Re: [CAD_CAM_EDM_DRO] 3 Phase rotary converters

I am running a rather large motor (10 Hp) and decided
that the easiest way to start it was to mount a 1/2 hp
motor and belt connect it to the rotary convertor. To
start, I turn on the 110v 1/2 hp motor and tighten the
sliping belt with a handle on the idler pulley. This only
takes a few seconds. When the rotary motor comes
up to speed, I release the handle and the belt slips.
then I switch on the single phase power to rotary convertor
and it goes on its merry way. No high starting current, or
prolonged waits for the convetor to come up to speed.
I just have the run capacitors to the third leg. I could deal
with the mechanical starte a lot easier than going thru all
design and experimentation. I use it to run a 300 amp MIG
welder which will never see close to that output, but it was
dirt cheap and in excellent condition. I also have a 17" lathe
that can use either a static or rotary convertor, and a 10 grinder.
So if you have a small electric service to your shop and don't
want to dim the lights while starting the convertor, there is an
alternative.

Does anybody know for sure about the voltage rating of capacitors?
I read someplace that the voltage printed on the capacitors is not
the voltage that they should be operated at on a rotary convertor.
A capacitor for a 220 VAC rotary convertor should have approx
370 volts printed on its case. ???????

Bob McKnight