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RE: 200bps even firing was RE: [TCML] Setting optimal phase angle of SRSGmotor
Hello,
You set the VAMPL parameter to the peak volts (10Kv * 1.414). The TD
parameter is the timing in mSecs after the mains has crossed zero where the
firing point will occur. By substituting your own parameters for the
winding resistance and inductance value, along with the cap value, you can,
by tweaking the TD parameter get even firing voltages.
Richie also includes the 'trace expressions' that you enter into the graph
screen to show the PF and average power etc.
Regards
Phil
www.hvtesla.com
-----Original Message-----
From: tesla-bounces@xxxxxxxxxx [mailto:tesla-bounces@xxxxxxxxxx] On Behalf
Of Teslalabor
Sent: 08 December 2010 09:52
To: Tesla Coil Mailing List
Subject: Re: 200bps even firing was RE: [TCML] Setting optimal phase angle
of SRSGmotor
Hi phil,
in Richie's simulation, what voltage must be used? My coil is fed with 10kV
from PT's, so have I use 10kV in the simulation or the peak voltage
10kV*1,41 = 14,1kV ? My tank cap is 25kV rated, the safety spark gap is set
to 22kV and doesn't fire. The simulation tells me that I get 18kV equal bang
size, when typing in 14,1kV.
Stefan
----- Original Message -----
From: "Phil Tuck" <phil@xxxxxxxxxxx>
To: "'Tesla Coil Mailing List'" <tesla@xxxxxxxxxx>
Sent: Tuesday, December 07, 2010 10:24 PM
Subject: 200bps even firing was RE: [TCML] Setting optimal phase angle of
SRSGmotor
> Gary et al
> You can get even firing with 200bps. Richie B has a PSpice simulation
> you can download and my own spice trace (using his downloads) can be
> seen here http://www.hvtesla.com/phase.html 2nd picture down.
>
> You normally can hear a change in sound. At 200 bps you have a slight
> rasp to the sound which disappears when it is in sync. (Got it on a
> YouTube video somewhere where you can clearly hear it - no idea which
> one though)
>
> I would love to have 100bps as it sounds better, but based solely on
> PSpice simulations it seems with power over 5kw you need some caps
> that can take some high voltage peaks of 50Kv or more, unless your
> very, very careful when adjusting the phase. Using an MMC is just not
> practicable at this size and peak voltage handling. 200 bps keeps the
> peak voltages down and my 100nF 34Kv MMC handles it nicely and the
> 0.36 inch safety never fires (input 12Kv
> pig)
>
> Regards
> Phil
>
> www.hvtesla.com
>
>
> -----Original Message-----
> From: tesla-bounces@xxxxxxxxxx [mailto:tesla-bounces@xxxxxxxxxx] On
> Behalf Of Gary Lau
> Sent: 07 December 2010 19:42
> To: Tesla Coil Mailing List
> Subject: Re: [TCML] Setting optimal phase angle of SRSG motor
>
> 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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>> Tesla@xxxxxxxxxx
>> http://www.pupman.com/mailman/listinfo/tesla
>>
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