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Forums
4hv.org :: Forums :: High Voltage
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mot bank hookup

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teslacoolguy
Thu May 01 2008, 01:38AM Print
teslacoolguy Registered Member #1107 Joined: Thu Nov 08 2007, 10:09PM
Location:
Posts: 792
today i got around to making my quad mot bank and i have one question. should i disconnect the one secondary wire from the core on the 2 mots that are going to be grounded
1209605702 1107 FT0 Mot
The 2nd mot that is in series with the 1st mot im already going to disconnect the hv lead from the core but i dont know if i should do it to the first mots and the whole setup is going into mineral oil when it is done.
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Ultra7
Thu May 01 2008, 03:42AM
Ultra7 Registered Member #1157 Joined: Thu Dec 06 2007, 12:11PM
Location: Houston, TX
Posts: 307
Why would you need to?
The way I figure it, you could just connect the 2 cores together with a piece of buss bar, and make that the ground/center tap.
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teslacoolguy
Thu May 01 2008, 04:12AM
teslacoolguy Registered Member #1107 Joined: Thu Nov 08 2007, 10:09PM
Location:
Posts: 792
ok so i will keep the wires connected to the core on the centertap and to connect the 2 mots in series i will disconnect it from the core.
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MOT_man
Fri May 02 2008, 07:46AM
MOT_man Registered Member #1127 Joined: Mon Nov 19 2007, 12:08AM
Location:
Posts: 139
The inner MOTs should be left unmodified while the outer pairs have the secondary - to - core lead disconnected and re soldered ... this keeps the outer cores floating. Keep the whole unit under transformer oil!!
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teslacoolguy
Fri May 02 2008, 11:44AM
teslacoolguy Registered Member #1107 Joined: Thu Nov 08 2007, 10:09PM
Location:
Posts: 792
Well it will be under mineral oil.
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MOT_man
Sat May 03 2008, 01:11AM
MOT_man Registered Member #1127 Joined: Mon Nov 19 2007, 12:08AM
Location:
Posts: 139
Good! That will work fine! Enjoy... play safe. I hope your running 240V 30A service... double pole
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teslacoolguy
Sat May 03 2008, 02:43AM
teslacoolguy Registered Member #1107 Joined: Thu Nov 08 2007, 10:09PM
Location:
Posts: 792
No im running of 120v but i have a 60 amp plug available.
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MRacerxdl
Sat May 03 2008, 02:52AM
MRacerxdl Registered Member #989 Joined: Sat Sept 08 2007, 02:15AM
Location: São Paulo, Brazil
Posts: 476
60A? If you want to play it without ballast I recomend you a 80A ou 100A plug.

Each MOT making arc on the secondary draws normally 20A. If you multiply that for 4, you have 80A.

So caution when you turn it up and try to draw some arcs.
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Alexandre
Sun May 04 2008, 01:30AM
Alexandre Registered Member #1228 Joined: Tue Jan 15 2008, 01:08AM
Location: Curitiba, Brazil
Posts: 162
The high current of the output MOT is letal angry
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quicksilver
Sun May 04 2008, 03:47PM
quicksilver Registered Member #1408 Joined: Fri Mar 21 2008, 03:49PM
Location: Oracle, AZ
Posts: 679
I'm just letting my imagination run here but the biggest impediment to using MOT's for some hobbyists is the danger associated with high current (and the lower overall lower voltage output of a single unit). Would it be possible to start with a source of lower current but higher voltage thus retaining a level of comparability to a NST if multiple MOTs were used?

My thought is an input from a disposable camera circuit; keeping the sub-30ma source, and creating a 2-300 volt input to the MOT bank...While I'm sure it's a given that the current will also affect an arc's appearance, (there would not be the same grippingly powerful 'flaming element" to the arc output) but would the use of a proportionately higher voltage (300 instead of the 120 mains) produce a useful effect? Could there be a substitution of useful effect of another source instead of household voltage & current?

And if this would be possible, - if not a disposable camera circuit, would another simple driver circuit be available?
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