On 16 July 2018 at 02:21, Dan Bloomquist <[email protected]> wrote: > <http://lakeweb.net/three_phase/>
Interesting. Many years ago (before I knew much about electronics, before the Arduino was invented and before I taught myself C in order to write 3-phase drivers for LinuxCNC) I made a voltage-doubling rotary converter that very nearly worked... The idea was to connect 240V single phase to one leg and the star-point of a three-phase motor and to then take 440V three-phase out of the ends of each leg. I found that I needed to spin the motor up with a single-phase motor initially, but that it would then continue spinning on its own. This was with no active control at all. It didn't produce particularly symmetrical 3-phase and would tend to bog down when a load motor came on line, so wasn't really a success, but did seem to have some promise. I wonder if this setup, with active control, could be made to work? While on the subject of voltage-increasing, apparently it is possible to re-wire the input stage of a 440V VFD into a doubler circuit to allow it to run (derated) off of 240V. https://en.wikipedia.org/wiki/Voltage_doubler#Delon_circuit -- atp "A motorcycle is a bicycle with a pandemonium attachment and is designed for the especial use of mechanical geniuses, daredevils and lunatics." — George Fitch, Atlanta Constitution Newspaper, 1916 ------------------------------------------------------------------------------ Check out the vibrant tech community on one of the world's most engaging tech sites, Slashdot.org! http://sdm.link/slashdot _______________________________________________ Emc-users mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/emc-users
