Re: RFI isolation

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