Last week I posted a tiny turbine that spins real fast. My first tests of the alternator were not to successful to say the least. The first magnet disk fragmented as it approached 35000 rpm. No one was near the unit and there was not much left of it after the stress failure.
This is where I tell those who are working in this experimental field. Danger! Do not attempt this at home.
So I have slowed the alternator down. This is what I call the Axial Flatpack. It is made from crashed compact harddrive magnets.
The unit runs at a maximum of 18000 rpm and at that speed it puts out ~ 300 Watts ac. The magnets are set into a 1/8 " aluminum plate. There is a magnetic stainless steal plate bolted on behind the magnets. The disk was then balanced.
The coils were wound on this plastic jig. This allowed very even spacing of the three coils that have 36 turns of 21 guage wire. Also the coils were connected together to reduce connections.
This picture shows how the jig allows the coils to fit together. They are tapped in place on a 1/16" epoxy board cut with the same form.
The hub was made from and old VCR head. They are easy to machine and very accurate. Speed over voltage curve testing will be done next week and then I can decide how to couple the turbine to the alternator.
Joseph. |
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