There are a few technical problems with flywheel energy storage and moving vehicles.There is a term called "precession"It's why a gyroscope stands up when spinning and doesn't fall over. If you push it over it resists and pushes back.If you force it over it goes in a different direction. It "wants" to point in 1 direction.Put a 70,000 revolution per minute gyroscope in a car. You can drive in a straight line only. If you try to turn, you cannot because you have 25+ kilowatts saying otherwise.The car will "precess" around the gyroscope (ie roll over slowly or violently)Then the gyroscope will slip off its bearings and catastrophic disassembleThe new term is RUDWe had an ultracentrifuge spinning 70,000 rpm, it was a pyramidal shaped cylinder that exploded.It "slamdanced" for about 20 minutes it's container , about the size of a refrigerator, hitting walls, bleeding off energy.I think gyroscopes may be good for stationary storage, although Beacon energy, that was pushing it also had an explosion of its energy storage.You also have to continually recertification the centrifuges and take out of use as they still have limited life spans, not good for cars
Sent from Yahoo Mail on Android On Fri, Feb 9, 2018 at 3:17 AM, Paul Compton via EV<ev@lists.evdl.org> wrote: As I recall, there was a company that had produced a commercial 30kWh flywheel storage system. Ideal for peak load shaving, voltage/frequency stabilisation, and buying off peak to use during the day etc. Cycle life was essentially infinite with the rotor spinning on magnetic bearings in an evacuated chamber. It wasn't physically small, something like 4 meters tall. JET, the joint European torus fusion research facility uses flywheel storage to provide the enormous peak power needed to drive the magnetic bottle. "The main source of power for establishing the magnetic fields required for inducing and confining the plasma current in the machine consists of the two identical Flywheel-Generator-Convertor (FGC) systems. At the heart of each system is a 409.8 MVA fly-wheel ALSTOM generator, with its own auxiliaries including oil systems, air-cooling system, pony motor, excitation equipment, LV distribution for supply of auxiliaries and HV distribution for generator excitation and pony motor drive." On 8 February 2018 at 16:20, Dan Kegel via EV <ev@lists.evdl.org> wrote: > On Wed, Feb 7, 2018 at 2:30 PM, Robert Bruninga via EV > <ev@lists.evdl.org> wrote: >> I wonder how big a flywheel is needed to store the energy to charge a 250 >> mile range in 20 minutes? >> Since it is fixed, and does not have to be in a vehicle, it might be the >> answer to large charging stations. >> >> When ten TESLAs pull up at ten fast charge cords at the same time, that is >> over a megawatt of needed power... in 20 minutes... > > That application doesn't capitalize on the flywheel's ultrafast > charging and discharging abilities. > And smoothing can be done by modulating the teslas' charging rates. > > But hey, who knows. See > https://scholar.google.com/scholar?as_ylo=2014&q=flywheel&hl=de&as_sdt=2005&sciodt=0,5&cites=16378509166563059026&scipsc=1 > for recent related papers. > - Dan > _______________________________________________ > UNSUBSCRIBE: http://www.evdl.org/help/index.html#usub > http://lists.evdl.org/listinfo.cgi/ev-evdl.org > Please discuss EV drag racing at NEDRA (http://groups.yahoo.com/group/NEDRA) > -- Paul Compton www.morini-mania.co.uk www.paulcompton.co.uk (YouTube channel) _______________________________________________ UNSUBSCRIBE: http://www.evdl.org/help/index.html#usub http://lists.evdl.org/listinfo.cgi/ev-evdl.org Please discuss EV drag racing at NEDRA (http://groups.yahoo.com/group/NEDRA) -------------- next part -------------- An HTML attachment was scrubbed... URL: <http://lists.evdl.org/private.cgi/ev-evdl.org/attachments/20180209/9e3fd29a/attachment-0001.html> _______________________________________________ UNSUBSCRIBE: http://www.evdl.org/help/index.html#usub http://lists.evdl.org/listinfo.cgi/ev-evdl.org Please discuss EV drag racing at NEDRA (http://groups.yahoo.com/group/NEDRA)
