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

[dave pierson <dave_p@xxxxxxxxxxx>]

> The poster mentions that he had "the mains on the other" [ channel] 
> So I assume a mains reference sine wave on the other channel.
      Good point.  However:

>> In usual engineering use of the term synchronous motor, the speed is
>> set by the line frequency.  Strobe Testing with a magnet spun by the
>> same motor as a sync source demonstrates that one end of the motor
>> (where the magnet is) is 'synchronous' with the other end.

>> If a scope is to hand: most have a 'line sync' position, which syncs
>> the scope to the _line_ freq.  With line sync selected, a reading from
>> the flying magnet to a sense coil would be interesting.
 
>> A motor which (happens?) to be running at 3000 (ish) will appear
>> synchronous to 50 (or 60, or 30 or 100).  A proper synchronous motor
>> will hold synch Under Varying Load. 
     The key is just above.  a 'truly synchronous' motor will
     hold speed, and phase, under varying load and input
     voltage, (within reason...).  

     best
      dwp 
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