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Tiny Steam Turbine | 15 comments (15 topical, 0 editorial)
Re: Tiny Steam Turbine (3.00 / 0) (#12)
by Nothing40 (phattymo (at) gmail (dot) com) on Sat Feb 16th, 2008 at 08:07:07 AM MST
(User Info) http://www.users.qwest.net/~ptaylor/

Hmm,Maybe "skin effect" has something to do with the wire heating up?

http://en.wikipedia.org/wiki/Skin_effect

[ Parent ]



Re: Tiny Steam Turbine (3.00 / 0) (#13)
by joestue on Sat Feb 16th, 2008 at 08:46:32 AM MST
(User Info)

Nope, at 12000 rpm and say 4-6 poles the frequency is 800 to 1200 hz.
A 5.8 mm diameter wire would have its resistance increased by 10% at 1200hz.

EDDY CURRENT is the problem.
We ignore it at 300 rpm because it scales with the square of the frequency.
WXYZCIENCE is dealing with 400 to 900 times the effect at 300 rpm.
those numbers may be off by a factor of 2, but you get the idea.

[ Parent ]



Re: Tiny Steam Turbine (3.00 / 0) (#14)
by WXYZCIENCE on Sat Feb 16th, 2008 at 09:45:21 PM MST
(User Info)

joestue, Yep I also agree with your logic. By using several strands I can reduce the eddy current considerably.
Joseph.

[ Parent ]


Tiny Steam Turbine | 15 comments (15 topical, 0 editorial)

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