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Registered Member #30
Joined: Fri Feb 03 2006, 10:52AM
Location: Glasgow, Scotland
Posts: 6706
This looks great! I'm not surprised the 50mm2 cable gets hot though. Skin effect means that most of the copper in it does nothing. You would get better results with, say, 20 pieces of 2.5mm2 PVC insulated wire bundled together.
Why can't it play high MIDI notes, what happens when you try?
Registered Member #205
Joined: Sat Feb 18 2006, 11:59AM
Location: Skørping, Denmark
Posts: 741
zrg wrote ...
Second day over.
snip
Looks like big coils need primary slider motor, like the one on Thumper DRSSTC
ZRG,
The slider motor, and associated RAT technology, is an asset during the initial setup and tuning of the coil, because the sweet spot can be situated on a part of the primary coil only 5cm long. It may therefore be hard to find using "suck it and see". In this case, the sweet spot I refer to, is the tuning point where the primary current displays distinct notches. I would love to see it developed to the point where it can track different operating conditions. Thumper, also, has an affinity to playing the bass notes, a tendency that I think is caused by insufficient buss capacitance.
Russia very much appears to be the center of creativity these days, with both a DRSSTC Magnifier, and now a very seriously kick ass spiral toroid. The ability to be disassembled into a very compact unit during storage makes this toroid very attractive, apart from its aestetically very pleasing appearance.
Hats off to the Russkies!
Would you please expand on ways to determine the curvature and length of the individual segments of this toroid?
Registered Member #4762
Joined: Sun May 06 2012, 05:59PM
Location: Russia
Posts: 93
Finn Hammer wrote ...
Would you please expand on ways to determine the curvature and length of the individual segments of this toroid?
3D modelling in 3ds max and Pro/E (aka Creo Elements), then exported to CNC files and regular blueprints. It can automatically calculate all necessary data directly from the model.
By the way, the whole coil appears to be really steady and firm. Four of our team had to stand on the primary to erect the topload on the secondary top, and the coil didn't notice that at all
Registered Member #30656
Joined: Tue Jul 30 2013, 02:40AM
Location: UK
Posts: 208
Steve Conner wrote ...
Why can't it play high MIDI notes, what happens when you try?
I assume his midi controller limits the on-times of high notes to keep the duty cycle down. With a 10-15% detuning for peak streamer length it might not be able to breakout quick enough to form a decent streamer and pull the secondary into tune with the shorter on-times of the higher notes. I have notice similar behaviour myself when using significant detuning.
Registered Member #4762
Joined: Sun May 06 2012, 05:59PM
Location: Russia
Posts: 93
Thanks for the feedback. We're now planning to upgrade the bridge to lamitated bus and four single FZ600 bricks, since paired CM600's contact pads get overheated. Jet cutters promised to have it done by Friday.
Registered Member #30656
Joined: Tue Jul 30 2013, 02:40AM
Location: UK
Posts: 208
Steve Conner wrote ...
Surely to replace 2x CM600 in parallel you need a FZ1200?
They aren't in parallel, just two of the huge half bridge CM600 bricks to make the full bridge (see pics earlier). I'm assuming the output contact for each half bridge is getting too hot from the current density - I've noticed that this can be a limiting factor on big bricks, even single IGBTs (see for an example limited to 500A in a 600A+ class IGBT).
Registered Member #2694
Joined: Mon Feb 22 2010, 11:52PM
Location: Russia, Volgograd (Stalingrad).
Posts: 97
zrg wrote ...
Thanks for the feedback. We're now planning to upgrade the bridge to lamitated bus and four single FZ600 bricks, since paired CM600's contact pads get overheated. Jet cutters promised to have it done by Friday.
Hm.. Look like exactly what I say in (Dangerous Link! Cyrillic Font!)
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Modular-based large DRSSTC
I'm not surprised the 50mm2 cable gets hot though. Skin effect means that most of the copper in it does nothing. You would get better results with, say, 20 pieces of 2.5mm2 PVC insulated wire bundled together.
