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PG13
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33
Corona leakage can be a big problem in high voltage circuitry since any sharp
point will lose quite a bit of power to the air. To cure this a manufacturer will
coat all possible leakage points with silicone RTV, since it is a good insulator
when dry.
Corona Motor
Now we can put this leakage to work for us. In fact NASA has put this to work
for them too, for pushing spacecraft around. When corona is coming off the end
of a sharp point, ions are coming off the point at a high rate of speed. Ions are
single units of electrical charge, like an atom with an additional electron, or an
atom with an electron removed. These ions close to the point will be at the
same charge potential as a sharp point that is emitting them. We all know that
like charges repel. Since the sharp point will be heavy, or even fixed, the free-
moving air ions are repelled away from the point.
Now if the point is able to move, we know from physics that for every action
there is an equal and opposite reaction. Therefore when the ions are repulsed
from the sharp point, the sharp point is also repulsed from the ions.
Corona motor 1, an easy one.
What you need:
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Piece of silly putty, gum, or even tape.
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A pin, all metal (no plastic pin heads allowed!)
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A 6 inch piece of thin solid wire.
What to do:
1. Turn off the power.
2. Affix the pin to the top electrode, so the pin point is facing upward. Make
sure it is mechanically sound.
3. Leaving the pin on the top as before, we are going to use this as our
“motor shaft”
4. Take your wire, measure to exactly 6 inches and cut.
5. Now measure your wire and mark the 3 inch point; this is our center of
gravity.
6. Bend the wire in half at the 3 inch point and back again to make a small
loop in the center of the wire. This loop will go over the pin.
7. Bend the last 1 inch of each end of the wire into an L shape, so your
“armature” looks like a Z.
8. Place the “armature” over the pin, and give it a quick spin test with your
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