Electronics > Projects, Designs, and Technical Stuff

Making an induction motor go crazy fast.

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Yansi:
Fan torque goes up square wit rpm.

On thw other hand no problem removing it ;)

Ian.M:
What about hydrogen cooling (as used by *BIG* generators)?   That should reduce the windage losses by an order of magnitude.   

Safety may be a bit of a problem, :scared: though if you can set up for CCTV monitored remote operation outside, including running an inert gas purge before opening the hydrogen valve, and again on shutdown before approaching it, and put the business end of the rig in a pit in the middle of a field to direct any blast upwards, with the hydrogen cylinder and any more delicate test equipment behind a berm nearby, a good distance from the operator's bunker, you should get away with it.  >:D

Yansi:
Big generators have the hydrogen inside the hollow copper bars used as the windings. Not in the entire machine.

Gyro:
No, the big turbo-alternators, at least the ones old enough to be in my old electrical engineering books, run/ran pure (obviously) Hydrogen in a closed circuit to reduce turbulence losses and due to its higher specific heat capacity. There were all sorts of precautions, purging procedures, oil labyrinth shaft seals to protect against air leakage.


EDIT: Actually, on referring to the books in question (The Modern Electical Engineer, Arthur Arnold, Caxton press published 1927) they were only being run on an experimental basis, I don't know what happened after that. Hydrogen has a specific heat capacity 14 times that of air - and of course the much better windage losses due to much lower density as I mentioned.

Yansi:
They run hydrogen just inside the winding. No doubt about that.

Never heard of any use of hydrogen for such dangerous purposes in any practical generator, currently being used. Having hydrogen within the whole machine would be more than impractical.

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