Re: SRSG options

["Kelly & Phillipa Williams" <kellyw-at-xxxxxxxxxx> (by way of Terry Fritz <twftesla-at-xxxxxxxxxx>)]

Hi Brad,

Here is a web page of someone who has done exactly that, he has a lot of
complicated digital
controller circuitry to make an unmodified asynchronous DC or AC motor run
synchronously AND allowing fine adjustment of the phase angle while the coil
is running. He provides schematics of everything.

http://home.earthlink-dot-net/~electronxlc/construct/RSGcontroller.html

A quote from that page:

 "My motor controller is designed to use a DC or AC motor to drive a
synchronous rotary spark gap. A synchronous RSG only fires at specific
points on the AC waveform that charges the tank capacitor. Mine is
configured to allow maximum energy bursts by firing at every peak of the
charging waveform which is 120 times per second (for 60Hz AC line).

        Usually, synchronous RSG's are built using a synchronous AC motor,
which runs at a specific speed corresponding to the AC frequency. The phase
of gap firing is adjusted by rotating the motor body so the shaft is at the
correct angle to fire during the peaks of the sine wave. However, my digital
motor controller allows easy and fine adjustment of phase angle from a safe
distance while the Tesla coil is in operation. "  Matt Behrend

Regards,

Alan Williams


> I was talking to a friend of mine before i started milling flats in my
> motor, and he mentioned another option that may or not work. Actually i
> know it will work, i just don't know if it will operate properly under
> these conditions.  He was talking about using a dc motor to spin the
> disk with 4 electrodes.  On one end of the shaft there will be the disk
> with the electrodes, on the other there will be another disc, smaller,
> and it will trigger a proximity switch.  If you can reference from the
> AC line coming in, you can make a circuit to make the dc motor run in
> sync with the AC phase.  Also we talked about the possibility of making
> a control board which will let you see if it is in phase and also let
> your retard or increase the timing, instead of doing it manually by
> actually moving the motor.  I think this will be an excellent
> alternative because you can control everything from a pannel and not
> even have to shut down the system to adjust the phase of your srsg.  The
> only problem i can see is the strong emf that is created by the coil.
> Since my gap will be in a cabinet under the coil, i was wondering if the
> actual running of the coil will wreak havok with any parts on the
> control unit.  It is possible to have all control circutis outside of
> the cabinet except for the proximity sensor, which i think will take the
> most abuse if any of the components are going to be affected by the
> emf.  So pretty much my question is,  will a control board hold up so
> near to a coil, or will i have to isolate all of the circuits and use
> fiberoptics to reference where the disk is and how fast it is spinning?
> I can get all the parts no problem, probobally even for free, but if the
> fiber optics are needed, it will get a bit pricey.......
> Let me know what you think of the idea, even if you are not even sure
> about the effects!
> Thanks a lot!!
> Brad DiGiovine
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