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Re: [EVDL] Magnetic Shock Absorber & EV

> So, how much energy would we get if we converted all of the suspension
> movement into electricity? I suspect the total would be trivial on
> most roads, as these components would get uncomfortably hot generating
> anything over a couple hundred watts/hour. Best-case, you'd be lucky
> to add 1% to an EV's range - not what most would consider money
> well-spent.

I'm not sure. Magnetic damping effects decrease exponentially with
decreasing speed. I know from reading Tesla Motors blogs that they had
to put a big water bag in the passenger's seat with tubes running to
each of the shocks to keep them cool while they did the accelerated
wear tests. While the there would be some energy capture I doubt that
it would be very much but I don't have any data to back that up. I
know that passing them through a coil hooked up to a galvanometer
caused a sharp needle deflection but the duration was much shorter and
the magnet had to be in very close proximity to the coil, ie. the coil
couldn't be too large compared to the size of the magnet. Some, if not
all, of the shake flashlights use a neodymium magnet. I have one with
a single white led and what looks like a 1F capacitor where 60sec of
shaking gives about 20min of usable light (meaning it is getting a
little dim but you could still walk down a dark path ok.)

David D. Nelson

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