Re: Looking for motor

To: tesla-at-pupman-dot-com
Subject: Re: Looking for motor
From: pmathus-at-learningco-dot-com (by way of Terry Fritz <twftesla-at-uswest-dot-net>)
Date: Thu, 07 Oct 1999 07:58:19 -0600
Approved: twftesla-at-uswest-dot-net
Delivered-To: fixup-tesla-at-pupman-dot-com-at-fixme

     Why don't you make a little gear/chain reduction system so the 
     motorspindle is running at 10k rpm but the rotor only spins at 1800 
     rpm.  That should give you serious torque.  
     
     it makes sense that the motor would be developing far less power than 
     it's rating if you're feeding it less juice.  running it flat out and 
     gearing down would give you even more torque than if you were spinning 
     the rotor at a full 10k rpm.
     
     also:
     
     One resource for surplus and new motors, as well as all manner of 
     other useful mechanical and electrical widgets for building Mad 
     Scientist stuff is:
     
     C & H Sales Company. 
     www.candhsales-dot-com (haven't tried this url)
     1800-325-9465 (call for the cool catalog)
     
     dc and ac motors 60 and 400 hz, stepper motors, gearing,
     variacs, tubes, caps, muffin fans, blowers, hv wire, meters, relays, 
     line filters, power supplies, and so on, at surplus prices.  Some 
     really strange stuff too. (Infra-red tank periscope?)
     
     hope that helps
     
     paul mathus


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Subject: Looking for motor
Author:  Tesla List <tesla-at-pupman-dot-com> at InterNet
Date:    10/5/99 11:25 PM


Original Poster: Patti Stapivic <pstapivic-at-yahoo-dot-com> 
     
Howdy fellow coilers,
     
It seems that the last time I fired up my coil, my 
motor was fine but my variac arced to the RSG.  Some 
details:
     
1 hp universal motor at 10,000 rpm, 
0 to 120v 25 amp variac,
14 inch G10 rotor with 12 25/32 brass inserts that 
hold 1/2" tugston electrodes
     
The problem is I am having trouble attaining greater 
than 1800 rpms on the rotary.  I'm thinking this might 
be due to the tourque band of the motor. It probably is 
one hp at 10,000 rpms and is unable to overcome the 
weight of the rotor rpms.  What I'm looking to do, is 
construct a syncronous RSG, and I am looking for an 
1800 rpm motor around 2 to 3 hp.  Does anyone know 
where I might be able to find such a creature?  Also if 
I could find one, I could use a universal type motor 
that will be develop around the same hp with a lower 
rpm.  I've already searched McMaster-Carr, Grainger, 
and other places but they don't seem to have what I am 
looking for.  Any help would be appreciated as always.
     
Thanks all,
Rodney
     
     
     
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