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

[Gary Lau <glau1024@xxxxxxxxx>]

>From the videos, it appeared that the phase varied directly with the applied
voltage from the Variac, so any additional Variac for controlling phase
might be redundant.  It's not clear just what the acceptable range of
applied voltage is?

Regards, Gary Lau
MA, USA

On Fri, Dec 17, 2010 at 12:15 PM, Futuret <futuret@xxxxxxx> wrote:

> 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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