Neal,
Shorting the filament lead is just icing on the cake. Probably
insignificant electrically, except to those of us with OCD.
The primaries would definitely be connected in parallel. As far as the
secondaries are concerned, you could connect them in parallel for double
the current, or in series for double the voltage.
If you bond the frames of the transformers together, you can consider
the two transformers to be equivalent to a single center tapped
transformer with the connected frames being the center tap, something
near ground potential. At peak voltage, you would have +2,200 volts to
the center tap at one HV terminal, and -2,200 volts to the center tap at
the other HV terminal, or a total of 4,400 volts total across the two HV
output terminals of the stack.
You can drive out the magnetic shunt laminations located in the gaps
between the primary and secondary coils for a little higher output
current with either arrangement.
Dave
On 11/28/2013 10:25 AM, Neal Namowicz wrote:
> Hi Dave and all,
>
> Thanks for the suggestions, but just a little clarification, please.
>
> First, re: the current limiter, I did have the secondary shorted, but
> I didn't realize I should short the filament winding also. Which would
> be more effective, shorting the winding or removing it if possible?
> (Looking at it, it's probably going to be simpler to short it, anyway)
> Next the issue of the other 2 mots. I did phase them, so that part's
> taken care of. However, if I set them up as you say, wouldn't I just
> be doubling the current output while the voltage remains the same?
> We don't have to get into the DC resonant charging issue now, but I
> may have some questions about that another time.
>
> Thanks again for your help,
>
> Neal.
>
> -----Original Message----- From: David Speck
> Sent: Wednesday, November 27, 2013 4:58 PM
> To: Tesla Coil Mailing List
> Subject: Re: [TCML] DC Coil progress and MOT configuration
>
> Neal,
>
> Best approach would be to connect the two core ends of the series MOTs
> together, and take the high voltage off the two opposite HV terminals.
> That puts the least voltage stress on the secondary:core interface.
>
> You do have to phase the two series MOTs so their outputs are additive,
> or else you will get no output.
>
> For the transformer you are using as a current limiter, you have to
> short the HV winding (and optionally the filament winding, if still
> present), or else you will get relatively little current passing
> through it.
>
> If you are just using the setup to draw arcs, then the current limiter
> is a good idea. If you are using it to charge a resonant charging DC
> TC, then you would not want the current limiter transformer in the
> circuit.
>
> Dave
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