Hi All,
I'm going to try a stepper motor for a tiny 12 volt generator.
There seem to be a lot of choices.
I would love half an amp at 13 volts. Definately a Vertical, possibly Sandia Savinous Bucket idea (15"w x 30"-ish high, halves of 8" thin wall PVC). We don't get much wind. I expect the top to be 7' high (10' 4x4, 7' up, 3' underground). I don't expect much efficiency. I'm sure those dimentions are too large or too small.
Somebody will ask, so...
Automatic speed control will be taken into design parameters by means of catastophic failure. It'll blow up.
Not looking for magic, just something that has a better chance of working the first time.
Do I want a 12 volt motor, or would 24 or 30 volts be better? Better meaning 12 volts at a lower speed.
Do I want a high current motor? Heavier windings, magnets, etc., and also maybe meaning better low wind output.
Do I want a large or small step degrees? I found 1.5 to 20 degree steps.
How will these choices affect cogging? Minimal concern on this, it's windy or it's not around here.
I was leaning to 24 volt, 800ma, 7.5'.
- v because it should get to 12v at a lower speed.
- ma to carry all it can make, and possibly make a little more.
- 5' because the fields cross twice as fast as 15'.
(FYI- I found a 90V DC stepper. Also, GIANT steppers are being used in some new washing machines. That could be interesting when they start making it to the curb or dump. Maybe thats the "P&B" style?)
Maybe I'm way off track on this. Need pointed in the right direction.
Many Thanks,
G-
