I did a tour on Wikipedia, not easy for everyone
What level of knowledge do you have?
Submit
the links of what you have read and understand to help you by answering precisely what you have read? In particular that of starting turbine corresponding to your choice of magnets and coils.
is this one? :
http://www.windstuffnow.com/turbine%20kit.pdfThe magnets and coils are not round.
There is also :
https://www.econologie.com/forums/photos-pet ... t9278.htmlIt is also necessary that you take the time to learn the minimum of necessary knowledge, by assimilating courses, concrete first then abstract, otherwise you will remain lost.
Finally, it is in your interest to make a small, not very powerful and inexpensive version with small magnets, of your alternator and wind turbine to better understand the difficulties without losing money in expensive errors.
vertical wind turbine making 1,5tours / sec maximum.
wind turbine with 9 coils of 55 to 70 turns and 12 magnets in front of and behind the epoxy disc of the coils and in opposition ++ -.
I saw that the result was 13v after rectifier on the three-phase winding, for a wind of 8,5km / h.
Dimension of the round magnet: 4cm in diameter * 1cm
Magnetic force: 13000 Gauss
Coil dimension: 5cm of outside diameter; 2cm int diameter; 1,5cm high for 2mm section wire.
Distance between coil and magnet: 1cm
Rotation speed: 1,5 rpm
Desired output voltage: 50v
I originally thought of 18 coils and 24 magnets.
Your number of turns which fixes the tension is for these dimensions of 1,5cm by (5-3) / 2 = 1,5cm and wire of 0,2cm in diameter of (1,5 / 0,2) ^ 2 = 56 max so well wound with great care.
Your formula on forum (from Faraday in 1831) is the same as that on Wikipedia from Faraday and which I put into words:
the voltage induced by turn proportional to their surface multiplied by the speed of the change of the field
A minimum knowledge of the units is required:
The field is in 1 Tesla = 10000Gauss
the surface is in m2.
The magnet must be as close as possible to the coil, since the field decreases quickly outside the magnet, like the cube of the distance as soon as one is a little far from its radius.
The outer coils of the coil are a little far from the magnet 1 + 1,5 = 3,5cm compared to the radius of the magnet 2cm and therefore the field seen by these coils is reduced compared to the field 1,3 Tesla on the surface of the magnet (to be checked).
Since there are several fields in the magnets, put the link giving the full characteristics of your magnets, otherwise risk of error on the value.
The surface S is the surface given by summing the surface of each turn of the coil passing from 2cm inside diameter to 5cm outside diameter.
The corresponding integral gives an effective coil diameter of 3,6 cm between 5 and 2 cm.
The speed of change is that of change of the field seen by the coil when the magnets move in front.
As your magnets are mounted in opposite directions one after the other probably the tension period is that of the passage time of 2 magnets.
Your speed of 1,5t / s requires for the frequency of 50Hz 33 pairs of magnets as you have calculated, ie 66 magnets. Given the three-phase the number of coils must be a multiple of 3 and with 4 magnets for 3 coils of the three-phase, the number of magnets must be multiple of 4, which is not the case with 66, for the arrangement of these magnets are the same for each trio of coils, so as to have induced voltages in all the coils of the trio of three phase in identical phase.
So the closest to 66/4 is equal to 16 or 17 and the number of coils is 16x3 = 38 or 17x3 = 51 if you want to keep the number of 4 magnets for 3 coils.
You should have two bands of magnets close above and below the coils as in this alternator:
http://www.windstuffnow.com/main/dual_rotor_turbine.htm
The field on the coils is greatly increased if they are very close.
If we assimilate to a sinusoid this variable field the frequency will be the speed multiplied by the number of pairs of magnets.
Otherwise at 50 Hertz the voltage induced by the effective coil turn will be by taking a magnet field reduced by 1,3 to 1 tesla since the magnets are not against the coils, we obtain:
2xpix50 = pulsation of the 5O Hertz to be multiplied by the field and to be multiplied by the surface in m2 of the whorl with a diameter of 3,6cm, i.e. pix0,018 ^ 2 gives:
2x3,14x50x1x3,14x0,018 ^ 2 = 0,32Volt per turn at 50Hertz!
and for 56 turns 0,32Vx56 = 18Volts peak (to be divided by rac of 2 for effective)
To be multiplied by the number of coils in series for each phase.
But the frequency of movement of the magnets must be 50 Hertz (100 times per second a passage of magnet in front of a coil) to have this voltage.
The number of coils per magnet can be reduced provided that the number of magnets is a multiple of the number of packets by three or trio of coils.
So you can have 9 coils (giving 18Vx3) and for 22 = 66/3 magnets per trio of coils.
Finally it remains to calculate the resistance of your coils to know the resistive losses, wikipedia.
Finally at lower speed it is necessary to increase the number of turns of wire of smaller section to keep the tension (low wind power available), with additional coils and a switch.