Re: [TCML] rsg pulsing

["John Forcina" <forcijo10@xxxxxxxxx>]

Yes the motor is fully adjustable via a industrial dc motor controller.  I
tried slowing it down but after decreasing the speed about 15% the spark
length decreased dramatically.  The spacing of the electrodes is pretty
normal so i do not think that is a problem.  Also the disk has 8 electrodes
so 1800rpm is 240bps.  I want to try slowing it up to 120bps but it seems
that it puts everything way out of tune.

On Wed, Sep 17, 2008 at 9:52 PM, <futuret@xxxxxxx> wrote:

> Usually pulsing is caused by a sync gap which isn't
> actually running in sync.  If the 1800 rpm DC motor is
> not electronically controlled and synched and phased
> to the power line, it will pulse like that.  What I'm
> saying is that the 1800 rpm motor might not be
> running at exactly 1800 rpm.  Usually the pulsing
> will be more extreme at 120 bps however.
> The lack of PFC would not cause the problem.
>
> If the spacing of the gap electrodes is somewhat
> wide, it will make the pulsing worse most likely.
>
> If you're able to control the motor speed, try
> slowing it some or speeding it up, and the pulsing
> should disappear.  Then it won't be running as
> a sync gap of course, but as an async gap.
>
> John-
> ------------
>
>
>
> -----Original Message-----
> From: John Forcina <forcijo10@xxxxxxxxx>
> To: Tesla Coil Mailing List <tesla@xxxxxxxxxx>
> Sent: Wed, 17 Sep 2008 9:14 pm
> Subject: [TCML] rsg pulsing
>
>
>
> Ok tonight i took my big coil out for a run since i havent really got a
> chance to tune it yet.  I noticed that as soon as i got it to 30% or higher
> on the variac the spark gap and coil started pulsing really bad. it would
> shoot 6' streamers for about 1/2 second and then stop for about 1/2 second.
> The rsg is a dc 1800rpm 240bps.  I still have no pfc so that may be a
> problem.  Anyway why is this doing this?  Any tips or suggestions would be
> greatly appreciated.
> _______________________________________________
> Tesla mailing list
> Tesla@xxxxxxxxxxxxxx
> http://www.pupman.com/mailman/listinfo/tesla
>
> _______________________________________________
> Tesla mailing list
> Tesla@xxxxxxxxxxxxxx
> http://www.pupman.com/mailman/listinfo/tesla
>
_______________________________________________
Tesla mailing list
Tesla@xxxxxxxxxxxxxx
http://www.pupman.com/mailman/listinfo/tesla