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hole size in air core coils, o'scope reveals all... | 18 comments (18 topical, editorial)

life is complex (none / 0) (#11)
by troy on Fri May 23rd, 2003 at 10:32:27 AM MST
(User Info)

Yes, it gets complex and compromises have to be made. Here's another way to look at these results: We are seeing what contribution each layer of a full coil actually makes. I think the final wave form from a full coil is the result of the average diameter of the coil versus the magnet to magnet spacing, just as you describe. But the real take home message is that you do want some hole in the coil, bigger hole being somewhat more efficient (in volts per inch of wire so to speak) but smaller hole giving higher total output up to a point.

I'm with you, I want the coils bigger than the magnets, so some space between magnets, but not 50% space.

And just to clarify, you're still doing single phase with the same number of magnets and coils, or is this three phase with less magnets than coils or something else entirely? I eagerly await output numbers on your latest project.

Best Regards,

troy

Assumtions can be fatal (none / 0) (#12)
by Dave B on Fri May 23rd, 2003 at 12:23:27 PM MST
(User Info) http://www.madbbs.com/users/bruggelog

Great work from all you guys out there and with the scope comes a sense of certainty but .... It is very time consuming for sure to build a complete scale "unit" for testing but watch what happens. I think Dan is seeing it and Troy besides. Things don't always add up or react the way it is assumed they will when testing a single coil or 2 and then just filling in the blanks on paper. Add up the coils yes but I think what we are all hitting on is the "time" or frequency factor which relates directly to the spacing / magnet / coil size relationaship. Again it's all what you need for your application. If a clean wave at a certain voltage / speed is important then shoot for it with the "ideal" spacing, size etc. (I'll call it Ed's clean machine) Some of us less fortunate who have been working with meters can see (measure) a higher output at the same given speed by packing in the coils and magnets, not as clean or ideal electrically but if it fits your own application it maybe a more efficient "bang for your buck"(thanks Dan) especially at a lower windspeed. What a great collection of knowledge here and I am having fun which is most important to me. Thanks guys, Dave B.

[ Parent ]

hole size in air core coils, o'scope reveals all... | 18 comments (18 topical, 0 editorial)

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