RE: srsg idea to prevent losses

["Tesla list" <tesla-at-pupman-dot-com>]

Original poster: "Loudner, Godfrey by way of Terry Fritz <twftesla-at-qwest-dot-net>" <gloudner-at-SINTE.EDU>

Hello Terry

The brushing electrode would create a tunnel behind itself as it moved in
the oil. It could be a problem if the tunnel did not refill with oil before
the arrival of the next brushing electrode. Also the turbulence created by
the brushing electrodes might interfere with the refilling of the tunnels
with oil. I'm no expert in fluid dynamics.  

Godfrey Loudner 

> -----Original Message-----
> From:	Tesla list [SMTP:tesla-at-pupman-dot-com]
> Sent:	Thursday, March 21, 2002 12:22 AM
> To:	tesla-at-pupman-dot-com
> Subject:	RE: srsg idea to prevent losses
> 
> Original poster: "Terry Fritz" <twftesla-at-qwest-dot-net>
> 
> Hi Gary,
> 
> Both of my coils have just about zero quenching :-))  They conduct until
> the current is just gone...  The big coil does loose a little due to
> primary to secondary "sloshing" but the small coil is designed to expend
> all of it's power to the streamer during the first notch.  There is
> nothing
> left to slosh back to the primary.  It has lower Q and all to do that,but
> it seems to work very well.  Solid state spark gaps can provide "perfect"
> switching too like the proposed contact gap.  Of course,they can also open
> back up to microsecond accuracy...
> 
> The idea of submersing a contact type gap in oil is intriguing.  Maybe
> putting it all in on heck of a vacuum too...  But the heat dissipation in
> the gap and motor would be about zero in a vacuum...
> 
> Much to ponder...
> 
> Cheers,
> 
> 	Terry
> 
> 
> At 03:42 PM 3/20/2002 -0500, you wrote:
> >Actually, it IS necessary to have a spark as the conductor in a spark
> gap.  
> >It has to do with quenching, or when the gap stops conducting.  In a
> spark 
> >gap, conduction ceases at one of the primary notches, when all of the 
> >primary energy has been transferred to the secondary side.  A spark
> "knows" 
> >when to stop conducting by virtue of the gap current, when it reaches a 
> >minimum.  A mechanical contact's on-duration is dictated strictly by the 
> >mechanics of the design and it would be nearly impossible to design it so
> 
> >that the switch opens with microsecond accuracy just at a primary notch.
> If 
> >the on-time was too long, the energy would slosh back and forth between
> the 
> >primary and secondary, wasting energy in the gap and other loss
> mechanisms.
> >
> >Of course, the fact that the contacts will arc in the "normal" fashion
> well 
> >in advance of mechanical closure means that the above is purely academic.
> 
> >Also, rotary contacts spinning at 1800 or 3600 RPM with zero clearance 
> >between them will guarantee an electrode crash.
> >
> >Regards, Gary Lau
> >MA, USA
> >
> > -----Original Message-----
> >From: 	Tesla list [mailto:tesla-at-pupman-dot-com] 
> >Sent:	Wednesday, March 20, 2002 2:55 PM
> >To:	tesla-at-pupman-dot-com
> >Subject:	Re: srsg idea to prevent losses
> >
> >Original poster: "Terry Fritz" <twftesla-at-qwest-dot-net>
> >
> >Hi Colin,
> >
> >Since the voltage across the gaps is high, they will tend to arc over
> about
> >1/4 inch before the contacts actually touch.  Depending on the speed of
> the
> >electrodes, the firing process my be all finished by the time the
> contacts
> >actually do touch.  Maybe like 0.0003 second.  Even a fast 3600 RPM gap
> >will only move the electrodes 6.5 degrees in that short time.  So I think
> >early firing from high voltage arcover will be a big problem.  However,
> it
> >really can't hurt and may be better anyway as far as losses go.  The
> actual
> >"spark" in the gap is totally unneeded and only wastes power.  The
> problem
> >is it is hard to get rid of ;-)
> >
> >Cheers,
> >
> >	Terry
> >
> >
> >At 04:09 PM 3/20/2002 +0000, you wrote: 
> >>hi all,
> >>        im concidering an idea with my rotary gap and would like to run
> it 
> >>by you all
> >>now it could be totally stupid or it could work
> >>let me know what you think
> >> 
> >>im going to run my gap without spark gap but instead have the rotor 
> >>electrodes touch a spring loaded contact so it brushes by it when
> running
> >>i have achieved the actual building of this unit but just wondered
> whether 
> >>it needs to spark to work
> >> 
> >>i was hoping this would reduce losses in the spark
> >>i am a newbie to all this only 4 months and have two coils my best
> putting 
> >>out 4'
> >> 
> >>please let me knoew what you think of this idea
> >>many thanks 
> >>colin haeth
> >> 
> >>
> >
> >
> >
> >
>