[sdiy] Strobe tuners & synchronous motors rerevisited

[Roy J. Tellason]

On Monday 21 April 2008 14:27, anthony wrote:
> I found an induction motor from an old clock that had a magnetic rotor. Do
> you think that would work sufficitently as a synchronous motor for a strobe
> tuner? With the gear train removed, it doesn't have a lot of torque and the
> direction it will turn is indeterminate (is that what the startinng motor
> is for on Hammond organs?).

No,  the starting motor is because synchronous motors back then didn't have 
enough torque to get things going,  though they could keep them going once 
you got some momentum built up.

No way should a clock motor be indeterminate as to direction!  There's usually 
a "shaded pole" (looks like a loop of heavy wire) that decides that.

> I know some synchronous motors have designs with definite rotation direction
> that's usually selectable. I also wondered if this motor motor I got from an
> 8-track recorder is a synchronous motor: it runs right off of the AC line at
> 117VAC (In Japan maybe) 

Japan uses 100VAC.

> with a speed of 18,000 RPM... It's a cool motor at any rate. 
>
> Incidently, the old Hammond organs that I can get for cheap or M100's and
> L100's, not M3's does that make it less of a sin to use them for parts?

No.  :-(


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