... and for those of us who did not attend harvard that means.......??? :)

sorry to be more specific.... i can figure out some of that but to begin with could you give me a basic breakdown of what 5Nm is and means and compare it to something common

also what is the aprox HP of this device based on your present figures and are those rpm's reasonable.... I don't know what the average rpm of an electric motor or anyother motor is so i have nothing to compare your figures to.

sorry for all the trouble guys i do not have the education you all appearently have. and as i said i am just beggining in this feild of study. i hope i am not getting on your nerves i know how it can be....

danny

Omnibus

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Re: Magnet motor in Argentina
« Reply #413 on: April 06, 2006, 05:14:09 AM »
tao, thanks a lot for the FEMM graphs and for the calculations. Sounds very promising. Will have to understand better the FEMM program, however, and what the optimum model would be.

Omnibus

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Re: Magnet motor in Argentina
« Reply #414 on: April 06, 2006, 05:24:25 AM »
So, tao, the tendencies so far in the design are to have a whole round rotor magnet, magnetized along the diameter, as in your Bryce drawing (the one with parts made of wood) and rectangular stator magnets. This would provide a better torque than the design with the three (or four) separate rotor magnets, correct?

Omnibus

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Re: Magnet motor in Argentina
« Reply #415 on: April 06, 2006, 05:54:19 AM »
That'll be easier to make, probably. Especially the fact that stator magnets are simple rectangles so we won't need to make their front surfaces concave. You're right about the balancing, as well. Especially at these rpm's.

georgemay

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Re: Magnet motor in Argentina
« Reply #416 on: April 06, 2006, 12:36:10 PM »


So, to get 1 HP out of hartiberlin's design (where the rotor has 5Nm or torque on it) the rotor would have to spin at 1419.46 RPM

T
Tao

Tao,
What was diameter of rotor/stator you used for this calculations?  I do not want to build it too small. :) was it 3.5"?
George

hartiberlin

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Re: Magnet motor in Argentina
« Reply #417 on: April 06, 2006, 12:37:30 PM »
Hi Tao, many thanks for the new great Bryce drawings and the calculations. Maybe, iy you can now render with it several pics which shows the magnets going up and down we can compose of this a complete animation, how the Torbay principle works...
That would be great, if we could have at least an animation of it.
I also saw in my simulations, that it is curious, that rectangular stator magnets seem to have more force and torque onto the rotor and I still ask me, why this is ?? It am still puzzled by this fact ?? Is this logical ?
Okay with also a pure disc magnet as the rotor it will also be much easier to design the rotor, instead of single rectangular rotor magnets combined...
I still have to simulate, if the disc based magnet rotor gives more torque than a few rectangular magnets in the rotor combined...
We also need to do force simulations to see, how big the repelling force is to press one stator again back down in your new pics example, but as the next stator magnet is already liftibg up, this backpressing force will be much lower....
Anyway, this new design looks very good and easy to make ! Thanks!

hartiberlin

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Re: Magnet motor in Argentina
« Reply #418 on: April 06, 2006, 12:50:17 PM »
Also let us be realistic, this principle is just too much mechanical stress to rotate at higher RPM, so we can be lucky, if we get to 300 RPM and can get maybe 10Watts out contineously in the first prototype.... Do you agree ?

hartiberlin

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Re: Magnet motor in Argentina
« Reply #419 on: April 06, 2006, 01:01:15 PM »
Also I ask myself, if wheels will indded have the smallest friction on the lid-cap and if it is not better to have some maybe graphit based sliding contact for the stators at the lid-cap. also it must be probably a real triangular-eponential ramp with no bump at the end, so the stators will not jump too much at higher RPM so it will not be too shaky and wobbling....