Rotational PMM by wizkycho

[ooandioo]

Yes you are right, but a 1 or 2 cm thick magnet will cost >300? - to much for testing...

Any news from you about building?

-- Andi

[wizkycho]

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

If the magnets are polarized through height (thickness) than we can maybe order 6 pieces.
Three guys each gets 2 pieces. they make six but send them to three different adresses.

145 E each for two magnets which can be stacked to make 1cm thick ring magnet which is enough for testing.
i'm talking about 200mm outer x 160mm inner x 5mm height N38 ones.

I'm in if magnets are polarized through height. otherwise they can not be stacked.

some more questions:
Are the magnets coated to prevent corrosion and with what ?
What is the price for postage and packing, I live in Croatia ?

Andi, are you IN. and we need One more experimenter...

[wizkycho]

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

If the magnets are polarized through height (thickness) than we can maybe order 6 pieces.
Three guys each gets 2 pieces. they make six but send them to three different adresses.

145 E each for two magnets which can be stacked to make 1cm thick ring magnet which is enough for testing.
i'm talking about 200mm outer x 160mm inner x 5mm height N38 ones.

I'm in if magnets are polarized through height. otherwise they can not be stacked.

some more questions:
Are the magnets coated to prevent corrosion and with what ?
What is the price for postage and packing, I live in Croatia ?

Andi, are you IN. and we need One more experimenter...

BTW I'm currently searching some chinees manufacturer. I've heard they are much cheaper and still maintain quality.

[ooandioo]

The ring magnets are polarized through 5mm, so we can put the output magnet above the ring.
I will ask them for delivering option. I think they can split the order and send to different locations. Magnets are covered with Nickel, i have some other Magnets from them - they are very good in quality.

Lets see what your manufacturer says.

-- Andi

[wizkycho]

The ring magnets are polarized through 5mm, so we can put the output magnet above the ring.
I will ask them for delivering option. I think they can split the order and send to different locations. Magnets are covered with Nickel, i have some other Magnets from them - they are very good in quality.

Lets see what your manufacturer says.

-- Andi

I got replay from chinees manufacturers
the best is:

Material:               Sintered NdFeB
Size:                   D200xd160x10mm (ring magnet)
Coating:                Ni
Magnetization:          MAGNETIZED
Magnetization direction:10mm

Grade/Quantity/Price: N38/1pc/FOB Hong Kong USD83.34/pc.
Grade/Quantity/Price: N40/1pc/FOB Hong Kong USD88.95/pc.

The express freight for 1pc to reach your door is USD135.00.

this is cheaper offer and my friend recently ordered something (from china, don't know if it is same manufact.)simmilar and the magnets where very strong.

http://www.permanentmagnet.com