Re: [TCML] Coil Conversion Project.

[Jim Lux <jimlux@xxxxxxxxxxxxx>]

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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