Re: 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 4:12:54 PM Eastern Standard Time, tesla-at-pupman-dot-com 
writes:

> Dear List,
>  >  
>  > Referring back to the thread of filing/grinding flats on the rotor to 
> convert
>  > to synchronous, I must have missed something . . . . . how many flats are
>  > needed, do they extend the length of the rotor, and does the thickness of
>  > material removed matter a lot?
>  > Thanks for any info
>  >  
>  > Regards
>  >  
>  > Chris

Chris,

THe amount of material removed is not *real* critical, but in
general if too much material is removed, the motor will run hot,
and lose power.   If not enough material is removed, the motor
will lose sync power also.  I generally make the flats 1" wide
for a 3 2/8" dia armature, but a 3/4" wide flat is probably OK
too (this is for an 1800 rpm motor which gets 4 flats).

Yes, the flats extend for the full length of the rotor.

A 3600 rpm motor gets 2 flats, and these should be maybe
1/2 the dia in width.  I have not tried narrower flats on the 3600
rpm motor.  

I just posted a suggestion for cutting V notches instead of
flats, but I haven't tried it.

John Freau