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

[Futuret <futuret@xxxxxxx>]

Good point, maybe Stefan's resistor ideas would help in that case.  

And Stefan I like your resistor idea in general, it would reduce the stresses on
the brushes and diodes, and make self starting easier, as you said.

Interesting too about the superior torque ability of the modified universal motors.

I also didn't know that some induction type sync motors use small permanent
magnets.  Some time ago someone suggested adding small permanent 
magnets to a hysteresis type sync motor to make it start in the same
phase position every time.  Any thoughts if that might work?  

Cheers,
John

 

 


 

 

-----Original Message-----
From: Gary Lau <glau1024@xxxxxxxxx>
To: Tesla Coil Mailing List <tesla@xxxxxxxxxx>
Sent: Fri, Dec 17, 2010 8:21 am
Subject: Re: [TCML] How To Turn A Vacuum Cleaner Motor Into A Synchronous Motor


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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