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

[PaulLowrance]

What I still don't get is how Steorn is charging a 0.98 Henry toroid in ~ 10ms. I guess that's the secret, the trillion dollar question, no?

That only thing that comes to mind is how square loop the Metglas core is. Therefore, the inductance meter they used seems pretty good, as it's probably difficult to measure the inductance with such a square loop core.

We'll have to see when someone builds one of these guys using the metglas MAGAMP core. 

[PaulLowrance]

I'm curious what Sean means when he mentions that the use of a torroid is irrelevant in http://www.steorn.com/forum/comments.php?DiscussionID=62319&page=1#Item_14. Anyone have an explanation?

Cheers,
Adrian

Hmmm, I don't see where Sean said that.

[teslaalset]

What I still don't get is how Steorn is charging a 0.98 Henry toroid in ~ 10ms. I guess that's the secret, the trillion dollar question, no?

I guess it's not 0.98 Henry during the whole period of time.
The larger the current, the lower the permeability and thus thus the smaller the Henry value?

[edit]
Something is strange here.
At the first part of the third video the coils are measured.
Now, the Orbo coils is measured 0.961 and 0.984 Henry at the position where the magnet is present. In that position the core should be already saturated, right?
That would mean that the coil value is way higher in the out of magnet range area.
Any comments to that observation?

[edit 2]
I have to correct myself here. If the core is a metglas one, it's is almost al the time saturated. So that means that the wire has a very low resistance in order to load the coil that fast.

By the way Naudin updated his site with some interesting findings on loading his coils with extra thick wires.
See: http://jnaudin.free.fr/steorn/indexen.htm#Orbo

[adrians]

Hmmm, I don't see where Sean said that.

Sean is being quoted about comments he made on a particular replication attempt. Quoting the quote - "With respect to the topic in hand (i.e. the supposed Al 'replication' I find it amusing at several levels, the focus on the use of a torroid (that is irrelevant) and so on".

Update: I seen now in the original thread that I might be misunderstanding the context. How do you guys read his response here - http://www.steorn.com/forum/comments.php?DiscussionID=62326#Item_46 ?


Adrian

[i0n]

A couple of interesting quotes from Sean. Nothing really new but some confirmation regarding the theories involved.

There is no back emf in any of the coils in the experiment shown - it is not a case of one coils Back EMF cancelling out the other.

overconfident:What core materials are you using?


Just a soft magnetic material - I will not go into the details - sorry.

overconfident:Is there any hard magnetic bias in the toroidal cores?


No

The magnetic arragement on the rotor is the same in both cases, an N pole above an S pole (or the other way around). The coils in the pulse motor (like the coils on the Orbo motor) are both facing up

There is no back EMF in any of the coils due to the motion of the rotor. All coils suffer CEMF during the inductive rise and collapse of the field.

Thanks overconfident for some of the questions.