Axial Flux Rotar Thickness

2 good places I think you might find this answer already solved could be one the Axial Flux Yahoo group : http://tech.groups.yahoo.com/group/axialflux/

and the fellows over at our competion's blog: http://www.fieldlines.com/

Hope this helps and if there is anything we can provide you with like inverters & such, just let me know.

Get yourself a tall mast & catch that wind !

Best Regards,

Joe Woodall, Managing Partner

Georgia Adobe LP Rammed Earth & Renewable Energy

2395 Bowman Hwy. NW.

Dewy Rose Georgia 30634 USA

www.georgiaadobe.com

Hi, thickness of mild steel ring shall be selected to have 1.5T flux-density (or less if mechanical stability is an issue). Flux density in the airgap (coils) will be near 0.5T if the length of magnets (1 or 2x 0.5") equals the length across airgap. (Near optimum). As half of the flux from the 3"x1" magnet-area is going left and the other half to the right into the mild-steel ring the cross section of the mild-steel ring shall be 3" (to accomodate the magnets) x 1/6" (half the flux from each magnet and three times the flux-density. Best spacing would be near 0.5" Make a trial with three (6 if double sided) magnets and the mild steel "ring" (both sides necessary. Measure the flux density and optimise! Even better will be optimising the magnets: Above comments are thought for alternating magnetic polarity from one magnet to the next. This will be no good as airgap is near optimum at the same value as magnet thickness. With this you will loose a lot of flux. So if only magnets at only one side of the coil then airgap should be near 0.5", if at both sides (better) then airgap should be 1". Circumferential extension of magnets per pole shall be 3times the airgap or more. So it will be a good idea to put 5 to 10 magnets in north-oriewntation and then the same in south-orientation. This will be pretty difficult and you will need a strong and stiff mechanism to achieve this. The magnets do not want this position. I had some marked difficulties to bring only 2kg of SmCo magnets into adjacent collumns with equal polarity. Any size above 1 cubic centimeter of these magnets shall be considered as maybe dangerous. Best: post a rough drawing then it is much easyer to comment or add dimensions. RHABE

Rhabe thanks for your input. You are way ahead of me in this technology. If I gave you my email address could you send me some sketches. I have auto cad if that helps.

Question; how do you measure flux density in mild steel