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Re: Electrical Pendulum Drive (was Re: moon's synchronism)




Brian replied to my query:
. . .
There is a power assymmetry as between the bob approach
and the bob departure in either case which effectively modulates the
60Hz
current. A change in inductance causes a marked change in current, so
the
current rises with the approach of the bob. The current peaks however,
after the bob has passed the center of the solenoid. It is this
unbalanced
force which maintains the pendulum in a strikingly simple way.

Whatcott Altus


So the pendulum gets an effective "kick" only once during each period of
ITS oscillation (like manually pushing a swing); the pendulum is not
subjected to a continuous 60 Hz force. The response is not to be
compared to that of a 10 second (period) oscillator driven by a 60 Hz
force. N'est-ce pas?

-Bob

Bob Sciamanda sciamanda@edinboro.edu
Dept of Physics trebor@velocity.net
Edinboro Univ of PA http://www.edinboro.edu/~sciamanda/home.html
Edinboro, PA (814)838-7185