On 8/19/12 1:14 PM, David Speck wrote:
Jim,
All of the VFDs that I have worked with have three phase outputs. Unless
you are driving a three phase transformer, I do not expect that one
would work well, if at all. I have had industrial synchronous motor
drivers (which are a sort of sophisticated VFD) fail catastrophically
when one of the three output phase leads became disconnected from the
motor.
Yes.. but a synchronous drive is probably different from a VFD
designed to drive a induction motor.. the "broken wire" is pretty
common, so I can't imagine a commercial drive that would fail
catastrophically in that situation. Shut down, sure.
You might need a ballast/flywheel of some sort on the drive (i.e. an
inexpensive 3 phase motor on the drive, and you hook your TC on one of
hte phases.
They also DO make 1 phase and 2 phase VFDs for driving PSC motors, for
instance.
In any event, VFDs are packed with sensitive internal electronics,
intended for driving relatively quiet (electrically speaking) three
phase motors. TCs are electrically very noisy devices, with large
spikes coming back into the line through the power transformers. I
would not expect an ordinary VFD to last long in TC duty, even if you
can get it to work.
I think someone on the list has actually tried running a VFD into a TC
of sorts.
Better be sure you can afford to pay full retail for the loaner VFD if
you happen to let all the magic smoke out of it.
Most of the musical coils that I've encountered are of the solid state
drive versions. You could use your current secondary, and probably your
toroid, but the SSTCs I've seen usually have smaller, more closely
coupled primaries than typical disruptive TCs. Many have only a single
turn primary.
If you really want musical output, heading in this direction is probably
going to be the easiest path to what you want.
Easternvoltageresearch.com is one seller which offers proven kits of
SSTC driver boards in various configurations. (no connection to seller)
I would agree.. if the goal is music, the SSTC is the way to go.
Dave
On 8/19/2012 2:14 PM, Jim wrote:
Yes sir it is a static spark gap.
I will see if the electrical supply house will loan me a 540 watt vfd.
Thanks.
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