[Prev][Next][Index][Thread]
Multi-layered Secondary
----------
From: Jim Lux [SMTP:jimlux-at-earthlink-dot-net]
Sent: Monday, March 23, 1998 10:32 AM
To: Tesla List
Subject: Re: Multi-layered Secondary
> ----------
> From: Alfred C. Erpel [SMTP:aerpel-at-op-dot-net]
> Sent: Sunday, March 22, 1998 7:03 PM
> To: Tesla List
> Subject: RE: Multi-layered Secondary
>
> >
> > Hi Ed,
> > Just getting to old list mail !!
> > Try cutting open a video monitor flyback with a bandsaw - you will
> > find the sectioned stacked wiring you suggest below.
> > Dale
> >
> > ....snip follows
> >
> > "Another thought - it is possible to imagine a multi-layer coil layered
> > the 'other way', effectively a stack of concentric spirals going
> > alternately in and out, e.g. for 3 layers,the turn numbers being
> > something like :
> >
> > | |
> > 987| |789
> > 456| |654
> > 321|_|123
> >
> > It would however require a lot of ingenuity to figure out how to
> > actually wind such a beast - any takers?
>
>
> What you are trying to do is essentially stack pancake coils in series
> that have been manufactured out of one continuous wire.
>>>...
> Regards,
> Alfred Erpel
The "resonance transformer" 1+ MeV x-ray sources developed at GE by
Charlton in the 30's used just such a coil. A series of 125 air core
pancake windings were connected in series and resonanted at 180 Hz. The 180
Hz was generated by a clever saturating transformer running from the 3
phase 60 Hz supply. The spacing of the pancakes was not uniform, by the
way. The total L was calculated at around 15,000 H and the C was 50 pF. The
system developed 55 mA peak secondary current at 1000 kVp (i.e. 55 kW). The
losses in the system ranged from around 1 kW at 1 MV output to about 4 kW
at 2 MV (i.e. as the square of the voltage/current). The load current was 3
mA.
The system was in a steel tank with Freon 12 at 60 psig for insulation. The
entire system (a portable Xray generator) was 3 ft in diameter, 4 ft high
and weighed about 1500 lb. A 20 cfm blower circulated the gas when running
at 1.25 MV.
This data was taken from Craggs & Meek, "HV Laboratory Technique"