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Forum Index : Windmills : Predicting steel rotor size

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willib
Newbie

Joined: 24/09/2009
Location: United States
Posts: 14

Posted: 04:39am 17 Nov 2009

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given Round mags and coils,
If you are designing a 9 coil machine using 2" dia mags .
Multiply 2 x 7 and get 14 " dia rotors.

also if you are designing a 12 coil machine using 1.5" dia mags.
multiply 1.5 by 9 predicts 13.5 inch dia rotors.

same goes for a 15 coil machine multiply magnet dia. by 11.

same goes for 18 coils , multiply magnet dia by 13.

Using this method i have been able to predict a very close figure .
The rotors come out a tad on the side of being larger than needed , but not by much..

Can someone confirm this relationship for me using a machine that they have built?

GWatPE

Senior Member

Joined: 01/09/2006
Location: Australia
Posts: 2127

Posted: 06:10am 17 Nov 2009

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Hi willib,

The magnet rotor size on my design comes out at 12inches for 12 2 inch round disks with 9 coils. Power output has been measured at 3kW for a 3m blade dia.

You normally build around what materials are readily available, that all the components will fit to.

Oztules has 14inch magnet rotors on his mill.

Gordon.

become more energy aware

HeadsUp
Regular Member

Joined: 06/12/2009
Location: Australia
Posts: 43

Posted: 11:45am 10 Dec 2009

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does anyone have a chart comparison of volts / RPM and coil configuration for Ax Flx ???

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