Re: Summing up of Async Vs. Sync

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

Original poster: "Jason Petrou by way of Terry Fritz <twftesla-at-qwest-dot-net>" <jasonp-at-btinternet-dot-com>

Malcom,
Right, thankyou - thats exactly what I wanted to know. It allows
flexibility, so that it can 'process' larger energies more easily...
obviously :) Dont worry, im just  dumb british guy!!!

Jason
----- Original Message -----
From: "Tesla list" <tesla-at-pupman-dot-com>
To: <tesla-at-pupman-dot-com>
Sent: Friday, June 22, 2001 2:51 PM
Subject: Re: Summing up of Async Vs. Sync


> Original poster: "Malcolm Watts by way of Terry Fritz
<twftesla-at-qwest-dot-net>" <m.j.watts-at-massey.ac.nz>
>
> Hi Jason,
>
> On 21 Jun 01, at 18:27, Tesla list wrote:
>
> > Original poster: "Jason Petrou by way of Terry Fritz
> <twftesla-at-qwest-dot-net>" <jasonp-at-btinternet-dot-com>
> >
> > Hi List,
> >
> > Right... from the numerous replies that I have got heres my impression
of
> > the uses of the two different types of gap:
> >
> > Sync seems to be the most logical type of gap. (Assuming UK 50Hz) A
3000RPM
> > motor with 2 contacts will give 100BPS, at the same time as the AC
peaks,
> > which is logical. This way the caps will discharge as the peaks occur,
which
> > is good, because it is the most efficient. It is also not going to allow
the
> > caps to overcharge, and is better for a (very delicate) NST.
> >
> > Async gaps allow you to vary the BPS. Since caps will charge and
discharge
> > at the rate of the AC lne, then surely a Sync gap that is syncronised
with
> > the AC line is the best option. I do not see why you would want to vary
the
> > BPS when the charge rate of the caps can only occur at the AC line peaks
and
> > dips. Surely the most logical option is to discharge the caps when they
> > peak, to get the maximum power through the primary, i.e. using a sync
gap!!!
> >
> > Really confused here
> > Jason
>
> Firstly, a word about rotary gaps: A rotary gap will fire any time
> its contacts are close enough to allow it to fire, *not necessarily
> or even usually _when the contacts are aligned_*. Async gaps can take
> advantage of this by allowing firings with a wide range of cap
> energies. The results all end up traversing a hot air channel
> beginning at the secondary terminal.
>      A coil built for a gap with a low rep rate (read 120BPS for
> example) and for a specified power level (say 10kW) is going to have
> to process much larger primary bangs for that throughput than a gap
> running twice as fast or faster. That is going to have some influence
> on secondary design, and height in particular since primary energy is
> intimately related to output voltage. You could expect to have to
> build a taller secondary to handle the slower breakrate for a given
> throughput.
>
> Regards,
> Malcolm
>
>
>