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

["Teslalabor" <teslalabor@xxxxxxxxxxx>]

Next week I get some 1000V 6A diodes. Then I will modify a 800W universal 
motor from a washing machine and do the scope test (with magnets and pick up 
coil) to see, how good it sync's to the line frequency.
Will put a video of this to youtube. The torque of the "Pensold Motors" 
should be much bigger than any modified asynch. motor with flats on its 
armature.

Stefan

----- Original Message ----- 
From: "Phil Tuck" <phil@xxxxxxxxxxx>
To: "'Tesla Coil Mailing List'" <tesla@xxxxxxxxxx>
Sent: Thursday, December 09, 2010 7:38 PM
Subject: RE: [TCML] How To Turn A Vacuum Cleaner Motor Into A Synchronous 
Motor


Dwp,
  >Depends, rather, on the definition of synchronous.  Anything
   >spinning at 3000 rpm (or distinct other rpms) will appear
   >synchronous by this test,

  Which test are you referring to? The one you mistakenly thought was 
happening or the test I describe in detail using the scope and an infra-red 
detector / emitter pair.


At That Set of power/load/rpm.  A
  > synchronous motor, by engineering definition will lock to
   >the line frequency, quasi independent of load.

Exactly. That is what the test that I describe does.


Regards
Phil

www.hvtesla.com

-----Original Message-----
From: tesla-bounces@xxxxxxxxxx [mailto:tesla-bounces@xxxxxxxxxx] On Behalf 
Of dave pierson
Sent: 09 December 2010 14:51
To: Tesla Coil Mailing List
Subject: Re: [TCML] How To Turn A Vacuum Cleaner Motor Into A Synchronous 
Motor



> I think there is some misunderstanding here. I don't think the sensor
> and magnet were triggering the strobe as you do (I think that is what
> you're thinking?)

> The presumption is that the magnet was attached to the motor shaft
> such that it passed and induced a voltage into a fixed coil once per
> rev.

> If so, the output will always coincide with the electrode passing that
> point in space.

> If the scope is setup to show both channels overlaid, and the output
> from the sensor coil is fed into one channel, with the mains fed in on
> the other channel, and the output from the sensor subsequently always
> coincides with the same point on the mains sine wave, then the motor
> is synchronous.

   Perhaps.

   Depends, rather, on the definition of synchronous.  Anything
   spinning at 3000 rpm (or distinct other rpms) will appear
   synchronous by this test, At That Set of power/load/rpm.  A
   synchronous motor, by engineering definition will lock to
   the line frequency, quasi independent of load.

    best
     dwp
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