On Fri, 2011-12-30 at 16:33 -0500, Jim Coleman wrote: > how stable the voltage remains across a range of loads
I really didn't measure that, but I think the core losses are just this side of terrible. After all, they used core saturation for output power control, so reducing losses probably wasn't particularly important. Some handwaving: It pushed 280 A into a 14 m-ohm load with 4.1 V at the lugs, which made the winding + terminal resistance 3 to 4 m-ohm. That's higher than I expected for four parallel #10 wires: 1 m-ohm/ft x 4 ft = 4 m-ohm each, so you'd expect 1 m-ohm total. Frankly, my measurement accuracy isn't up to the task and I'm ignoring core losses. Putting three of those #10 wires in series, rather than parallel, would give 15 V with maybe 10 m-ohm. You pull 75 A for 1 kW at 13.5 V, so the voltage would drop a bit under 1 V due to copper resistance. Add or subtract a turn or two for the right answer. It might come heartbreakingly close to working. > any reason this technique couldn't be used for higher voltages The original secondary had a bazillion turns of fine wire to stuff what, 4 kV or so into the magnetron. The catch would be winding the heavy wire you need at 1 V/turn: a dozen or so turns would be do-able, but much beyond that won't fit through the core windows. You could, I suppose, delaminate the transformer and start all over again, but that starts to resemble actual work. Also, the recycled Romex wire I used is, mmmm, suboptimal in a high-current transformer. I'm not sure you (well, I) could feed enamel (or whatever they use these days) insulation through the core windows without nicking it; the thick plastic insulation on that Romex gave me decent results with crude techniques. But, again, it'd probably come pretty close to working... -- Ed http://softsolder.com ------------------------------------------------------------------------------ Ridiculously easy VDI. With Citrix VDI-in-a-Box, you don't need a complex infrastructure or vast IT resources to deliver seamless, secure access to virtual desktops. With this all-in-one solution, easily deploy virtual desktops for less than the cost of PCs and save 60% on VDI infrastructure costs. Try it free! http://p.sf.net/sfu/Citrix-VDIinabox _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
