Re: Modification to induction motor for Synchronos operation

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

Original poster: "BunnyKiller by way of Terry Fritz <twftesla-at-uswest-dot-net>" <bigfoo39-at-telocity-dot-com>

> Snipperz......
>
> 3. I have a copy of the text of a post containing a method for
determining flat
> width dimensions to be ground, but sadly I don't have the originator's
details.
> In essence, the information given was a formula for the flat width with rotor
> radius as the variable. The information source was U. N. O. who ever that
was.
> There were two options: one with  a 38 degree arc for a motor with non dead
> pole windings and one with a 40 degree arc for motors with dead poles. My
width
> calculations are 8.84mm and 9.78mm respectively. Are these figures
reasonable?
> Also, how does one recognise a non dead pole winding from a dead pole motor
> what ever dead poles are?
>

Hi Chuck...

the UNO info came from me  :)

this formula is useable for induction type motors  ( cap start and/or cap run)

"dead pole" and "non dead pole" refers to the stator part of the motor (
the non rotating part of the motor). If
you look inside the motor case you will see the windings in the stator
core, in a "dead pole" stator there will be
a section of the stator which will have no wires run thru the core at 90
degrees apart. A "non dead pole" motor
will have wires entering the slot from each side of the core ( once again
90 degrees apart) but not sharing any
other windings from the rest of the core.

I would use the 8.8 mm width on the core you have, if you find the motor
isnt locking into sync then go for the
9.8mm.

and for the flat length...  it extends the whole length of the rotor

the reason for the smaller dia. compared to US moters is the supply voltage.


Scot D