Re: Sync rotor

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

Original poster: "by way of Terry Fritz <twftesla-at-qwest-dot-net>" <FutureT-at-aol-dot-com>

In a message dated 9/26/01 9:25:36 PM Eastern Daylight Time, tesla-at-pupman-dot-com 
writes:

> One friend report to me that he saw a synchronous motor having 4 
>  holes in the rotor parallel to the shaft just under the surface
>  instead of flat???
>  

Luc,

It may be a hysterisis type motor which will lock in a 
different position every time it starts.  These motors often 
use just a hollow cylinder of special steel for the rotor.
One of mine has a thin plate at each end of the rotor.
The thin plates have 4 large holes drilled into them.

John