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Re: Best break-rates, was: additional transformers [rolled caps]
From: FutureT-at-aol-dot-com[SMTP:FutureT-at-aol-dot-com]
Sent: Friday, August 08, 1997 4:12 AM
To: tesla-at-pupman-dot-com
Subject: Re: Best break-rates, was: additional transformers [rolled caps]
In a message dated 97-08-07 08:45:31 EDT, you write:
>snip>
<< I just wanted to say in reference to your 360 BPS suggestion that I
> have personally found ~ 402.5 BPS (14 stud rotary wheel on a 1725 RPM
> non-synchronous motor) to be really sweet. A wheel with 12 studs
> yielding ~345 BPS was significantly less impressive in my MTC unit, all
> things else being identically equal. I guess there is an ion channel
>lifetime effect difference happening here that is better at the
> slightly higher break rate of 400, but suspect a supply sinewave
>filling factor or synchronizing benefit also as the break pulses 'walk'
through
> the 60 cycle mains phase in a slightly more concentrated manner.
> The Twin system which I have recently built really comes alive in
> this 400 PPS regieme, and is noticeably less remarkable at slower
> rates, including attempts to set the non-sync DC rotary break motor
> to run synchronously at 120 BPS (due to large wheel inertia and
> variac control I can successfully ride the crest of the sinewave peaks for
a few
> seconds at a time). I subsequently have no intention to operate the
> Twin at 120 BPS synchronous, nor any need to operate it's break rate
> exceeding 402 PPS.
> rwstephens >>
Robert,
I've been pondering this break rate issue on my coils also. I wonder
if it is possible that the particular toroid size that you used was
"demanding" the extra power available at the slightly higher break-rate?
If this is the case, then the use of a slightly larger tank cap should
compensate for the lower break-rate and give good performance also,
provided that quenching remains good, etc. My point is that there
might not be any thing "special" about a break rate of 402.5, rather
your coil may simply be demanding the particular amount of power
provided by that break rate. A different coil may demand a different
break rate? This is all speculation on my part.
I do agree that the sine-wave filling factor may be helping as
you said, at certain break-rates.
John Freau