Re: [TCML] Setting optimal phase angle of SRSG motor

[Futuret <futuret@xxxxxxx>]

Easiest way is to just pick up the RF from the coil on a scope with
an antenna.  It doesn't matter if you see the primary or secondary
voltage, both will show the level.  The absolute measurement is
not important, you just want to make the bangs equal in amplitude.
  
If I remember correctly, I was able to get equal bangs on my 240 bps
coil this way.  I think just listening to the sound worked pretty well,
but I dont' remember exactly how accurate the listening test was.
If the bang sizes are somewhat different, the coil sounds like 120 bps
(100 bps).  I guess the human ear tends to hear the loudest sound.
But when the bang sizes are equal or near equal, then you hear them
both and the pitch goes up.

There are other folks on the list that have done more work than I at
200bps (240bps), maybe they'll have some suggestions.  

Cheers,
John




 

 

-----Original Message-----
From: Teslalabor <teslalabor@xxxxxxxxxxx>
To: Tesla Coil Mailing List <tesla@xxxxxxxxxx>
Sent: Tue, Dec 7, 2010 2:43 pm
Subject: Re: [TCML] Setting optimal phase angle of SRSG motor


Hi John,



measuring the firing voltage would be great, but how can this be done?



Stefan



----- Original Message ----- 

From: "Futuret" <futuret@xxxxxxx>

To: <tesla@xxxxxxxxxx>

Sent: Tuesday, December 07, 2010 8:16 PM

Subject: Re: [TCML] Setting optimal phase angle of SRSG motor





Hi,



Sometimes you can tell somewhat by the sound.  When the two

firing points are somewhat balanced, the coil may sound more high-pitched.

If you have a scope, you can adjust the phase for two equal firing voltage

peaks in each 50Hz half-cycle.



Cheers,

John





















-----Original Message-----

From: Teslalabor <teslalabor@xxxxxxxxxxx>

To: Tesla Coil Mailing List <tesla@xxxxxxxxxx>

Sent: Tue, Dec 7, 2010 1:04 pm

Subject: [TCML] Setting optimal phase angle of SRSG motor





Hi,



I actually try to find out the optimal phase angle position of the motor in



my 200bps SRSG. I use a dummy load with halogen bulbs. I am not sure WHAT



exactly the optimal point is! Is it, when the 4 firing-sparks at the 4



electrodes seem to be of the equal "size" / brightness when variac is at



full voltage or when the bulbs are of highest brightness (but this is not



easy to see!) OR is it the point where all 4 electrodes begin firing at the



same time when rising the voltage on the variac? But in this case, 2 of the



4 electrodes seem to fire much brighter then the other 2, when variac at



full voltage. So I am a little bit confused, which point I should take.







Stefan







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