Tim,
I have never used a motor that small, but I suppose a small disc may have
some advantages in your case, as the smaller the swing radius of the
electrodes from the shaft the easier the motor will find it to rotate. (mine
is 10 inch on a 2HP - playing safe after troubles in the past)
Different power levels will require slightly different phase settings, so
best to have some adjustment. I always get the disc positioned initially
during the build stage, by using an infra-red sensor and put a duel channel
scope on the output, mains freq on one trace, sensor on the other. I then
move the disc so that the revolving electrodes initially break the beam just
before the mains peak ***. Then once it's set in this initial position I fix
the motor and use the Fraeu controller circuit to fine tune during runs.
John's circuit allows precise positioning then.
http://www.youtube.com/watch?v=drqmBnwETAU
*** Setting up to break the beam as the initial starting position just
before the mains peak, is fine for 200bps BUT may not be suited for your own
respective bps rate - whatever that is. (I use Pspice to determine the
optimum point for a particular bps rate beforehand) With a 200bps the
eventual optimum position is actually after the mains peak (around 5 to 10mS
or so, roughly, and will be dependent on cap size and charging current) I
then use John's circuit to move it to optimum during the run.
Phil,
-----Original Message-----
From: tesla-bounces@xxxxxxxxxx [mailto:tesla-bounces@xxxxxxxxxx] On Behalf
Of Tim Flood
Sent: Wednesday, November 06, 2013 6:23 PM
To: tesla@xxxxxxxxxx
Subject: Re: [TCML] Disc Dia.
Thanks to Phil And David for posting.
I do check the archives frequently, but don't always find what I'm looking
for in the time available.
Phil: The motor I have is a 1/12 HP synchronous motor that turns this small
rotor with power to spare. I plan on using four rotating electrodes and one
pair of stationary electrodes, one front and one lined up in back opposite
each other.
Some posts in the archives do mention that even a synchronous motor should
be mounted in an adjustable cradle for phase adjustment. Any thoughts?
I too thought my coil building days were behind me until my coil died. This
one was built back in the 90's. The dead coil was used for demonstrations,
before it's untimely death. Now I'm scrambling to put something decent
together.
Tim
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