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View Diary: Green Light!  Flywheel Energy Storage (228 comments)

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  •  You've got the order backwards there (1+ / 0-)
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    aaraujo

    Magnetic bearings of the type used by Beacon (formerly SatCon) are considerably newer than the filament wound carbon fiber in the structure.

    Just fyi.

    Certainly from our standpoint, this gives us a sense of momentum -- when the United States has accolades tossed its way, rather than shoes. - PJ Crowley

    by nsfbr on Tue Aug 10, 2010 at 07:27:29 PM PDT

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    •  Not as an idea. (1+ / 0-)
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      aaraujo

      You might have noticed that I was referring to the idea of magnetic bearings, not their actuality. I made rather a point of saying that all these ideas preceded any practical application to the problem of flywheels.

      So no, your point is wrong. The idea of non-permanent magnetically suspended bearings (i.e., essentially the same type of active magnetic bearing used in Beacon's flywheels) was first patented in 1941, 17 years before the first patent for carbon fiber.

      Conservito delenda est pro is deleo orbis terrarum!

      by Stwriley on Tue Aug 10, 2010 at 07:44:58 PM PDT

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      •  I know not as an idea. (0+ / 0-)

        I'm not talking about the idea of them.  I'm talking about the actual innovation (to use your word).  While the idea of the helicopter has been around since DaVinci, we don't say that it is a several hundred year old innovation, do we?  Igor Sikorsky might have something to say about that.  

        My comment was in regard to your saying that Carbon fiber structure as an innovation was newer than the innovation of active magnetic bearings in a flywheel.  If one is speaking about them as an actual functioning element in a flywheel, or comparable use, the bearings as they are used in Beacon's device are much more recent than filament wound Carbon fiber structures.  

        Certainly from our standpoint, this gives us a sense of momentum -- when the United States has accolades tossed its way, rather than shoes. - PJ Crowley

        by nsfbr on Wed Aug 11, 2010 at 10:24:22 AM PDT

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        •  You miss the point again (0+ / 0-)

          I was talking about these things as ideas that have been made possible by more recent technical advances, not about their actuality. That was the entire point of my post, about the ideas that have become part of the general innovation in flywheels; otherwise I'd have been simply re-stating the diary, something I don't really bother with a comment for.

          Besides, as all the technical literature points out, high-speed carbon fiber flywheel systems must use active magnetic bearings and have from the start, since any other type of bearing cannot support the high rotational velocity of these flywheels (to say nothing of the difficulty of operating a mechanical bearing in a vacuum.) The reverse is certainly not true, as companies like ActivePower use magnetic bearings but still use steel flywheels in their commercial products.

          Conservito delenda est pro is deleo orbis terrarum!

          by Stwriley on Wed Aug 11, 2010 at 12:49:25 PM PDT

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