Re: better sync motor mods?

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

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

In a message dated 1/9/01 9:16:24 PM Eastern Standard Time, tesla-at-pupman-dot-com 
writes:

> Hi John,
>  
>  I had a thought along the same lines a while back. This was probably in May
>  of last year, anyway just before I built my second sync rotary. I had
>  thought that rather than cutting a flat, why not mill a groove in the rotor
>  that is deep enough to cause the magnetic field which is induced in it to 
be
>  separated into "poles" without removing so much material as to cause the
>  current to increase as much as it would with the flats. I also thought that
>  the torque might not be diminished as much. I tried this on one motor, but
>  it would not lock in sync. once I had turned the grooves into flats of the
>  same depth, it worked as expected. I don't know if it would have worked if 
I
>  had made the grooves deeper. As far as cutting the current bars goes, it
>  seems to me that some have to be cut to get the thing to sync. I had
>  wondered if this might not be more the mechanism than the iron removal.
>  
>  later
>  deano

Deano,

Thanks for that report.
Whenever I've modified motors, I've never had to cut all the way
through the current bars.  But it sounds as though you have?
How wide were the grooves you cut, relative to the uncut
portions?

John Freau