| Here's the alternator for the small Savonius I posted a few days ago. I made the coil form from fiberglass reinforced body filler. After I made it I noticed one of the ingredients was a traces of metal that cut my final power slightly. To bad the body filler worked really well,was cheap and is quite strong. I'll have to see if I can find one without metal.
Everything can be made on a Sherline size lathe I believe although my lathe is larger. I did wind the coils on the Sherline though. To get the coil form accurate and allow the gap to be as small as possible I cast small mounting posts in the core(you can just see them in the photo). This permitted me to have a core exactly .180"(4.5mm) thick as the posts keep the plate at the right thickness when the weight is placed on them while curing. The slight ripple in the core is from waxpaper. The hubs are ABS and contain 1/4"(6.35mm) ball bearings. To mount the small round magnets I machine the aluminum plate in the picture and placed a steel plate behind it. The steel plate keeps the magnets in and the aluminum front plate keeps them from flying off.The steel plate also adds to the power. There is no adhesive on the magnets.
Power is about 4 watts.
RobD |
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