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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
> >
> >
Matt,
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