Re: Microwave Oven Transformers (MOTs)

• To: tesla-at-pupman-dot-com
• Subject: Re: Microwave Oven Transformers (MOTs)
• From: "Gavin Dingley" <gavin.dingley-at-astra.ukf-dot-net> (by way of Terry Fritz <twftesla-at-uswest-dot-net>)
• Date: Sat, 29 Apr 2000 16:18:16 -0600
• Approved: twftesla-at-uswest-dot-net
• Delivered-To: fixup-tesla-at-pupman-dot-com-at-fixme

Hi again,
thanks for you help, I have a yet more questions, but I shall insert them
into the
original message.

Tesla List wrote:

> Original Poster: "J. B. Weazle McCreath" <weazle-at-hurontel.on.ca>
>
> At 07:29 AM 28/04/00 -0600, you wrote:
> >O.K., two questions:
> >
> >Actually, I have two different MOTs, one is higher in power than the other,
> >does this pose a problem?  Or is it because the winding directions of the
> >coils may be different, making phasing difficult to know?  If it is the
> >latter, is there a way of finding out the phasing?  Does it matter if I get
> >the phasing wrong, will it destroy the MOTs?
> >
>
> My first thoughts on this are that it probably would be better if the
> two MOT's where the same.  Not neccessarily the same manufacturer but
> at least the same voltage and current ratings.
>
>

If two transformers are of differing physical dimensions, does that mean that
there 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.

the other,

Dong Yang Power Systems Y6245NTC, I found their web sit, but my Japanese
was not
up to it!



>
> >If you connect together the secondary leads of an MOT, does this not turn
> >the transformer into a resistance?  The magnetic field in the core
> >generated by the primary would induce a current in the secondary, which in
> >turn induces an opposing field back into the core.  If this is so, then
> the >device is no longer an inductor as it is unable to store energy in the
> form >of a magnetic field.  If this is the case, all you are left with is
> the DC >resistance of the primary coil?  Or am I wrong?
> >

> You've got me on that one.  I'm no transformer expert, but I think that
> even with the secondary shorted there is still inductance in the
> primary, which will limit the current to your MOTs.  I do know
> that it does work, as others have reported so.
>

Well, that's all that counts, thanks again.


>
> >
> >Regards,
> >
> >Gavin, U.K.
> >
>
> 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

Regards,

Gavin

• Prev: Re: vacuum spark gap
• Next: Ignition coil abuse
• Index(es):
  • Main
  • Thread