Re: sync motors - update

["Tesla list" <tesla-at-pupman-dot-com>]

Original poster: "Terry Fritz" <twftesla-at-qwest-dot-net>

Hi Sean,

I must wonder if it is the strobe light.  Hand held strobe and RPM units are
accururate to about 0.1% if they are really good.  Perhaps you are sure it is
exactly 60 Hz but the strobe is more likely to be wrong than the steel and
physics of the motor.

Cheers,

        Terry



At 01:41 AM 1/30/2002 -0500, you wrote: 
>
> I just tested the sync motor conversion with a modified strobe light setup,
> running exactly in sync with the AC line, and it appears that the motor is
> slightly slower than 3600 RPM.  It was rated at 3400 RPM, and appeared to be
> running at 3600 as far as I could tell, until I used the strobe.  The mark on
> the shaft that I made turns backwards from the normal direction of spin at
> about 1, or a little less, RPM.  I tried best I could to put a load on the
> motor (just the shaft sticking out), and it didn't seem to change at all. 
> Anyone have any ideas what's going on?  Do I need to make the flats in the
> armature bigger?  I noticed in the "plans" at
>
> <http://hot-streamer-dot-com/TeslaCoils/Misc/syncmot.zip>http://hot-streamer.c
> om/TeslaCoils/Misc/syncmot.zip, it says 1750 or 3450 RPM, my motor was 3400
> RPM - does this make a difference?  It is an induction motor - nothing on the
> armature, and two field windings, with 2 starting coils.  Should the
> sstarting be disconnected? (I haven't yet).  Thanks!
>
> ---------------
> Sean Taylor
> The Geek Group
> G-1 #1204 
> <http://www.thegeekgroup-dot-org>www.thegeekgroup-dot-org
> Because the Geek shall inherit the Earth!
>  
>
>