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

["Phil Tuck" <phil@xxxxxxxxxxx>]

 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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