Re: Sync motor :-(

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

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

Hi Josh,

I assume the motor's armature looks pretty much like:

http://hot-streamer-dot-com/temp/salnt_1t.jpg

With the flats ground close to those pictured.

The only thing I can think of is that the starter winding switch is not
disengaging properly.  When the motor reaches a certain speed, the heavy high
current starter windings are supposed to be turned off by a centrifugal switch.

Maybe give the internal starter winding switch and it's mechanism another look.

Cheers,

        Terry

At 12:30 PM 7/28/2001 -0400, you wrote: 
>
> Hello, everyone 
>       I had a 1/3 HP, 1725 RPM motor sitting in my barn, just waiting to be 
> synched. Plus with my dad having all the facilities at work to grind the 
> flats, and cut a perfect disk, I thought I'd give SRSG a try... So I popped 
> the thing apart and measured the distance of the pole on one side of the DP 
> to the pole on the other side. It was .750" So my dad took it to work, and 
> precision cut the flats .780" exactly 90º on the rotor. I put it back 
> together, and turned it on. It was noticeably louder, and got hot fast. I 
> taped a cardboard circle on it with first a dot, then a line drawn on it. 
> With a fluorescent bulb, I could see them spinning very fast (this was at 
> 10:30 when it was very dark). So I got out my RPM meter, and clocked it at 
> 1625 RPM :-( . Then as it got hotter, I could hear the pitch go up and down, 
> and so did the RPM. It was definitely not in sync. What could be wrong? The 
> extra 30 thousandths he added couldn't have done this. I'd hate to guess how 
> many amps it was drawing there at the end. 
>
> --------------------------------------- 
> Jonathon Reinhart 
> hot-streamer-dot-com/jonathon