[TCML] PFC Question (again)
bartb at classictesla.com
Wed May 28 19:02:48 MDT 2008
Yes, I agree. My ballast toroidal core is slotted. This was certainly
needed and something I did 10 years ago. It's a 28A Powerstat, but it's
easy to go beyond it's capabilities even with a slotted core. These
days, I just have a feel for it more than anything else. Kind of why I
would like to build a homemade ballast similar to Richie's which is
capable of 40A.
> In one test I ran a PT powered 600 watt ballasted 120 bps coil. Using
> my homemade ballast the coil drew 600 watts, but using a 20 amp
> variac as a ballast, the coil drew 1200 watts. That's when Dr. Resonance
> suggested cutting a slot in the variac to prevent saturation of the core.
> I think with STR operation the slotting may not quite as important? It
> may be very important at 120 bps. (I'm not sure if every 120 bps coil will
> behave the same in this sense.) Slotting seemed to be very much needed
> because only a few turns of the variac were needed at 120 bps.
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