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Re: MOT core
Original poster: "Richard W." <potluckutk-at-comcast-dot-net>
Hi Ken,
Actually you'll need more copper to handle the additional VA.
Rick W
Salt Lake City
----- Original Message -----
From: Tesla list <tesla-at-pupman-dot-com>
To: <tesla-at-pupman-dot-com>
Sent: Tuesday, February 03, 2004 5:45 AM
Subject: Re: MOT core
> Original poster: "Crow Leader" <tesla-at-lists.symmetric-dot-net>
>
> I think I'm interpreting something wrong here.
>
> Say I have two transformers, each has a core cross sectional area of
1"sq.,
> and each is rated 39VA. Together than can handle 78VA.
>
> Now if I strip the windings off, and put the cores next to each other
giving
> me a cross section of 2" sq. (pretending and generic EI core set) and put
> the wire back on, (I connected the wires from each transformer to make for
> the extra winding circumference) do I now have a transformer capable of
> 156VA, AND have leftover copper from the rewind? This sounds too good to
be
> true. What's the difference between the single and parallel tranformer
> situations?
>
> KEN
>
> ----- Original Message -----
> From: "Tesla list" <tesla-at-pupman-dot-com>
> To: <tesla-at-pupman-dot-com>
> Sent: Monday, February 02, 2004 8:58 AM
> Subject: Re: MOT core
>
>
> > Original poster: "Richard W." <potluckutk-at-comcast-dot-net>
> >
> > Actually decreasing the core cross-section by half will drop the power
> > capability almost by a factor of 4.
> >
> > Let's say we have a core who's center leg measures 1" x 2" for 2 square
> > inches.
> >
> > CS = 2 sq.in. (Cross Section)
> >
> > VA = (CS/0.16)^2
> > VA = (2/0.16)^2
> > VA = 12.5^2
> > VA = 156
> >
> > Cutting the core in half = 1 sq.in.
> >
> > VA = (CS/0.16)^2
> > VA = (1/0.16)^2
> > VA = 6.25^2
> > VA = 39
> >
> > Rick W
> > Salt Lake City
> >
> > ----- Original Message -----
> > From: Tesla list <tesla-at-pupman-dot-com>
> > To: <tesla-at-pupman-dot-com>
> > Sent: Sunday, February 01, 2004 7:34 PM
> > Subject: Re: MOT core
> >
> >
> > > Original poster: "Hydrogen18" <hydrogen18-at-hydrogen18-dot-com>
> > >
> > > The only thing I know to say here is stack the cores. Alternatively
you
> > > could use very small wire for the secondary to achieve the HV
output.
> > > Stacking the cores(inserting 1 E into each end of the "bobbins")
will
> > halve
> > > your power output but double your winding window.
> > > ----- Original Message -----
> > > From: "Tesla list" <tesla-at-pupman-dot-com>
> > > To: <tesla-at-pupman-dot-com>
> > > Sent: Sunday, February 01, 2004 6:49 PM
> > > Subject: MOT core
> > >
> > >
> > > > Original poster: "Dan" <pbursa-at-cfl.rr-dot-com>
> > > >
> > > > Hello !
> > > > I am curious if someone here has experience with rewinding
microwave
> > > > transformer.
> > > > I cut of the I part of the core, removed old windings and split
the
> E
> > core
> > > > in half so now I have two identical E cores .
> > > > Together they make 5.5 inches long, 4.15 wide and 1.35 thick core
> with
> > > > about 1.72 square inches area...
> > > > This looks like I'll need over 400 turns on primary... this would
> > require
> > > > 40000 turns for 12KV secondary and there is not enough space for
> this,
> > I'm
> > > > afraid.
> > > > My question is - if I use less primary windings (say 150 - 200),
how
> it
> > > > affect performance, core saturation, ...
> > > > I noticed that original MOTs primary was also less than proper
> amount
> > of
> > > turns.
> > > > Also, since MOT core is welded together, how the weld affect the
> core
> > > > losses and eddy currents? isn't the very purpose of using
laminated
> > core
> > > to
> > > > minimize these loses ?
> > > > How about potting finished transformer in oil ?
> > > > Thank you in advance
> > > > Vladan
> > > >
> > > >
> > > >
> > >
> > >
> >
> >
> >
>
>