Re: Sync Motors

["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 3/16/02 10:14:34 PM Eastern Standard Time, tesla-at-pupman-dot-com
writes:

Ben,

The dead pole concept is more
suitable for larger motors.  Best to ignore the dead pole concept.
Instead, simply make the flats about 1/4 or 1/3rd the armature
diameter.  For example, if the armature is 2" diameter, then
make the flats about 1/2" wide.  You need to make two flats,
180 degrees apart.  Your motor may handle only a 4" dia lightweight
rotor perhaps.  If the motor is too weak, sometimes you can boost
it's power by using a slightly larger run cap.  Also, the phase
shifter at my website can also boost the power.

  http://hometown.aol-dot-com/futuret/page3.html

cheers,
John


>
> Hi all,
>    I have a small induction motor that i'd like to turn into a sync motor..
> however, I can't seem to figure out where the dead poles are. The motor is
> rated at 3500rpm and uses a 4uf cap to run.. it only draws 450mA -at- a rated
> 1/37
> HP.. (this is gonna be a really small sync gap for a table top coil.. just
> for
> fun.. :-D ).. I'm guessing there should be 2 run windings since it is 3500
> rpm.. but there don't appear to be any start windings.. do I have the wrong
> kind of motor? (non-salient pole) Thanks for any help.. 
>
> Coiling in Pittsburgh
> Ben McMillen
>
>