Re: Gap Losses

From: 	DR.RESONANCE[SMTP:DR.RESONANCE-at-next-wave-dot-net]
Sent: 	Saturday, August 30, 1997 12:13 PM
To: 	Tesla List
Subject: 	Re: Gap Losses

To: Greg

We run at 150 kw and used a classic series inductor with a 1.2 Ohm
wire-wound resistor (air cooled) to help clip some of the peaks and prevent
core saturation. Inductor had many taps (every 10 turns) so we had a wide
range of adjustment.

Your project sounds very interesting and I look forward to meeting with you
this winter when I move to Tucson.


> From: Tesla List <tesla-at-pupman-dot-com>
> To: 'Tesla List' <tesla-at-poodle.pupman-dot-com>
> Subject: Re: Gap Losses
> Date: Friday,August 29,1997 10:30 PM
> From: 	Greg Leyh[SMTP:lod-at-pacbell-dot-net]
> Sent: 	Friday, August 29, 1997 1:11 PM
> To: 	Tesla List
> Subject: 	Re: Gap Losses
> > To: Greg
> > 
> > Most curious as to why you selected a direct current power supply (if I
> > reading you posts correctly)?  Won't direct current provide additional
> > quenching problems especially with the very high power level you are
> > running??
> No, if the resonant charging circuit is designed correctly.  As long as
> break rate does not exceed the maximum BPS rating of the resonant
> then the charging current in the reactor is _zero_ when the gap fires.
> Proper timing is essential in a DC resonant charger, but it's well worth 
> the effort IMO.  To use an analogy, DC resonant charging on a TC provides

> the same degree of control as fuel injection on an engine, compared to
> 'normally aspirated' method of using uncontrolled leakage inductance and 
> wallplug impedance in order to define the capacitor charging curve.  
> Given the uncontrolled charging waveform and current surges of standard
> AC charging methods it's no wonder that some coils, even small ones, will

> often disturb or damage the electronics in a coiler's house.
> How did you do the capacitor charging on your big 160kW job?
> -GL