Re: [TCML] Two phenomena...

["Phil Tuck" <phil@xxxxxxxxxxx>]

EVP,
Good point that: something I had not really considered to be that 
significant at the time.

Phil

--------------------------------------------------
From: "EVP" <evp@xxxxxxxxxxx>
Sent: Tuesday, July 27, 2010 5:51 PM
To: "Tesla Coil Mailing List" <tesla@xxxxxxxxxx>
Subject: Re: [TCML] Two phenomena...

> Phil Tuck wrote:
>
> > Joe,
> > As  others have said you are slipping out of sync. I modified a motor 
> > once and checked its sync' by using an oscilloscope (the disc itself 
> > tripped an IR beam and then compared it with the mains cycle on a duel 
> > channel o'scope)
> > It showed itself to be in sync' until I ran it with the added the weight 
> > of the electrodes and their holders. Then it would very slowly slip out 
> > of sync', with it only 'aligning' with the mains cycle once every couple 
> > of seconds. You could actually watch the trace on the scope slowly 
> > creeping across the screen, instead of staying stationary.
> >
> > In my own case (which is unlikely to apply to you unless you are using a 
> > motor you have modified yourself) I needed to remove a bit more from the 
> > 2HP motor's rotor.  Most likely though it is as John or Garry suggests: 
> > Voltage drop; motor size; phase controller. My favourites being the first 
> > two: especially motor size.
> >
> > Have fun.
> > Phil
>
>    Almost certainly the problem was the windage loss rather than the added 
> weight itself.  Turns out that disks rotating at high speeds pump a lot of 
> air from the middle to outside and that causes significant retarding 
> torque.  As I recall the windage increases as the cube of the speed and 
> the fifth power of the disk diameter.
>
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Regards
Phil Tuck

www.hvtesla.com 

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