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questions about magnets
By devoncloud, Section Homebrewed Electricity Posted on Sat Mar 13, 2004 at 05:13:29 PM MST
magnet questions

I listed this in a diary, but not sure if that will get an answer, so I am posting it under this topic.
I am building a wind generator using hugh's new book, and he calls for NdFeB grade 35. While doing research on magnets, I came across grade n40. Would this make a difference? would it help me or hurt me as far as power creation? Does grade n40 have problems with overheating and loosing it's magnetic properties? Are there magnets out there that will produce more electricity than the ones hugh has suggested?
Thanks,
Devon

questions about magnets | 3 comments (3 topical)

Re: questions about magnets (none / 0) (#1)
by RobD on Sun Mar 14, 2004 at 07:40:42 AM MST

Grades
I quote:
"The grade of a magnet directly refers to the Maximum Energy Product of the material that composes the magnet. It in no way refers to the physical properties of the magnet. Simplistically, grade is generally used to describe how "strong" a permanent magnet material is. The energy product is specified in the units Gauss Oersted. One MGOe is 1,000,000 Gauss Oersted. A grade forty (N40) would have a Maximum Energy Product of 40 MGOe. The higher the grade the "stronger" the magnet."
RobD

Re: questions about magnets (none / 0) (#2)
by DanB on Sun Mar 14, 2004 at 07:56:28 AM MST

you might expect an N40 grade magnet to be 5 - 10% stronger. In practice, it seems like magnet strength can vary between manufacturers even if they are of the same grade.

In the case of Hughs wind turbine plans...
If you used N40 grade magnets, you would probably get slightly higher volts/rpm - which may make the blades stall. To compensate for the stronger magnets, you might be able to use slightly fewer windings of slightly heavier wire and run with a slightly larger prop. Getting all this right might take a bit of experimenting...

My guess however, it the change would be very slight.

[ Parent ]

Re: questions about magnets (none / 0) (#3)
by devoncloud on Sun Mar 14, 2004 at 12:48:42 PM MST

hmm. ok. Looks like it would be more trouble than it is worth. Thanks for your help!
Devon

[ Parent ]

questions about magnets | 3 comments (3 topical)

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