Re: new MOT stack completed!

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

Original poster: "colin.heath4 by way of Terry Fritz <twftesla-at-qwest-dot-net>" <colin.heath4-at-ntlworld-dot-com>

hi
    i know what you mean about rotary putting through less power
im running a tamed mot supply as per greg hunters page iv just got my rotary
running and the spark output is longer than with my tcbor gap but a lot
thinner in appearance
cheers
colin heath
----- Original Message -----
From: Tesla list <tesla-at-pupman-dot-com>
To: <tesla-at-pupman-dot-com>
Sent: Thursday, March 28, 2002 3:03 PM
Subject: Re: new MOT stack completed!


> Original poster: "tesla by way of Terry Fritz <twftesla-at-qwest-dot-net>"
<tesla-at-paradise-dot-net.nz>
>
> Greetings.
> No problems with more data and opinions
>
> I'm a MOT fan cos they work a treat for nearly nothing.
> 1) None of my MOTs are the same. (but they are similar) and I doubt it
> matter too much.
> 2) I selected them for big core size and high O/P volts.
> 3) The outer MOT's are selected for core to secondary insulation spacing
> 4) I mains ballast with big inductors from 50v rectifier sets as used by
> telcos. It's not critical but saturation needs to be watched.
> 5) PFC needed to keep the mains I/P current down. Standard Motor run caps
> are good. Not actually calculated reqd Cpfc but 100uF helps a lot
> 6) Coils is very standard 15deg pancake about 8T to tune. Sec is 12" dia
54"
> of double spaced 22g. Resonates with toroids at 90kHz
> 7) Toroids are big 12" by 48" and 6" by 30" (biggest O/P is actually with
> only the small toroid, time to check and tune may change this)
> 8) 300bps SRSG goes OK (90deg and 90+/-25deg firing) but runs more power
and
> bigger sparks with a multi pipe gap. Cp is 90nF MMC CD942C 1600v/0.33uF as
> per Robin Copini
> 9) I take the MOT HT lead off its eth connection and terminate on a
tagstrip
> then plug that area with hot glue for stability and insulation.
> 10) A big variac is a good idea
> 11) I'm currently looking at running each half of the MOT stack (two
groups
> 3 phased around eth) from separate mains feeds and variacs so I can more
> easily achieve the required I/P current from the mains supply) Need to
> ensure each is off separate feed from the switch board
>
> It's all simplicity and common sense, any questions feel free to ask
>
> Best
> Ted L in NZ
> > >Hi Ted and Tim
> > >
> > >I think you both should provide complete details about the tesla coils
> and
> > >power supplies. The expense of 5 or 10 kVA pole pigs has prevented many
> > >coilers from ascending to pole pig heaven. The six pack MOT power
supply
> > >would allow more coilers to enter the power club. If full details of
your
> > >systems were made available, this could set the precedent for some
> reliable
> > >standards. One problem is the infinite variety of MOTs. I have about 50
> > >MOTs and no two are identical in appearance. I think I remember Gregory
> > >Hunter writing that he had two MOTs which were identical in appearance,
> but
> > >had different output characteristics. This variety alone might stand in
> the
> > >way of reliable standards.
> > >
> > >Godfrey Loudner
> > -----------------------------------------------------------------------
> >
> > In my experience, no one MOT has exactly the same output characteristics
> as
> > the other! I had a 2337 VAC MOT, and a 2400 VAC MOT working together
just
> > fine on the same curcuit in series for my older Tesla Coil. I never had
> any
> > problems. But they drew around the same amount of current (9 to 10 A
max).
> I
> > THINK CURRENT INPUT/OUTPUT/ and CORE SIZE IS THE ISSUE HERE...NOT
VOLTAGE.
> > So...look for Microwave with similar brand name or current draw. (the
> bigger
> > the current draw...the bigger the the core size--usually)
> >
> >
> >
> >
>
>
>