Hi
Is there any pages or videos explaining what sort of combination of magnets and windings you need for a generator to generate the right power, or a sort of formula to work it out?
I want to make my own windings to generate at least 12V 5A DC with minimum torque possible such as a low pressure impeller.
Thanks in advance.
On reading your post, it is not clear that you understand power balances.
For instance, do you understand the following two equations?
1. (Power out) = (Power in) - (Power losses)
2. (Power in) = (Torque) x (Speed)
From the first equation, if you want to generate 12 V at 5 A, that is 60 W. So your low pressure impeller must generate at least 60 watts of power, and more than that if you allow for losses.
From the second equation, if you know the torque of your low pressure impeller, then you know what speed it has to run to generate at least 60 watts. If the torque is low, then the speed is going to be very fast.
You will notice that magnets and windings do not appear in any of these equations. Only after you have answered questions 1 and 2, and maybe considered other mechanical considerations like a gearbox, only then do you start to consider how to design your generator.