[TCML] Effects of SRSG Dwell Time on Coil Performance

[Teslalabor]

Hi Gary,
of course I meant a cog belt ;) But if you only have access to 1500rpm 
motors, this would be a good possibility to achive 3000rpm.

Stefan

----- Original Message ----- 
From: "Gary Lau" <glau1024 at gmail.com>
To: "Tesla Coil Mailing List" <tesla at pupman.com>
Sent: Monday, September 27, 2010 2:09 PM
Subject: Re: [TCML] Effects of SRSG Dwell Time on Coil Performance


>I have only ever used a 3600RPM motor in both a propeller and small
> disk-based SRSG, but I haven't had any balance issues.  Granted the disk 
> was
> relatively small (6" x .09" thk).
>
> If the gap is to be synchronous, then using a belt drive is a bad idea,
> unless it is a cog belt that won't slip, but that's just adding an
> additional layer of complexity and offers no advantage as far as balance,
> economy, or simplicity.
>
> Regards, Gary Lau
> MA, USA
>
> On Mon, Sep 27, 2010 at 7:28 AM, Teslalabor <teslalabor at t-online.de> 
> wrote:
>
>> Hi John,
>> thank you for that explanation. I think I will have to try this. Just
>> replace the 3000rpm motor by 1500rpm, adding another 2 rotating 
>> electrodes
>> and see what happens. If there is no re-firing, the main advantage of
>> 1500rpm I can see is, that the mechanical balancing of the rotating disk 
>> or
>> the propeller in propellerdesign-gaps, is much easier done. BTW, another
>> idea is to use a 1500rpm motor in combination with a gearmeachanism or
>> simply a belt drive with a gear ratio 1:2 to achive 3000rpm. Think this
>> might work well.
>>
>> Stefan
>>
>> ----- Original Message ----- From: "Futuret" <futuret at aol.com>
>> To: <tesla at pupman.com>
>> Sent: Sunday, September 26, 2010 5:46 PM
>> Subject: Re: [TCML] Effects of SRSG Dwell Time on Coil Performance
>>
>>
>> Stefan,
>>
>> That's a good question.  A faster mechanical dwell time is generally
>> better.
>> There's an old myth that fast dwell time gives faster gap quenching.  In
>> reality
>> the quench-time depends more on output spark streamer loading.  But if 
>> the
>> mechanical dwell time is too long, a condition called "re-firing" of the
>> spark gap can occur, which results in very inefficient operation.  This
>> re-firing occurs when the capacitor is able to recharge to a sufficient
>> voltage to permit the cap to fire again while the electrodes are still
>> aligned
>> from the previous firing.  Many factors determine whether a gap will
>> re-fire such as; low rotary rpm, small rotary disc diameter, small
>> capacitor size,
>> wide electrode diameter, narrow electrode gap spacing, etc.  Usually
>> re-firing is
>> not a problem until the factors mentioned reach an extreme, or combine
>> to the extreme.
>>
>> Generally speaking, the faster 3000 rpm is preferable to the 1500 rpm.
>> That said, you'll usually see no difference in performance either way.
>> The 300 rpm might give a little more of a swirling air effect, and 
>> slightly
>> help the quenching that way.  Fast quenching is preferable, if it can
>> be achieved without increasing gap resistive losses.
>>
>> Cheers,
>> John
>>
>>
>>
>>
>>
>> -----Original Message-----
>> From: Teslalabor <teslalabor at t-online.de>
>> To: Tesla Coil Mailing List <tesla at pupman.com>
>> Sent: Sun, Sep 26, 2010 9:50 am
>> Subject: [TCML] Effects of SRSG Dwell Time on Coil Performance
>>
>>
>> Hi List,
>> I allready have built some nice SRSG's with very good results. All of my
>> SRSG's run with 200BPS. They use 2 rotating and 4 stationary electrodes.
>> They run with 3000rpm Motors (50Hz here in Germany).
>> I also own many 1500rpm sync.motors. So the question is:
>>
>> Let's say, there is some TC system with given parameters. It runs with
>> 200BPS.
>> Can somebody tell me, which effects in performance result in the 
>> different
>> dwell times, when using a 3000rpm Motor with 2 rotating and 4 stationary
>> electrodes OR use a 1500rpm Motor with 4 rotating and 4 stationary
>> electrodes?
>> In both cases there are 200BPS but the dwell time is different!
>>
>> Greets
>> Stefan
>>
>>
>>
>> _______________________________________________
>> Tesla mailing list
>> Tesla at pupman.com
>> http://www.pupman.com/mailman/listinfo/tesla
>> _______________________________________________
>> Tesla mailing list
>> Tesla at pupman.com
>> http://www.pupman.com/mailman/listinfo/tesla
>>
> _______________________________________________
> Tesla mailing list
> Tesla at pupman.com
> http://www.pupman.com/mailman/listinfo/tesla