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

[Gary Lau <glau1024@xxxxxxxxx>]

I assume that your electrodes are equally spaced, 90 degrees apart.
I'm not sure that it's possible to get all bangs the same size at 200BPS by
adusting just the motor phase, without some very deliberate electrode
geometry considerations.  The trouble is, the rate at which the cap charges
is non-linear with respect to time.  So instead of the fixed electrodes
being at 12, 3, 6, and 9 o'clock, they may need to be at 12, 2, 6, and 8
o'clock (picking numbers out of the air).  I think it was Finn Hammer who
posted that he did some PSpice simulations to determine the necessary
electrode placement for 200BPS.  I would guess that whatever geometry worked
for Finn would work for you, if he was willing to share.

Just curious - why 200 rather than 100 BPS?

Regards, Gary Lau
MA, USA



On Tue, Dec 7, 2010 at 12:19 PM, Teslalabor <teslalabor@xxxxxxxxxxx> wrote:

> 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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