STEORN DEMO LIVE & STREAM in Dublin, December 15th, 10 AM

[0c]

[A author=Magluvin link=topic=8411.msg221616#msg221616 date=1263267555]
Well look at OC go over here!  =]   
Hows it going OC?

Will we see any battery operated toys on yer bench any time soon? ;]

Magluvin
[/quote]

Not until I can buy one at Home Depot.

[gravityblock]

Not true, at least for some materials. Here's the permeability curve for mumetal:
http://www.magnetica.fr/repository/Fig26.gif

Notice that permeability when 0% saturated is only about 30,000 but it reaches its peak of almost 100,000 when partially saturated. If you can bias the core to the permeability peak without using any external power, you will have stronger attraction when the coil is unpowered and will require less power to drive the core into saturation.

I knew someone was going to say this.  You are correct.  I was trying to keep things simple.  There is permeability and relative permeability.  There is also relative permeability within the same material according to saturation which is the permeability curve.

I agree with you completely.


GB

[lumen]

It doesn't matter much WRT to saturation. It does matter WRT coil orientation. The way Steorn has their coils oriented in the eOrbos on display would require the magnet pairs to have the same polarity.

You could be right, but it just don't make sense. Why use a pair of magnets and place the same polarity out when it would be much easier to simply use one magnet, or a long skinny magnet, or whatever would work best since you only need the same polarity facing out?
It takes more power to change domain direction than any energy gained by the change. So unless the rotor magnets can provide near saturation in the core and provide it along the same direction as the coil, it could never be OU.
I suppose we don't have long to wait. Although I doubt these tiny details that make all the difference are going to be revealed any time soon.

[0c]

It takes more power to change domain direction than any energy gained by the change. So unless the rotor magnets can provide near saturation in the core and provide it along the same direction as the A, it could never be OU.

The rotor magnets don't provide significant saturation in the core. The main objective is to reduce the counterproductive effects of inuced EMF and Lenz effect opposition.

Believe it or not, it takes less energy to rotate the partially aligned domains 90 degrees than it does to rotate randomly oriented domains into alignment. Don't believe me? Try it.

[onthecuttingedge2005]

believe me, if you can find away to push a dead car over the hill and get over unity, I'll vote for you. wait till the car settles at the bottom of the hill, tell me which contains more energy. huff and puff to get that car over the hill. I am exhausted, I am going to take a break!

like I have been preaching, lazy conservative slave is what energy is.

have you been paying attention?