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

["Teslalabor" <teslalabor@xxxxxxxxxxx>]

Hi John,

okay tomorrow I will try my (of course yours ;-))) ) phase shifter at the 
modified motor. Well, I designed it years ago for my medium SRSG with 
modified async motor (with flats cutted) but lets see if it's capacitor 
value is ok on the modified universal motor.
And no I think I will do no further research at these motors because I have 
a plenty of real sync motors available and the universalmotors are only of 
theoretical interest for me.

Stefan

----- Original Message ----- 
From: "Futuret" <futuret@xxxxxxx>
To: <tesla@xxxxxxxxxx>
Sent: Friday, December 17, 2010 6:15 PM
Subject: Re: [TCML] How To Turn A Vacuum Cleaner Motor Into A Synchronous 
Motor


Hi,

Excellent work, and a fun project !  The start-up sounds really cool !
Now I'm curious if this type of sync motor will work with my phase
controller circuit.  I agree with Clive that it will probably work.

It would still be interesting to see what happens if the opposing 180 degree
segments are merely shorted (no diode).  Maybe Clive tried that
and it didn't work??  It will also be interesting too see how Clive's
and the other fellow's idea of diode-ing across less than 180
degrees works out.

Are you still going to try adding some resistors Stefan just to
see what effect it has?

Cheers,
John










-----Original Message-----
From: Teslalabor <teslalabor@xxxxxxxxxxx>
To: Tesla Coil Mailing List <tesla@xxxxxxxxxx>
Sent: Fri, Dec 17, 2010 10:48 am
Subject: Re: [TCML] How To Turn A Vacuum Cleaner Motor Into A Synchronous 
Motor


Hi,



I think today I was able to make a vast improvement. The key is, not only

soldering 2 segments, there have to be soldered at least 2 segments on each

side together.



After soldering 2 segments on each side, the "crazy-mode" completely

disappeared, as you can see in this video, and the motor becomes

selfstarting:



http://www.youtube.com/watch?v=n0uJiIwhpq8



Then I soldered another segment on each side and the motor gets more current

and therefore more power and the sync gets much more stable, I think the

more segments, the heavier the load the motor can accelerate:



http://www.youtube.com/watch?v=nAK5eAKoZHk



And then, with 4 segments on each side, the motor runs quiet perfect:



http://www.youtube.com/watch?v=iNyOuBh9vaA


It is self-starting from every starting position the armature has. And, I

recognized, that it is important to apply voltage to motor fairly abruptly,

as David Sharpe said, not with a variac.


So, I think even more segments could be soldered but then it will be

necessary to reduce the current with additional resistors in series with the

diodes. There will be a "sweet spot" of the optimal amount of segments but I

am to lazy to find it out ;-)


Best Regards

Stefan






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