Small, slow AC machines: surface to volume ratio?
- From: DGoncz@xxxxxxx
- Date: Sat, 25 Jun 2005 08:35:10 +0000 (UTC)
In recent threads in sci.electronics.design, rec.crafts.metalworking,
and sci.physics, I have written about my attempt to convert Burden's
Surplus Center #10-1134 motor into a pedal powered self-excited
induction generator (SEIG). The consensus is it won't work, and I am
getting ready to dispose of the evidence. :)
There are many reasons it won't work. The one I understand the best is
that when R, the winding DC resistance plus certain AC resistance
components, is greater than the square root of L*C, where L is the
winding inductance including the effect of the rotor, and C is an
auxiliary capacitor across the windings to achieve self-excitation,
then the resonant "tank" circuit has no impedance hump, and therefore Q
= 1.
I was wondering if this is a surface to volume ratio effect. That is, R
comes from the cross sectional *area* of the wire selected, and L comes
from the turns, in a three dimensional *volume* selected, of individual
wires. Small objects have a higher surface to volume ratio, in general,
than larger ones, so for a specific design at some scale factor, R >
sqrt(L*C).
Also, I speculate room temperature superconductors might allow small,
slow self-excited induction generators with minimal R, and was
wondering if anyone here agrees or disagrees with that speculation.
The motor is:
http://surpluscenter.com/item.asp?UID=2005062415255748&catname=&qty=1&item=10-1134
The threads are:
http://groups-beta.google.com/groups?q=author:DGoncz@+generator&start=0&scoring=d&hl=en&lr=&ie=ISO-8859-1&num=10&;
Yours,
Doug Goncz
Replikon Research
Falls Church, VA 22044-0394
.
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