Flywheel energy storage

Point out news stories, on the net or in mainstream media, related to polywell fusion.

Moderators: tonybarry, MSimon

Skipjack
Posts: 6006
Joined: Sun Sep 28, 2008 2:29 pm

Re: Flywheel energy storage

Postby Skipjack » Sun Aug 07, 2016 11:47 pm


David_Jay
Posts: 57
Joined: Sat Jan 19, 2008 2:49 pm
Location: Grand Rapids, Michigan

Re: Flywheel energy storage

Postby David_Jay » Mon Aug 08, 2016 4:01 pm

This is commercially available technology. Flywheel UPS systems with magnetic bearings (for zero wear) have been available for years. Here is just one supplier:

http://www.power-thru.com/flywheel_ups_technology.html
not tall, not raving (yet...)

Carl White
Posts: 312
Joined: Mon Aug 24, 2009 10:44 pm

Re: Flywheel energy storage

Postby Carl White » Tue Aug 09, 2016 12:03 am

David_Jay wrote:This is commercially available technology. Flywheel UPS systems with magnetic bearings (for zero wear) have been available for years. Here is just one supplier:

http://www.power-thru.com/flywheel_ups_technology.html


Not for home use, yes. Probably only available at military prices. Also, the website hasn't been updated in three years, which makes me wonder whether business dried up after their initial order of 30 units.

Maybe Abigail Carson's innovation is to somehow make it all less expensive.

Giorgio
Posts: 2686
Joined: Wed Oct 07, 2009 6:15 pm
Location: China, Italy

Re: Flywheel energy storage

Postby Giorgio » Tue Aug 09, 2016 1:37 am

Permanent levitation of Flywheels for energy storage has been around from several years in scientific literature.
I don't see anything in the Phys.org article that is "Revolutionary" in her design. It looks like a self promoting news release without any meaningful info.
Additionally they just made "theoretical" calculation, and as we all know very well, theory and reality tend to diverge as the applications becomes more and more extreme.

"Although with the initial aim of rotating at 100,000rpm, Miss Carson's figures show her design can easily rotate at 144,000rpm without any adjustment - this is massively more powerful and quicker than most existing designs, which can spin at around 60,000rpm"
The reason why most existing design spin at 60K RPM is due to material stress limitations.
Now, going from 60K RPM to 144K RPM will mean that for the same mass and the same diameter, the material of the rotating mass will have to withstand 6 times more the tensional stress!
Unless they show what type of material they are going to use with a proper tensional analysis at 100K RPM and 144K RPM, than this article is pure vaporware.
A society of dogmas is a dead society.

KitemanSA
Posts: 6114
Joined: Sun Sep 28, 2008 3:05 pm
Location: OlyPen WA

Re: Flywheel energy storage

Postby KitemanSA » Tue Aug 09, 2016 9:26 am

They are still high power, low energy storage devices.

ladajo
Posts: 6204
Joined: Thu Sep 17, 2009 11:18 pm
Location: North East Coast

Re: Flywheel energy storage

Postby ladajo » Tue Aug 09, 2016 12:07 pm

The reason why most existing design spin at 60K RPM is due to material stress limitations.
Now, going from 60K RPM to 144K RPM will mean that for the same mass and the same diameter, the material of the rotating mass will have to withstand 6 times more the tensional stress!


Yes! And, this has not changed since the last time we went down this path here.
The development of atomic power, though it could confer unimaginable blessings on mankind, is something that is dreaded by the owners of coal mines and oil wells. (Hazlitt)
What I want to do is to look up C. . . . I call him the Forgotten Man. (Sumner)

Carl White
Posts: 312
Joined: Mon Aug 24, 2009 10:44 pm

Re: Flywheel energy storage

Postby Carl White » Wed Aug 10, 2016 12:07 am

Giorgio wrote:Unless they show what type of material they are going to use with a proper tensional analysis at 100K RPM and 144K RPM, than this article is pure vaporware.


Could it be some combination of graphite/carbon fibers and something else to provide the magnetism?

Meh, I guess PowerTHRU is already doing that.

KitemanSA
Posts: 6114
Joined: Sun Sep 28, 2008 3:05 pm
Location: OlyPen WA

Re: Flywheel energy storage

Postby KitemanSA » Wed Aug 10, 2016 7:11 pm

RPM is actually immaterial. It is tangential velocity that matters. The tangential velocity is limited by either the specific velocity or the characteristic velocity depending on the strong direction of the fly wheel. And the energy storage is proportional to the tangential velocity squared. The only things that will improve energy storage is greater specific velocity, or a system to provide radial force without drag.
Check out the Launch Loop for a way to get very high velocity without very high strength.


Return to “News”

Who is online

Users browsing this forum: No registered users and 4 guests