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

Teslalabor teslalabor at t-online.de
Fri Dec 17 05:14:56 MST 2010

```Hi John,

I just found the ultimate solution. I was able to eliminate the crazy-mode
completely and also now my motor is self starting. Will post the videos and
how I did it soon.

Stefam

----- Original Message -----
From: "Futuret" <futuret at aol.com>
To: <tesla at pupman.com>
Sent: Friday, December 17, 2010 4:59 AM
Subject: Re: [TCML] How To Turn A Vacuum Cleaner Motor Into A Synchronous
Motor

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

Cheers,
John

-----Original Message-----
From: Futuret <futuret at aol.com>
To: tesla <tesla at pupman.com>
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.

Cheers,
John

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