RE: Hard Drive Motors, RSGs and Stuff

["sundog" <sundog-at-timeship-dot-net> (by way of Terry Fritz <twftesla-at-uswest-dot-net>)]

Hi Troy, all

What the rotary gap will do for you is let you charge the caps up as normal,
but instead of firing at the breakdown voltage of a static gap (which
decreases as it heats up), it forces it to fire at a specified time.  So
that means you get a more consistant bang, and a higher breakrate (400+ BPS,
depending on your rotary), whereas a static gap fires "when it can."
  The difference between the sync and async is that the sync gap puts the
electrodes close (so it can fire) at the peaks of every AC cycle.  It also
locks to the mains AC waveform, so it is always in sync.  This requires
grinding on the armature of the AC motor for sync (Salient Pole Operation is
the tech-y term for it), but that is fairly easy to do.  Then you have to
adjust your rotating electrodes so they're lined up at the peak of the AC
cycle.  (that is the fun part!)  Sync gaps are needed on NST's, and OBITS,
which can't take the pounding of an async gap.
 An async gap is just that.  it fires when the electrodes come close
(providing the cap is charged), and let you change the breakrate as it's
running.

Now, to answer about the HDD motor...they don't have the torque needed for
good reliable operation with a heavy disc (useful to maintain a steady
breakrate), but more against them is that they're xsistor driven.  The
sparkgap is a primary radiator of the "Evil Interference", and xsistors
don't like the strong EM fields generated around the gap.  It induces
current in the wires.  Not too awful for a 1/3HP AC motor, but a definate
Bad Thing(tm) for 5v sillycon parts.

Driving the tranny more than 60hz.... I dunno.  My $.02 unfortunately
deosn't know xformers.

  Hope it helped some!
								Sundog
PS considered an MMC?




-----Original Message-----
From: Tesla list [mailto:tesla-at-pupman-dot-com]
Sent: Monday, July 17, 2000 2:21 PM
To: tesla-at-pupman-dot-com
Subject: Hard Drive Motors, RSGs and Stuff


Original poster: "Troy Peterson" <highvoltage-at-mad.scientist-dot-com>

Hi all,

It's been a while since I've posted to this list, but coiling has been good
for
me. While I am still looking for a solution to my capacitor problem (Bottles
are too lossy and big for my coil, but thats all I have...) Some other
questions have finnally gotten the better of me. Firstly, what exactly is
the
diference between a syncronise RSG and an Asyncronous RSG. I have an idea:
it
has to do with firing, a sync gap always fires on the peaks or something,
but
please elaborate.
Also, how do you guys think a hard drive motor would work for a RSG? The
motor
I am referring to is a stepper motor that runs on 12volts, very compact,
consisting 10cm outer disk for mounting and a rotating cylinder in the
middle
of this, the whole thing is about 3m long. If the specs for a typical hard
drive are to be believed, these motors are capable of atleast 3600 RPM.
    My next question is of line frequency, just a point of curiosity, what
would happen if the primary xformer was driven with 120VAC at a much higher
frequency like 400Hz, I don't plan to try this, just curious.

I think thats all for now,
Regards, Troy Peterson [VE7SOK]
<mailto:highvoltage-at-mad.scientist-dot-com>highvoltage-at-mad.scientist-dot-com