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

[dave pierson <dave_p@xxxxxxxxxxx>]

> 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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