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

[Futuret <futuret@xxxxxxx>]

 It's good to try out various ideas and methods.  It seems to me that with brushes
in place, the only value of the diode is that it causes self-starting.  However it weakens
the sync-lock, and causes arcing at the brushes.  Adding a resistor in series with the 
diode as you mentioned, might be helpful.  It may reduce the current enough to give a
stronger sync-lock while still allowing for self-starting, but may also reduce arcing at 
the brushes.  Adding the resistor should also prevent diode failure.  There may not
be a whole lot of physical room there to add the resistor however.  Also the resistor
may run hot.  

Another idea is to use only a resistor (no diode).  The resistor should be selected to 
pass only enough current to permit self-starting.  By not using a diode, there would
be more room for the resistor.  A resistor can be placed on each side of course
to allow for the use of smaller resistors, for better heat radiation, and for balance.
By using resistors only, the motor should give good sync-locking, self-starting,
and no arcing at the brushes.

Cheers,
John

 


 

 

-----Original Message-----
From: Teslalabor <teslalabor@xxxxxxxxxxx>
To: Tesla Coil Mailing List <tesla@xxxxxxxxxx>
Sent: Wed, Dec 29, 2010 9:05 am
Subject: Re: [TCML] How To Turn A Vacuum Cleaner Motor Into A Synchronous Motor

Hi,


I just did some experiments. I removed the brushes completely and only 

connected the stator coils. I realized, that this is just impossible, 

because of the only 2 stator coils and the lack of a capacitor, no rotating 

magnetic field is generated and this never could work. I tried everything, 

also the adition of 2 more shorted segments (4 on each side) with diodes 90 

degrees appart, diodes in opposite diections, but without the brushes in 

place, the rotor doesn't rotate anymore. It only creates some forces and 

locks in different positions.

Stefan



 
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