Here are some photos and a video of the workshop. We built a 4200 recipe machine with 48-V battery charging output and a new design of 2 metre, 24-V turbine with ferrite magnets.
I designed a simplified frame similar to the recipe frames for midsized turbines. The bearing mounts are in the same plane as the stator mounts and the alternator welds directly to the yaw tube.
The big 4.2 metre diameter blades were a lot of work, even in lovely red cedar. Thanks to Eirbyte for this nice photo of Luciana.
The casting has a wide lip to include room for a loop of steel wire reinforcement. it also makes it easy to hold during assembly and removal.
There are 9 coils with 100 turns of 1.5 mm wire in each for this 24-volt turbine. Actually we could have got away with fewer turns and a smaller air gap.
Jamming 12 ferrite magnets onto a 300mm disk. This is a new style of construction for me.
Jimmy and Miriam of Eirbyte chat with the folk from Sligo institute of technology
Eirbyte have some classy vehicles although most are a bit old…
12 coils and 9 magnets in the classic 3-phase pattern but the coils need to be a different shape when you pack magnets in tightly like this…
I am experimenting with a new approach to blade carving where all of the measurements are made from the back instead of the front. Otherpower have done this a few times and Max in Germany has made a video about it too.
These were the spacings they measured between the tips of the big blades on the first attempt to set them equally far apart. As the differences were only one millimetre they decided to leave them alone!
Key people: the cook and man from Eirbyte
the witch rides high
This is the wheel hub for the small turbine. We used the 10 mm screws to mount it.
My latest coil winders have a hole for an extra pin or nail. The wire goes under this for the first couple of turns and then we pull it out.
Here is a rotor in its mould. Stainless wire holds the casting together. There is no lid to this mould.
The tail vane is a witch on a broomstick thanks to Luciana
I live off-grid in NW Scotland and have spent my life playing with wind turbines. I also love small hydros. Hands on renewable energy is my thing and I like to learn and to share my experiences.