Re: SRSG motor power

["Barton B. Anderson" <tesla123-at-pacbell-dot-net> (by way of Terry Fritz <twftesla-at-uswest-dot-net>)]

Hi Gomez, welcome back to the List! (it hasn't been that long, has it?), 

Your design sounds just fine to me. My SRSG is identical in every aspect except
it can house anywhere from 2 to 12 electrodes and my electrodes are 0.375"
diameter. Works great! I can't say if the larger rotating electrode mass will
over-strain structural integrity, but you will be runnning at a pretty low
speed of ratation in the SRSG mode and I would guess it will be fine. Hopefully
someone can confirm this. The 1HP motor is plenty. I'm using a 1/3HP motor and
have no problems of it rolling out of sync (it comes into sync in about a
second and stays there). 

Are you planning on building a crattle or stationary adjustment for the SRSG? I
would recommend it as you will want to adjust this at some point. I am in the
process of building a stationary electrode adjustment myself and wish I would
have done this to begin with. 

Take care (and again, welcome back!), 
Bart 
  
  

Tesla list wrote: 
>
> Original poster: "Gomez ADDams" <gomez-at-netherworld-dot-com> 
>
>  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. 
>
> ............................................................... 
> "How many cares one loses when one decides not to be something, 
> But to be SOMEONE."  - Coco Chanel