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RE: can this motor be made sync?

Original poster: "Colin Dancer" <Colin.Dancer@xxxxxxxxxxxxxxxxxx>

That looks like a "shaded pole" motor.  These tend to be low torque to
begin with, and generally can't be converted to sync operation.  The
grinding of flats significantly reduces the magnetization of the rotor
and hence the available torque.  Once you get below a critical limit it
will never lock.

What you want is an induction motor with a "run capacitor".  These are
normally convert very well, but a large disk will need a large motor
given the loss of torque.  Cheap bench grinders with induction motors
work well.

Colin.

-----Original Message-----
From: Tesla list [mailto:tesla@xxxxxxxxxx]
Sent: 06 October 2005 22:32
To: tesla@xxxxxxxxxx
Subject: Re: can this motor be made sync?

Original poster: "Dan" <DUllfig@xxxxxxxxxxxxx>

What makes an induction motor a-synchronous, is the fact that the
armature is not magnetized. Period. if the armature does not slip with
regards to the rotating magnetic field, there would be no induced
magnetic field in the armature. That is why induction motors run slower
than synchrony. It's not because it has no flats.
Manufacturers would have thought of that already, if it acutally worked.
No amount of flats is going to fix that. I don't know where that idea
came from, i've seen it before on some website. I just chuckled.

The only way would be to somehow magnetize the armature, but since it is
mostly aluminum, I don't see how you would do that.

Dan

----- Original Message -----
From: <mailto:tesla@xxxxxxxxxx>Tesla list
To: <mailto:tesla@xxxxxxxxxx>tesla@xxxxxxxxxx
Sent: Wednesday, October 05, 2005 7:13 PM
Subject: can this motor be made sync?

Original poster: tesla popp
<<mailto:teslas_lab@xxxxxxxxx>teslas_lab@xxxxxxxxx>

ignore the blank message i acedentally i sent...

I have obtained a source of motors for $2 each.  i tried the flats thing
to no effect.  I slowly ground down the armature until the edges nearly
met, but no luck what so ever.  i figured they would be good for a
"terry blake propeller style rotery gap"

my question for you is:  can this type if motor be made synchronous???

here are some pics

<http://www.amasingscience.com/teslacoils/flats>http://www.amasingscienc
e.com/teslacoils/flats
on
motor.jpg

<http://www.amasingscience.com/teslacoils/motor.jpg>http://www.amasingsc
ience.com/teslacoils/motor.jpg