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4hv.org :: Forums :: High Voltage
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rewound xformer

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Sam
Sat Mar 25 2006, 10:36PM
Sam Registered Member #227 Joined: Mon Feb 20 2006, 10:47PM
Location: Cambridge Ontario, Canada!!
Posts: 127
well guys I have ripped apart my other 2 MOTs and I have 2 cores that are Identical. Can I make a double "E" core?
the link for my pictures Link2
what will happen if I use both 120 primaries in the same core? I was told I'm gonna over saturate it.
as for the wire I'm getting a big roll of 33gauge.
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dan
Sat Mar 25 2006, 11:28PM
dan Registered Member #223 Joined: Mon Feb 20 2006, 06:42PM
Location: Ottawa, Ontario, Canada
Posts: 125
Well since you have two identical primaries you could make a nice 1-2KVA isolation transformer. You could use the double 'E' core this would give you even more room for windings/insulation.. If you really want to make your own transformer I would suggest using the double 'E' with the primary in the middle and two new secondaries on ether side using the core as a center tap. However I don't know why you are bent on winding your own.. I mean two mots in series gives 4KV and it's possible to do more..

I wouldn't use both primaries at once since you wouldn't get any gain from it.. If you connect both in series you are decressing the V/turn ratio, so less Vout. And if you parallel them you are gong to cut the primary inductance in half causing double the current drawn from mains.
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Sam
Sun Mar 26 2006, 03:00AM
Sam Registered Member #227 Joined: Mon Feb 20 2006, 10:47PM
Location: Cambridge Ontario, Canada!!
Posts: 127
so it would go: E primary secondary primary E (other way) and tie the primaries in series?
just take a look at my drawing
1143342001 227 FT5439 Ee

the blue is the secondary and the red is the primaries

Oh and something cool: I'm getting 2 identical MOTs from a friend, brand new for about $2 CND each! But its like $12 in shipping.
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dan
Sun Mar 26 2006, 03:36AM
dan Registered Member #223 Joined: Mon Feb 20 2006, 06:42PM
Location: Ottawa, Ontario, Canada
Posts: 125
Like that but it would only have one primary and two secondaries.. so it would go secondary-primary-secondary. both secondaries would be connected in series with the center point connected to the core. Or Just have one big secondary and one primary. If you use both primaries in series you are decressing the V/turn ratio; so you get half the Vout for a given Vin.
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GimpyJoe
Sun Mar 26 2006, 03:51AM
GimpyJoe Registered Member #316 Joined: Mon Mar 13 2006, 01:30PM
Location: Marietta, GA
Posts: 212
Maybe you could use both cores next to each other to make a really wide core and wind your own primary and secondary. With such a large cross-section you could put some serious power through it.
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Reaching
Sun Mar 26 2006, 02:33PM
Reaching Registered Member #76 Joined: Thu Feb 09 2006, 10:04AM
Location: Hemer, Germany
Posts: 458
i already wound some high voltage transformers, but never used a mot. the window i too small to get high enough voltages. you have to know that these transformers are very "Hard". they will put some 1000s of watts in short circuit (ie draw an arc) if you use this thin wire then it will burn up within seconds.i dont think its possible
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Sam
Sun Mar 26 2006, 04:23PM
Sam Registered Member #227 Joined: Mon Feb 20 2006, 10:47PM
Location: Cambridge Ontario, Canada!!
Posts: 127
Well I guess no HV transformer, The second thing I wanted to do was to make a large isolation transformer to put in my variac case. maybe I'll make two. Now I have 3 cores ripped apart and I'm getting 2 new MOTs.
what guage wire would be right? 20-22?
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Marko
Sun Mar 26 2006, 05:44PM
Marko Registered Member #89 Joined: Thu Feb 09 2006, 02:40PM
Location: Zadar, Croatia
Posts: 3145
For isolation transformer just use two primaries you have + you can wind few low voltage windings if you wish.

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cjk2
Sun Mar 26 2006, 06:21PM
cjk2 Registered Member #51 Joined: Thu Feb 09 2006, 04:17AM
Location:
Posts: 263
There is a thread on the old board about an isolation transformer I built out of mots. All I did was cut appart a MOT and replace its secondary with another MOT primary. I dont use the transformer any more though, because it was too big and heavy for my use.
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Sam
Sun Mar 26 2006, 10:32PM
Sam Registered Member #227 Joined: Mon Feb 20 2006, 10:47PM
Location: Cambridge Ontario, Canada!!
Posts: 127
Well, I want to get the most power I can If I build an ISO. So when I rewind It I should: have the same gauge wire for primary and secondary(s), and have the same number of turns for each winding? is this right?

how many turns should I have on each? The 3 primaries I have are all different, one is beat to hell, the other is in great shape and the third is to big for the double "E" core.
How many watts can I expect? 1 or 2 Kw?
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