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

[dave pierson <dave_p@xxxxxxxxxxx>]

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. 

best
 dwp
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