Re: RFI isolation

Tesla List wrote:

> Original Poster: "Matt Behrend" <electronxlc-at-earthlink-dot-net>
> Dr. Resonance,
> I have built this motor controller so that I can use any DC or non-
> sync AC motors to run a sync RSG.  I am using a 1/6 HP simple
> AC motor.  The motor is switched on and off with a solid state
> relay.  An inductor is wired in series with the motor to eliminate
> jerking effects when the motor is rapidly pulsed.  The second great
> advantage to this system is absolute control of phase angle.  The
> phase can be adjusted from a distance while the coil is in operation
> instead of physically rotating the motor.
> Thank you all for your suggestions.  I have now fixed the problem
> and the controller is working perfectly so far on my lower power
> runs.  One of the data signals was picking up significantly more
> interference than the others.  I wired a 1.2k resistor to VCC and a
> 0.001 cap to VSS from the noisy data wire.  This has solved the
> problem so far.  If anyone else is having similar problems, you
> should try this.
> Matt Behrend
> > to: Matt
> >
> > If you are running a sync RSG you shouldn't be using a motor controller.
> > The motor should run at it's designed speed of either 1800 or 3600 RPM
> > depending on whether you are using the 2 or 4 electrode setup.  It is
> > called
> > a "synchronous" RSG because the motor should run at precisely one speed
> > in
> > direct sync with the 60 Hz line frequency.  You should not increase or
> > decrease the speed of the motor.
> >
> > You may be using the controller to rotate either the motor or the
> > electrode
> > assembly.  In this case why not just use a small DC motor with a few
> > diodes,
> > caps, and good old small 1-3 amp variac?  No interference problems.
> > Remember the K-I-S-S acronym??
> >
> > Happy coiling,
> >
> > Dr. Resonance
> >
> >


Sounds like a great controller!  Would you be willing to share the details of
the  circuit with those of us less engineering talent?

-- Dave Euans