I have seen the video many times, and also your explanations, but there is a few holes in your explanations you haven't taken into account
(That's how I feel about it, anyway - so never mind ).

Perhaps, perhaps not. I have thought of this motor a lot. Time will tell.

There is no guarantee that the video is not a trick - I can see a distortion every same place of the stator magnet.
As it encrease the speed, the distortion is just moved to another position.
Look close and you'll see that the acceleration is also very sudden at the very same time this happens.
Well, so I assumed this video was a trick.

The video is no trick. What you see is just a video distortion. Look in your mailbox tomorrow. I have posted you proof.

Anyway, an array of equal magnets will distribute the magnetic field in 90 degrees across the length only in its middle,
and there will also bee the most attractive place to attract a smaller magnet.
The flux regardless of magnetic angle is however even through the whole magnet array but as the angle shifts,
the attractive force to another magnet will be less powerfull even if the flux density is the excact same all the way.
So that's why I asked.

Yes, you are right about the most flux being in the middle of the stator array, but you forget that the rotor magnets have no way
of getting near the stator in that area. So it dosen't matter in this case. The only way to seek the most flux is to rotate towards
the most narrow gap, and this gap is at the end of the stator magnets. The rotor magnet will not reach the same high flux levels
at the middle area. The gap to the wall is just to great. This is why it does seek to find the flux at the narrow end gap.
Because of the angled gap difference between the two sides of the rotor magnet there will always be a twist to the end.

It will be interesting to see your final product anyway. Good luck
Vidar

Thanks / Honk

Wow, pretty expensive. That equals to $2450 US.

I hope my own magnet request comes out cheaper.
I'll get the price in grade N38, N45 and N50, perhaps this week.

I sent the request to both www.magnesy.eu and to www.magnet4less.com but only Magnesy have responded so far.
They'll get back to me soon. Just to be pricewise I guess I will have to get more quotes from several other suppliers.

Don't forget to keep an eye on the updated Drawing pack.
http://www.overunity.com/index.php/topic,3456.msg58338.html#msg58338

I have now sent the magnet requests to a total of nine manufacturers, and also Magtech as you suggested.

www.magnesy.eu                <--- They will deliver the magnets for $1915 US (shipping and Vat included)
www.magnet4less.com        <--- No response so far
www.kjmagnetics.com         <--- No response so far
www.cy-magnetics.com       <--- No response so far
www.buymagnet.com          <--- They will deliver the magnets for $1328 US (shipping and Vat included)
www.magnetsales.co.uk      <--- They will deliver the magnets for $3405 US (shipping and Vat included)
www.supermagnete.de         <--- They could not make the magnets.
www.magtech.com.hk          <--- No response so far
www.ibsmagnet.com            <--- They were not interested in making the magnets.

I guess we have a winner. -> www.buymagnet.com
Now I just need to get the price on Supermalloy.

I don't think the machining should be that hard. It's standard procedure to machine neos (using the right tools) into the desired shape.

If any of you guys reading this know any good custom magnets suppliers, please tell me of those.

If necessary I'll buy a gauss meter and measure every single magnet to match them best possible.

deleted as it loaded incomplete

Hi Honk!
I just read you're already ordering the magnets...

No, I haven't placed the order yet. Still waiting on the best price.

Thanks for the other suppliers.
Actually I reguested a an quote on 200 custom wedge shaped motor magnets 1.5 years ago at both Neotexx and Magnesy.
Neotexx quote was at pricy $1640 US, shipping included.
But Magnesy was cheap at $515 US, shipping included.
Guess who got the order from me.

I hope Magnesy is still competitive in the custom magnet business.
They are reliable and always deliver on time.

Here are a couple sites you may want to check out for magnets.

http://www.armsmag.com/index.html

http://www.amazingmagnets.com/index.asp

Thankyou. I checked them out.

Quoted from www.amazingmagnets.com
"We are unfortunately unable to produce very small runs of products due to overhead involved."
"If you are able to use a quantity of a specific part, please let us know and we'll let you know what the minimum quantity is for a given size."

Now I have done some simulations on the Paul Sprain motor. My findings are not very suprising, but nor as expected. I made a spiral out of 22 magnets. A rotor with 2 magnets. The sample steps is in 15 degrees, one for each magnet. The end of the magnet array I did put pure iron which I turned into a magnet for 15 degrees - that should be approx 25ms in 100 rpm.

First I simulated the sum of all forces during one revolution where I just leaved the iron be iron for the whole revolution. The sum of forces is almost zero. Hav in mind that the resolution is only 15 degrees, so I did get +669Nm in total which is an average of 27Nm in one revolution. Taken in account that the most torque measured was between +80 000Nm -80 000Nm, 27Nm is as good as zero.

Now I turned on the electromagnetsimulation for 15 degrees. The sum of all torque is now -34 000Nm with an average of 1416Nm. Average torque is what that counts to calculate the energy output.

So then I did remove the stator magnets, and leaved the electromagnet alone. Guess what! Average torque of one revolution is 3250Nm.... Well, the corase resolution are playing with me here, so make your own conclusions.

PS! The motor in my simulation was made 5 meter in diameter and 1 meter thick, hence the high torque.

If you want to play with this simulation, a FEMM file are attached here. Use LUA script attached. It can be modyfied to suite your own measurements, but make the last iron piece in the stator into an oposite polarized magnet for 15 degrees rotation starting at 90 degree of the rotor and clockwise.


Br.

Vidar