Some helpful maths ...
These calculations are used in wind turbines and may be of some use.
To calculate the average (rectified) DC voltage from a set of coils :
Average DC voltage = A x B x N x ((RPM x 2.72)/30)-1.4
Where :
A = area of magnet face, in square metres.
B = flux density of one magnet, in Tesla.
N = turns per coil x coils in series (so turns per phase)
The 2.72 is because 3-phase is assumed, your average output is raised by a factor of 1.73, plus the peak is higher than the average by 1.57.
To find N, the number of coil turns needed to achieve a specific RPM :
N = (DCV + 1.4) x 11/(A x B x RPM)
This is the total number of turns per phase so would have to be divided by the number of coils per phase to get the number of turns per coil.
Hope these are helpful.
These calculations are used in wind turbines and may be of some use.
To calculate the average (rectified) DC voltage from a set of coils :
Average DC voltage = A x B x N x ((RPM x 2.72)/30)-1.4
Where :
A = area of magnet face, in square metres.
B = flux density of one magnet, in Tesla.
N = turns per coil x coils in series (so turns per phase)
The 2.72 is because 3-phase is assumed, your average output is raised by a factor of 1.73, plus the peak is higher than the average by 1.57.
To find N, the number of coil turns needed to achieve a specific RPM :
N = (DCV + 1.4) x 11/(A x B x RPM)
This is the total number of turns per phase so would have to be divided by the number of coils per phase to get the number of turns per coil.
Hope these are helpful.
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