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4hv.org :: Forums :: High Voltage
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Mot Stack-Current limiting

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Micha0_0
Mon Jul 26 2010, 03:00PM Print
Micha0_0 Registered Member #2990 Joined: Mon Jul 12 2010, 11:22AM
Location:
Posts: 40
hey guys...

I build an 2x motstack an it runs very well (10-15cm. arcs)
I run it on Phase 1 and N from the 400 volt line ,because there is a 16 amp safety device

but the mot stack draws too much current and i´ve to limit it

i know i can use an mot with short circuit secondary in series to the mot stack
but i just have an mot without an secondary winding, so i tested it (in series to the stack) and i just have an 5mm arc (is it too much limited?)
or must the mot have an secondary which is short circuited?


i heard about limiting it with lightbulbes
how is this done ?
just some lightbulbes in series to the mot stack´s primary ?

Sry for my bad english :D

greet micha
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dmg
Mon Jul 26 2010, 03:05PM
dmg Registered Member #2628 Joined: Fri Jan 15 2010, 12:23AM
Location:
Posts: 627
let me understand better, your feeding a mot 400V?
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Micha0_0
Mon Jul 26 2010, 03:14PM
Micha0_0 Registered Member #2990 Joined: Mon Jul 12 2010, 11:22AM
Location:
Posts: 40
no i just use phase 1 and N so it is 230V an 16 amp instead of the normal 230V line which just has 12 amp
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Dr. Dark Current
Mon Jul 26 2010, 05:32PM
Dr. Dark Current Registered Member #152 Joined: Sun Feb 12 2006, 03:36PM
Location: Czech Rep.
Posts: 3384
saw off the "I" part of the core and include a gap while you assemble it back. You can control output current by changing the width of the gap.
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Micha0_0
Mon Jul 26 2010, 07:02PM
Micha0_0 Registered Member #2990 Joined: Mon Jul 12 2010, 11:22AM
Location:
Posts: 40
i´ve found an old ring-core
i wind 104 turns 1,5mm² wire on it
i´ll test it tomorrow,if it works
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HVPaul
Mon Jul 26 2010, 08:28PM
HVPaul Registered Member #2321 Joined: Fri Aug 28 2009, 05:13PM
Location: Boston, MA
Posts: 34
Would current limiting using a 250 watt incandescent bulb in series be effective?
I'd imagine you could stack them in parallel to allow more current.
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Micha0_0
Mon Jul 26 2010, 08:35PM
Micha0_0 Registered Member #2990 Joined: Mon Jul 12 2010, 11:22AM
Location:
Posts: 40
i´ll test it with some 100W bulbes in series or paralell
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radiotech
Mon Jul 26 2010, 08:53PM
radiotech Registered Member #2463 Joined: Wed Nov 11 2009, 03:49AM
Location:
Posts: 1546
Just make sure the lightbulbs are the same voltage as the system voltage, ie 230 volts. They can pop violently if overvolted.
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Micha0_0
Mon Jul 26 2010, 09:13PM
Micha0_0 Registered Member #2990 Joined: Mon Jul 12 2010, 11:22AM
Location:
Posts: 40
im from austria ...so everything is rated to 230volts ;)

is it more limited when i put some bulbs in series or some in paralell
(and in series to the stack)
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cedric
Tue Jul 27 2010, 08:13AM
cedric Registered Member #2941 Joined: Fri Jun 25 2010, 08:08AM
Location:
Posts: 143
what about some tl ballast in parallel or a hdi one ?
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