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

[Gary Lau <glau1024@xxxxxxxxx>]

If I might bare my ingorance -  would a shunt-wound configuration have the
brushes directly powered from the mains?  That would be certain death to the
diodes and brushes, no?  Having the armature wired in series at least
provides some ballast.

Regards, Gary Lau
MA, USA

On Thu, Dec 16, 2010 at 10:59 PM, Futuret <futuret@xxxxxxx> wrote:

> I wonder if the motor could be easily rewired to convert it to a shunt
> wound motor
> (instead of series wound), and then run it on rectified DC voltage.  This
> might result in a steadier speed, when used with Clive's modification,
> (or by replacing the diodes with a short, or whatever works/helps).  This
> might help overcome the voltage input sensitivity and eliminate the "crazy
> mode",
> Just a thought.  I haven't worked much with shunt wound motors.
>
> In a shunt wound motor, the speed can be adjusted by controlling the
> armature voltage, the field voltage can remain constant.  This might
> permit the motor to remain in sync with a heavier loading.
>
> Cheers,
> John
>
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> -----Original Message-----
> From: Futuret <futuret@xxxxxxx>
> To: tesla <tesla@xxxxxxxxxx>
> Sent: Thu, Dec 16, 2010 9:19 pm
> Subject: Re: [TCML] How To Turn A Vacuum Cleaner Motor Into A Synchronous
> Motor
>
>
> Stefan, Clive,
>
> I wonder how the torque compares with the usual modified
> induction motor sync 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
>
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