Re: Microwave Oven Transformers (MOTs)

To: tesla-at-pupman-dot-com
Subject: Re: Microwave Oven Transformers (MOTs)
From: "Gregory R. Hunter" <ghunter-at-accucomm-dot-net> (by way of Terry Fritz <twftesla-at-uswest-dot-net>)
Date: Mon, 01 May 2000 16:33:42 -0600
Approved: twftesla-at-uswest-dot-net
Delivered-To: fixup-tesla-at-pupman-dot-com-at-fixme

Gavin & Weazle,

I disagree.  I don't think the physical or electrical differences between
the two MOTs will make much difference if the primaries are wired
antiparallel and the secondaries in series with the cores grounded.  The
MOTs will be practically independent of each other in such a setup anyway.
If the MOTs were still inside ovens, and both ovens were plugged into the
same mains branch and running at the same time, would that concern you?  Of
course not.  I think it would be a pretty harmless experiment just to try
it.  The MOT with the lowest secondary current rating will clamp both MOTs
to it's own current maximum.  The voltage output might not be perfectly
symetrical with respect to ground.  So what?

My $.02 worth.

Greg

At 12:01 AM 05/01/2000 -0600, you wrote:
>Original Poster: "J. B. Weazle McCreath" <weazle-at-hurontel.on.ca> 
>
>
>At 04:18 PM 29/04/00 -0600, you wrote:
>
>>Original Poster: "Gavin Dingley" <gavin.dingley-at-astra.ukf-dot-net> 
>>
>>Hi again,
>
>>thanks for your help, I have a yet more questions, but I shall insert them
>>into the original message.
>>
>>If two transformers are of differing physical dimensions, does that mean
>>that their electrical characteristics are different?  I mean would such
>>a physical difference be down to alloys used for the transformer core etc.
>>
>>The two transformers I have are as follows:
>>
>>Gardener GR129264, it's fairly big.
>>
>>Dong Yang Power Systems Y6245NTC
>>
>>thanks again.
>>
>>Regards, Gavin, U.K.
>>
>Hello Gavin:
>
>Based on the little bit I do know about transformers, if the physical size
>difference between the two is significant, then the electrical properties
>are likely to be different too.
>
>This could mean differences in turns ratios, turns per volt, wire size,
>and so on.  I think you'll be better off to look for two identical units
>rather than risking the two you have, and possibly yourself.
>
>Check around at appliance dealers and scrap yards, and you should come
>up with two (or more) identical units in no time.
>
>
>73, Weazle, VE3EAR/VE3WZL
>
>Listening: 147.030+ and 442.075+
>E-mail:    weazle-at-hurontel.on.ca
>           or ve3ear-at-rac.ca
>Web site:  www.hurontel.on.ca/~weazle
>
>
>
>