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Paper on cogging in small turbines
By richhagen, Section Wind Posted on Wed Mar 2nd, 2005 at 11:36:16 PM MST
Discusses methods to reduce torque required to overcome cogging in small wind turbines

A short and interesting paper on cogging in permanent magnet turbines I ran across and though I would share. Rich
http://www.nrel.gov/docs/fy02osti/30768.pdf

Paper on cogging in small turbines | 4 comments (4 topical, 0 editorial)

Re: Paper on cogging in small turbines (3.00 / 0) (#1)
by monte350c on Wed Mar 2nd, 2005 at 07:04:08 PM MST
(User Info)

Thanks Rich,

There's my reading material for tonight!

Ted.

Re: Paper on cogging in small turbines (3.00 / 0) (#2)
by ghurd on Thu Mar 3rd, 2005 at 07:46:32 AM MST
(User Info)

I must be learning something. I understand most of the paper. Not so much the charts on the first read. And I like charts. Maybe it does show the perfect combination of decogging measures for best output, for someone with a better grasp of the situation. (I just did what Zubbly told me to do. Thanks Zubbly)

In the Conclusions section, most of it has a familiar sound.
Pole shape- Like decogging a F&P?
Pole arc to pitch ratio- Like Zubbly and others explained?
Skewing- Well, skewing!
Skewing is hard- I didn't think so.

G-

Re: Paper on cogging in small turbines (3.00 / 0) (#3)
by richhagen (richhagen (a t) Juno.com) on Thu Mar 3rd, 2005 at 04:03:07 PM MST
(User Info)

I thought it was funny that they concluded that skewing was more expensive to implement into a design as well. Rich
'A Joule saved is a Joule made'
[ Parent ]

Re: Paper on cogging in small turbines (3.00 / 0) (#4)
by ghurd on Thu Mar 3rd, 2005 at 04:26:09 PM MST
(User Info)

I recently overly turned down an induction rotor. It fell apart (knew it would, just not so soon).
Closer looking showed that really is a pretty complicated device.
I too can't believe skewing a magnet would be expensive compared to the regular old rotor manufacturing.
Maybe a twisted and curved magnet is too expensive, but I thought neo's could be sintered, and I thought sintering was cheap. I don't know....
G-

[ Parent ]

Paper on cogging in small turbines | 4 comments (4 topical, 0 editorial)

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Related Links

· magnet
· http://www.nrel.gov/docs/fy02o sti/30768.pdf
· Also by richhagen

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