There is a classical engineering solution to this need, which is
guaranteed to be leak proof.
Place a primary winding on the ouside of the container, tightly
coupled to a secondary winding inside the container.
The coils axis points though the container wall.
Either coil can rotate on this axis with no effect on coupling.
You will say, I expect that the high current is in fact DC.
You *could* invert it however.
Brian Whatcott Altus OK
Thanks for reply
But i need only to be able rotate feedthrough which is watercooled.
System such you mention will induce the current also on chamber wall
No winding outside, there is only ac current
Inside the chamber , i need to rotate the induction coil for pouring the
same induction coil requires high current 200 amp. @ 250 volt thus must be
cooled to avoid overheating damages.
So I have to transfer the current, water and rotary motion on the same axis
and keep the vacuum integrity.
Such systems exists, for vacuum induction melting furnaces but cost a lot of
May be I need to use high conductivity water cooled FLEXIBLE copper tubing
than keep the feedthtough fixed ??
le message de
Copper has no fatigue strength, so you'd have to replace it every few
Do you have a sketch you could post a link to, that shows what you are
trying to do? Maybe it would trigger something in the "amassed minds"
David A. Smith
with the appropriate substitutions from either of
"N:dlzc D:aol T:com (dlzc)"
<N: dlzc1 D:cox T:ne
(don't want to make it too easy for spammer bots to decipher.)
When I get it, I will post it on webspace for a couple of weeks, so the
crew here can take a gander.
David A. Smith
A vacuum container wall does not have to be conductive!
You didn't like that one? There is another classical engineering
Visualize a fixed conductor entry which is capable of looping to the
far side of the rotating piece, in line with its axis of rotation.
As the piece rotates, the conductor loops around in the opposite
direction to that in which the rotor moves.
Vacuum container is 300 series steel thus conductor.
I could not visualize, what you means, is it possible that you send me a
sketch or link.?
"fixed conductor entry capable of looping" : You means flexible conductors
attached able to have a torsion. ?
It took a while to visualize it, but the optimal solution is quite
Arrange a fixed entry into the chamber for the water-cooling and
electrical supply. This could be for example, a copper co-axial tube,
with water in the interelectrode gap. This can be absolutely vacuum
INSIDE the chamber, arrange flexible leads to depart the tube end
radially. At least two for power, at least two for coolant.
Fix a stub to the rotating crucible, axially aligned with the entrance
stub. Arrange the leads from the entry stub tube to loop back and
enter this internal roating stub tube axially.
When the crucible rotates, the loops all move slightly, to
accommmodate the rotation.
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