Working Magnetic Motor on you tube??

[CLaNZeR]

@CLaNZeR,

You may have said it already but I've missed it, did you try measuring the rpm when spinning it by hand and what's the wind down time with and without the magnets?

Hi Omnibus

No not yet. I will do all that when I am happy that the height adjustments are all in place and I have everything ready to go.
Then I can do a spreadsheet showing the Dummy Runs and loaded runs with speed against time.

[Charlie_V]

Hey guys,

I don't have a lot of time to post this since I'm on my lunch break and my salad is getting cold... hehe.  All the effort here is really good.  This setup reminds me of Jon Depew's work with his magnetic gears and equilibrius grid: 

http://www.coralcastlecode.com/id28.html

Many months ago Jon posted that he had stumbled upon a great discovery (about the same time he blocked my AIM name because I suppose I was sending him too many messages .)  Anyhow, I wonder if he discovered something similar to this motor?  I think Jon describes the spinning gears as a resonant expanding magnetic field.  Perhaps the counter spinning magnet causes a resonant collapsing field which imbalances the wheel and causes it to lock into motion?  My salad is now completely cold!

Keep up the good work,
Charlie

[MeggerMan]

Hi Everyone,
I phoned e-magnets in the UK today and if we can get a big enough order together then they can get some diametrically magnetised disk magnets (not rings) made up. So what they have on their website they can magnetise diametrically, but only as a one off.
http://e-magnetsuk.com/magnet_products
They have 10,12,15,19,20,22,25,40mm dia and thickness of various sizes from 0.4mm to 10mm
The lead time is a couple of weeks though.

One interesting comment the sales person mentioned was that Neodymium Iron Boron (NdFeB) magnets are extremly difficult to demagnetise using another magnet.  Other magnets like alnico need to have a keeper to retain their magnetic strength.
Only heat and physically knocking a Neodymium will effect it.
N42 are ok up 80C.
Also they have some high temp N33 suitable for 200C, BUT and this is a big one, these are even harder to demagnetise in a demagnetising unit.
He said they had two very large cyclinder magnets in a vertical tube and they are apposing each other field wise, 8 inches apart and have been that way for 3 years. He said if the field strength was going to reduce, the gap would have reduced but it has not.
So therefore, I very much doubt that AL's setup will degrade the magnets even after running for months on end.
I remember reading that to demagnetise a Neodymium you need to overpower the existing field in the magnet with a stronger field in the apposing direction and with the rotor and stator gap being about 5mm or more, then this is not likely to happen.

I have had an email back from K&J magnetics in the US and they have the following in stock that I enquired about:
R834DIA
D22
D48
D4C

They have to state the exact value on the customs label and they cannot mark it as a gift, so try and keep your value below the 18GBP limit unless you are made of money.

Regards
Rob

[CLaNZeR]

Thx Rob for the Info.

A follow upto that is a Interesting post from Andy (NEO) of at Steorn today.

***********
I wouldn't expect any depletion in the current set up. The materials stability in terms of shape, coercivity and airgap will make them virtually impossible to lose any power. Only elevated temperatures above 120 deg c and high, stray, electro-magnetic fields in the order or 2 Tesla reversed through the sample will relax the domains. The action of the stator's alternating polarity on the rotor will have no effect in terms of losses.
Anisotropic Sintered diametrically magnetised NdFeB is relatively new in terms of particle alignment during the pressing cycle in that phase. Isotropic Bonded NdFeB materials (10 mgo) are more common for applications requiring this type of orientation. This may be relevent in terms of power to weight (torque) ratio of 35 + mgo materials. Anyway, well done so far, I'm sure the effect will help with continued study in this area.

There will be Bonded Neodymium version / experiment happening in the next couple of days.
***********

[ken_nyus]

I also remember reading somewhere on this forum, about a forum member who has kept two magnets clamped togther in replusion for almost a year(?) now, and with his measurements there has been no difference in the strength of the magnets. Don't have the reference handy but that is what I remember.