Re: [TCML] How To Turn A Vacuum Cleaner Motor Into A Synchronous Motor

["Teslalabor" <teslalabor@xxxxxxxxxxx>]

John,

I allready modified some usual induction motors for sync and definitely the 
modified universal motors have much more torque because the field the 
armature generates is much stronger.
I'm sure the problems of self-starting and crazy-mode can be solved. I will 
do some more experiments with additional diodes and more segments.
Yes it was me who suggested shorting two segments together at each side to 
give a "wider" effect. Maybe will try this first today. But I expect that 
there will me to much current flowing then and also the self-starting isue 
becomes still more a problem.

Best Regards
Stefan

----- Original Message ----- 
From: "Futuret" <futuret@xxxxxxx>
To: <tesla@xxxxxxxxxx>
Sent: Friday, December 17, 2010 2:56 AM
Subject: Re: [TCML] How To Turn A Vacuum Cleaner Motor Into A Synchronous 
Motor


Stefan, Clive,

It's intriguing to see a series wound universal motor running in sync like 
that.
I'm impressed with Clive's clever motor modification.  I assume the sine 
wave
on the scope is line-locked mains voltage.

I like the crazy mode and the strange sounds although the Tesla coil
won't like it, LOL.  The crazy mode and various strange sounding modes
sound as if the motor is hunting.  The hunting issue might become worse
(or better?) using a heavier rotor?  I wonder how much torque the
motor can provide and still stay in sync?  I wonder how the torque compares
with the usual modified induction motor torque?

I wonder what would happen if two more diodes were added at
90 degrees on the commutator (this could only work if there
are the correct number of segments on the commutator).

I wonder also if just cutting the two 120 degree opposed segments
free from the winding would also give a sync result?  Or maybe
just short together the 120 degree opposed segments (no diode)?

Someone suggested shorting two segments together at each side
to give a "wider" effect.  That might be something else to try.

Clive does your motor self-start?

Cheers,
John










-----Original Message-----
From: Teslalabor <teslalabor@xxxxxxxxxxx>
To: Tesla Coil Mailing List <tesla@xxxxxxxxxx>
Sent: Thu, Dec 16, 2010 7:54 pm
Subject: Re: [TCML] How To Turn A Vacuum Cleaner Motor Into A Synchronous 
Motor


Hello,

today I modified a 400W universal motor from a washing machine. I used 2

diodes each 1kV/6A. I did a scope test which shows that the motor runs

perfectly sync:

http://www.youtube.com/watch?v=yOlfzxzucy8

But there are 2 problems: The motor is not self-starting AND the motor

sometimes runs in "crazy mode", as I call this strange behaviour.

"normal-mode" and "crazy-mode" - both can be seen in the video.

Best Regards

Stefan






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