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Registered Member #4074
Joined: Mon Aug 29 2011, 06:58AM
Location: Australia
Posts: 335
Just some anecdotal observations based on my old MOT exploits a few years ago:
- I have a video on Youtube where I abuse two 800W MOT's to near-destruction. I had the typical 4 MO capacitors to form a 1.1uF 4.2kV cap to get close to resonance. I measured 42A @ 230V on the input to the parallel primaries, and approx ~8.5-9kVA on the secondaries, deduced from the readings on my clamp meter. With no forced air cooling the transformers survived about 45 seconds of arcing (over a minute or more total time energised) before the weaker of the pair's secondary began smoking.
-I think your Mega-MOT could survive 10kVA for perhaps a minute with some forced air cooling, or perhaps 2-3 minutes if submerged in oil with a steel case. If you can get it operating at a decent power factor you might be able to reduce heat generation slightly and extend run times. You could maybe push it for longer, if you put some serious effort into cooling.
As a comparison, I recently picked up a small dry-type distribution transformer (I think I mentioned it recently, so I apologize for repeating myself). It's rated at 4.16kV (with taps up to ~4.5kV) and 15kVA. Since it's designed for continuous duty it's suitably massive: ~135kg and bolted to a small wooden pallet. Based on the DC resistance of the windings it could probably withstand 50kVA for a few moments :)
I can link the MOT video or upload pics of the big boys transformer if anyone was curious.
I'm not sure which version of the Turbochef i5 you have, but the Turbochef i5 has the following heating components:
- Two 3kW heater elements at 208VAC - Two microwave magnetrons
As others have pointed out, it's a 'hybrid' kind of oven. Given its nominal 10kW rating, this means the total microwave power is 4kW. This also means that in the (at least for the i5 I know) i5 each MOT is only rated for 2kVA. Given it's relatively compact size for your MOT (yes it's big, but if you compare it with say 4kW arc welders, you'll see it's not that all large at all) and the fact that this has to be running near an oven environment, I suspect it may just be a slightly over-engineered 2kVA transformer. You could probably push it to 4kVA for a short while though.
I've taken apart some other large single microwave ovens, such as a 1950W oven from long ago. That one weighed just about 9kg, or 19.8lbs, putting it in line with the MOT you have.
Regardless, that's still a much larger MOT than your usual 1kVA ones, so I'm sure you can build something great with it :) And still a good buy for $20.
Registered Member #31557
Joined: Tue Aug 06 2013, 02:38AM
Location:
Posts: 58
loneoceans wrote ...
I'm not sure which version of the Turbochef i5 you have, but the Turbochef i5 has the following heating components:
- Two 3kW heater elements at 208VAC - Two microwave magnetrons
As others have pointed out, it's a 'hybrid' kind of oven. Given its nominal 10kW rating, this means the total microwave power is 4kW. This means in the (at least for the i5 I know) i5 each MOT is only rated for 2kVA. Given it's relatively compact size for your MOT (yes it's big, but if you compare it with say 4kW arc welders, you'll see it's not that all large at all) and the fact that this has to be running near an oven environment, I suspect it may just be a slightly over-engineered 2kVA transformer. You could probably push it to 4kVA for a short while though.
I've taken apart some other large single microwave ovens, such as a 1950W oven from long ago. That one weighed just about 9kg, or 19.8lbs, putting it in line with the MOT you have.
Regardless, that's still a much larger MOT than your usual 1kVA ones, so I'm sure you can build someone great with it :) And still a good buy for $20.
Registered Member #54278
Joined: Sat Jan 17 2015, 04:42AM
Location: Amite, La.
Posts: 367
...just saw this post and my (jumped-to) conclusion was: NO WAY. But as I thought it over, and considering how MOT's are designed to work, I began to question my original thinking...not to the tune of 10kW continuously from this thing, but to the possibility of much more than I would (up 'till now) think. So...if you use (I realize some of this has been mentioned):
1) good PFC 2) some sort of cooling (MOT's are tough to cool even with a good fan--but with "3" below? ), perhaps under oil (great insulator!) 3) low (perhaps VERY low) duty cycle operation
You may approach 10kW--but a long way from continuously. Remember "Watts" can allow you to use big numbers--Energy "joules" is more 'honest'
Registered Member #11591
Joined: Wed Mar 20 2013, 08:20PM
Location: UK
Posts: 556
Signification wrote ...
...just saw this post and my (jumped-to) conclusion was: NO WAY. But as I thought it over, and considering how MOT's are designed to work, I began to question my original thinking...not to the tune of 10kW continuously from this thing, but to the possibility of much more than I would (up 'till now) think. So...if you use (I realize some of this has been mentioned):
1) good PFC 2) some sort of cooling (MOT's are tough to cool even with a good fan--but with "3" below? ), perhaps under oil (great insulator!) 3) low (perhaps VERY low) duty cycle operation
You may approach 10kW--but a long way from continuously. Remember "Watts" can allow you to use big numbers--Energy "joules" is more 'honest'
Yeah, joules over an hour, rather than a second would be much more useful, so long as it also states the duty cycle
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Just picked up a MONSTER 10kw MOT for $20
