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- Xref: sparky sci.electronics:21312 sci.energy:6326 rec.autos.tech:17024
- Path: sparky!uunet!utcsri!newsflash.concordia.ca!mizar.cc.umanitoba.ca!access.usask.ca!skorpio!choy
- From: choy@skorpio.usask.ca (I am a terminator.)
- Newsgroups: sci.electronics,sci.energy,rec.autos.tech
- Subject: Re: Flywheel batteries as EV power source
- Date: 21 Dec 1992 20:46:35 GMT
- Organization: University of Saskatchewan, Saskatoon, Canada
- Lines: 54
- Sender: choy@skorpio (I am a terminator.)
- Distribution: world
- Message-ID: <1h5afbINN1hs@access.usask.ca>
- References: <1992Dec13.114534.961@cmkrnl.com> <1992Dec15.004956.465@mtu.edu> <1992Dec15.194558.2556@adobe.com>,<1992Dec16.192456.6261@news.cs.brandeis.edu> <1goebdINNik@gap.caltech.edu>,<1992Dec17.035214.15058@u.washington.edu> <1gov35INNik@gap.caltech.edu>,<1992Dec17.170002.28389@u.washington.edu> <1gqhdqINNjot@gap.caltech.edu>
- NNTP-Posting-Host: skorpio.usask.ca
-
- In article <1gqhdqINNjot@gap.caltech.edu>, carl@SOL1.GPS.CALTECH.EDU (Carl J Lydick) writes:
- |> In article <1992Dec17.170002.28389@u.washington.edu>, basiji@stein.u.washington.edu (David Basiji) writes:
-
- |> Perhaps you'd care to review the title of the
- |> thread: "Flywheel batteries as EV power source." That's why I was talking
- |> about enough energy to travel for ~100 miles at freeway speeds. Now, if you
- |> simply want to use the flywheel for load averaging, then we're talking about a
- |> LOT less energy stored in the flywheel. In that application, I'd agree with
- |> you that the dangers of a catastrophic failure of the flywheel would be quite
- |> acceptable.
- |>
- |> =It is the flywheel which provides the motive force
- |> =for the vehicle via some clutch and gearbox or torque converter.
- |>
- |> The idea in this thread was that the flywheel is part of a generator which
- |> provides electrical power to the vehicle's electric motor. That's what the
- |> "EV" stands for in the title of the thread, and why it refers to the flywheel
- |> as a "battery."
-
- I've seen massive rotating objects being used in electrical power generation.
- For instance, a turbine shaft in a hydroelectric generator that looks the size
- of a spinning boxcar. If the water was shut off, the thing would grind to a
- halt pretty quick because of the counter torque from a loaded generator (Some
- generators are run as motors so that the power production is kept up; you don't
- want to have to stop and restart this spinning boxcar). This shaft isn't
- running all that fast so there isn't as much fear of explosive breakdown, but
- I bet there's a lot of kinetic energy.
-
- A flywheel that has the power to run a car at highway speeds (I read in the
- paper that 8 hp can maintain the speed on average) can be compared to giving
- a car a big slap in the rear and seeing how far it can coast. If you want to
- store so much kinetic energy, you'll need a very fast wheel. It shouldn't
- slow down too much unless you can pick it up again.
-
- I've had little toy cars with flywheels and toy cars with windup springs.
- How about spring energy or gravitational energy?
-
- --
-
- Henry Choy
- choy@cs.usask.ca
-
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-
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-
- -- Ren * Stimpy
-