On 6/1/11 8:16 AM, S&JY wrote:
Jay, A few MOT secondaries in series make a good charging reactor. You need many Henries of inductance. You will need a RSG running above 100 BPS to avoid trailing power arcs when the reactor saturates and acts mostly like a resistor. DeQing diode can be a string of 40 or more 1N5408 1 KV diodes in series. You should use the PT - it will be more robust and you won't need a ballast or a Terry filter. You can make a bridge rectifier with each leg having at least 30 1N5408s in series. This is the usual way to do a DC coil.
Note that without any power supply filtering there will be a superimposed 2*fLine modulation of voltage.
But if you want to build a much improved DC coil, add a second pair of stationary electrodes on your RSG. One gap charges your MMC, the rotor rotates a bit, then the other gap discharges the MMC into your coil primary, and the cycle repeats. This avoids the RSG trailing arcs, allows break rates as slow as you want, protects your DC supply since it is disconnected when the MMC discharges into your primary, and allows you to use a simple air core reactor of about 50 milliHenry.
I wonder if you could make a triggered gap version of this? _______________________________________________ Tesla mailing list Tesla@xxxxxxxxxx http://www.pupman.com/mailman/listinfo/tesla