Re: Summing up of Async Vs. Sync

["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 6/22/01 10:01:08 AM Eastern Daylight Time, 
tesla-at-pupman-dot-com writes:

> 
>  How does grinding flats on the shaft or rotor thing make it sync?
>  
>  Seriously out of tune,
>  Matt Shayka

Matt,

Without flats, the rotating magnetic field cannot "grip" a
particular point on the armature, so the armature slips
constantly.  This slipping permits the motor to draw more
power and produce more power as the load is increased.
When flats are ground, the magnetic field grips the 
un-ground area, so it locks to the field and doesn't slip
anymore.  However, this arrangement limits the motor's
torque.  If the motor is burdened with heavy a load, the
motor will lose lock (lose sync), until the load is reduced,
and the motor can lock up again.

John