John Lussmyer via EV wrote:
So, I happen to have an older 3 phase, 60KW generator head.
I also have a small car engine with all the pollution controls.
My battery pack is fully charged at 332VDC.
I'm trying to figure out if there is some way to use this generator as a range
extender.
While driving my PFC-50 would help some, that's only 12KW.
Would a "bad boy" full wave 3 phase rectifier work? (I'd probably need to
adjust the voltage output of the generator.)
Is it possible to build a voltage regulator that adjusts the voltage QUICKLY in
order to get something closer to a square wave output rather than the normal
sine wave?
If the genset is old, it probably doesn't have any elaborate electronic
controls to regulate voltage and frequency. Does it just have some kind
of simple mechanical or electrical governer to set the ICE speed, and
thus the output frequency?
And, how does it set the output voltage? One ones are likely to have
some kind of field winding on the generator that gets adjusted to set
the output voltage.
If the above is the case, then it would be pretty simple to make a
high-power charger. You basically need a big 3-phase bridge to turn the
AC output into DC.
Then, I would include a large series inductor to smooth the output
current and knock down the peaks. The inductor's resistance will also
limit the current into a discharged battery. This will also make the
generator run cooler by improving the power factor it sees.
If you want to fully regulate the output voltage and current, three of
the diodes in the bridge could be replaced with SCRs, and phase
controlled. Copy a classic circuit from an SCR manual, or use your
favorite microcontroller and program it yourself.
--
You never change things by fighting the existing reality. To change
something, build a new model that makes the existing model obsolete.
-- R. Buckminster Fuller
--
Lee Hart, 814 8th Ave N, Sartell MN 56377, www.sunrise-ev.com
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