Rotational PMM by wizkycho

wizkycho · June 10, 2005, 02:12:23 AM

Quote from: Light on June 09, 2005, 09:45:45 PM
"Another idea...Suggestions about that?"
- Yes, this IS idea. Good for you. And it might work because of unbalanced forces. Unfortunately ideas with balls and "shields" just a dead way. There's no questions (or discussion) about it.
Here's another very good development of your thought.
http://ingenrw.narod.ru/Andv2/Opi2.html
just look at pictures.

"Answer from supermagnete.de ..."
- I'm buying from Dura Magnetics. No problem...

Have You even understood the principles of how RPMM should work ? Describe why it wouldn't ?

ooandioo · June 10, 2005, 04:43:47 AM

Ok. supermagnete.de got me a reply:

Ring with 100mm outer x 60mm inner x 5mm height = 166,43 Euro/piece (if taking 5 = 46,53 Euro/piece)
Ring with 200mm outer x 160mm inner x 5mm height cannot be delivered with strong N42 force, only N38 = 224,42 Euro/peice (if taking 5 = 72,48 Euro/piece)

I will have to think about it, before I go and buy one. Please, if anyone is making some further experiences while testing the system and the shielding, submit here. I'm not afraid giving a lot of money but by now I'm still not 100% satisfied that the shield mechanism will really work. As I said, i think the inner magnets will have to be moved further away from the shield and so the repel force of the outer magnets are not that much (thats why i posted the idea with halbach array). Also I completely understand the shielding idea with high permeable steel and it seems logically.

Explain your experiences with steel shields.

- Andi

ooandioo · June 10, 2005, 06:03:20 AM

I finally made some flux analysis. In the middle you see the outer magnet, as part of the ring. Its a NdFeB 40 MGOe, same as magnet above the shield as part of inner outputsystem. The Shield around the magnet is M-19 Steel (Silicon Iron).

This picture shows open system, inner magnet ring and outer output magnet repell:

ooandioo · June 10, 2005, 06:04:50 AM

This picture shows closed system as described above. Shield takes most of inner magnetix flux:

wizkycho · June 10, 2005, 08:15:19 AM

Quote from: ooandioo on June 10, 2005, 06:04:50 AM
This picture shows closed system as described above. Shield takes most of inner magnetix flux:

tkanks, now it is clearer what we are trying to do.

Quote from: ooandioo on June 10, 2005, 04:43:47 AM
Ok. supermagnete.de got me a reply:

Ring with 100mm outer x 60mm inner x 5mm height = 166,43 Euro/piece (if taking 5 = 46,53 Euro/piece)
Ring with 200mm outer x 160mm inner x 5mm height cannot be delivered with strong N42 force, only N38 = 224,42 Euro/peice (if taking 5 = 72,48 Euro/piece)

I will have to think about it, before I go and buy one. Please, if anyone is making some further experiences while testing the system and the shielding, submit here. I'm not afraid giving a lot of money but by now I'm still not 100% satisfied that the shield mechanism will really work. As I said, i think the inner magnets will have to be moved further away from the shield and so the repel force of the outer magnets are not that much (thats why i posted the idea with halbach array). Also I completely understand the shielding idea with high permeable steel and it seems logically.

Explain your experiences with steel shields.

- Andi

5mm thickness is not sufficient even NdFeB will lose strenght quickly (year or two) if full repel is applied.