all i ment by a constant rpm was that if a machine is designed to charge a 12V battery , for example ,the average machine will become inefficient at charging the 12V battery at a higher rpm , because at double the cutin speed the current will also be double .If your stator can handle twice the current , you're ok..
AS far as the "circuit" is concerned , i was just happy that it worked well in simulation, and it did show the principle of pulse width modulation , which is, the average current can be controlled by varying the width of the pulse of the current going through the battery.
on a side note , i gave the power source the expected internal resistance of one phase of my #10 ga. coils (six coils = 0.05313ohms ) .(of 38 turns)more on that later
i havent finished testing it out yet , but i'm getting some interesting results.
let me give y'all peek at what i'm doing
below is what some might call a dead short , but in reality has resistance.
It is a 6.6" piece of #20 gauge wire soldered across the coil leads..
http://www.otherpower.com/images/scimages/2965/IM001612.JPG 67KB
it has a resistance of 0.0054996 ohms
the coil itself has a resistance of 0.005063 ohms, thats 24 turns of #10 wire a tad over five feet.
scope data.
Vp div RPM rpm / Vp average rpm / Vp
.2 7 71 rpm 355 333
.4 4 125 312
.6 2.5 200 333
the Rpm per Volts( peak ) is a little high but that can be corrected by using 38 turns instead of 24.
the interesting part is that i got a voltage at all !!
V/R = I and R = coil Resistance + load resistance = 0.01056 ohms
so at 200 RPM .6 / .01056
57Amps (peak value)
the rms value is 40 Amps
needless to say the load gets pretty hot , and the enamel is breaking down
http://www.otherpower.com/images/scimages/2965/IM001614.JPG 97KB