Peri Hartman via EV wrote:
Are you sure 24V is safe ? Yes, at low current, and it could be current
limited. But in that case there's probably not enough current to be a
significant part of running the motor.
UL considers voltages less than 24vac and 8 amps maximum as a "safe"
class-II circuit, which can be exposed so people can touch it. You may
feel it; but it won't injure you.
But if it's in a kid's amusement part, it has to be super-SAFE! Not just
actually safe; but also give the appearance of being safe, regardless of
the facts. Some parent may see a spark from a rail, and go ballistic.
My thought would be to have the "parking spot" for the engine be the
only spot that has the electrified rails to charge it. The engine itself
blocks access to the "live" rails.
Then put enough batteries in the engine to run the train for a
"reasonable" length of time between charges. Remember that steel wheels
on steel rails can have very low rolling resistance. And that weight in
an engine is good; traction is poor. :-)
Another possibility might be inductive charging (no shock hazard). Cut a
big 60Hz transformer in half. Mount it so the primary half is between
the rails in the engine's "parking" spot, and the secondary half is
under the engine. When the transformer halves meet, you can charge at
high current. And, you won't be able to move thet engine while charging;
the transformer halves with lock together like an electromagnet!
Lee Hart
--
A designer knows he has achieved perfection not when there is
nothing left to add, but when there is nothing left to take away.
-- Antoine de Saint Exupery
--
Lee Hart, 814 8th Ave N, Sartell MN 56377, www.sunrise-ev.com
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