On Sat Mar 03 23:08:39 PST 2018 Lee Hart said: >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?
This is an older generator head from a military diesel genset. It did have controls to adjust the voltage and the frequency, but I haven't dug into the actual generator head in detail yet. >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. Figuring out the inductor size might be a bit difficult, but hopefully not TOO critical. I'm unlikely to need more than about 30KW out of this continuously. >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. Thanks, I was hoping there would be some kind of possibility to do that. >Lee Hart, 814 8th Ave N, Sartell MN 56377, www.sunrise-ev.com And also thanks for giving the ONLY useful answer that didn't boil down to "go buy a 30KW 3 phase hi-voltage charger". -- Try my Sensible Email package! https://sourceforge.net/projects/sensibleemail/ _______________________________________________ UNSUBSCRIBE: http://www.evdl.org/help/index.html#usub http://lists.evdl.org/listinfo.cgi/ev-evdl.org Please discuss EV drag racing at NEDRA (http://groups.yahoo.com/group/NEDRA)
