SRSG motor power

["Gomez ADDams" <gomez-at-netherworld-dot-com> (by way of Terry Fritz <twftesla-at-uswest-dot-net>)]

 I am in the process of building a massive multiple-series SRSG for my next
big coil project. (24" secondary, ~24kW in)

 I haven't been able to come up with much information for calculating the
"wind" loading of the rotor, or the recommended motor starting torque for a
given mass/moment arm.

 So I'd like some advice or empirical data from anyone who has built a gap
with a rotor similar in construction to mine:

    rotor material: G-10
    rotor dimensions: 12" x 0.5"
    rotor mass: ~ uh, heavy
    electrode material: 60% tungsten 40% copper sintered "alloy"
    electrode dia. of rotation: 10.5" (I think- it's not in front of me)
    electrode dimensions: 0.5" x 1.5"
    electrode mass: ~1.5 pounds total (for 8 electrodes)

 This design has 4 stationary electrodes on each of two stators, so can be
wired for 2 - 8 gaps in series if warranted.

 I have a 1HP 1800 rpm motor that I'm thinking of converting to salient pole
operation, but I want to be sure it's beefy enough to do the job without
overheating.  I'm aware that considerable torque capability is lost after
converting a squirrel cage motor to salient pole by removing pole material.

thanks in advance,
- Bill Lemieux
(aka Gomez in some circles)

PS: I have only recently returned to this list after a very long hiatus of
several years.  I think I can handle the list traffic better now, and I'm
sure I can use all the advice I can get on what is likely to be my last
large coil.  It's good to be back in the thick of things.


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