A more modern name for a synchronous motor is a permanent
magnet stepper motor. Any PM stepper, and a couple of
microfarad capacitor becomes a synchronous motor when
connected to the power line.
-Chuck Harris
jimlux wrote:
Alternatively, use a
synchronous motor driving a load with sufficient inertia in combination
with a slotted disk and photo pickup. Perhaps an old record turntable
will do - but not one with a regulated DC motor.
A clever idea because of the mechanical low pass filtering, but probably
impractical..
A record turntable with a synchronous motor? That's going to be ancient and
hard to
find in this age of digital music players. People like us would happen to have
something in the garage.. but for a science fair project, unlikely that a 6-12th
grader would have such a thing, or even know where to find one. *I* have a lot
of
junk in the garage, and even some synchronous motors, but not one that could
directly
be connected to the mains.
an AC powered rotary dial electric clock, perhaps? (assuming it's not a wall
wart
powering a "quartz movement".)
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