On Thursday 18 June 2015 11:50:56 Erik Christiansen wrote: > On 18.06.15 11:03, Gene Heskett wrote: > > The isolation tranny has not arrived yet, thats 56 lbs crated & I've > > not piled all the motor psu stuff in one stack yet to see how big a > > box I'll need to build. Thats a monster toroid, and I'm of a mind to > > remove a few turns of the secondary as I expect 130 vdc is more than > > enough to smoke that 750 watt motor. > > Gene, one thing I've done to drop a toroid's voltage without having to > hack at the insulation, is to wind a dozen extra turns of insulated > wire through the core, and wind it to buck the secondary. That didn't > cover enough of the surface to keep a lot of heat in, and the increase > in I^^2R losses didn't amount to much. > > If your higher output beast runs too warm like that, then the > technique can at least serve for checking in advance how many turns to > remove. > > Just a thought. > > Erik
Before and after measurements, or just add 10 turns & figure from that voltage, how many you need to get what you need. I might throw on a 12 volt winding to run a spinx1 with, but Jons amp won't need the isolation. Another advantage. I have wound toroids before, which helps in the experience dept. But this will be scaled up in size by 50x... Cheers, Gene Heskett -- "There are four boxes to be used in defense of liberty: soap, ballot, jury, and ammo. Please use in that order." -Ed Howdershelt (Author) Genes Web page <http://geneslinuxbox.net:6309/gene> ------------------------------------------------------------------------------ _______________________________________________ Emc-users mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/emc-users
