An electric generator printed in 3D

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Chris_Workshop
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Re: An electric generator printed in 3D




by Chris_Workshop » 06/01/19, 22:13

The nuclei somehow allow to guide the magnetic flux which does not have the same shape if they are not there. Suddenly, the induction is stronger in the coils and therefore there is more current produced for the same regime with cores than without.
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Petrus
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Re: An electric generator printed in 3D




by Petrus » 06/01/19, 22:46

I understood their interest, I just wanted to have a comparison with / without cores to see if I could do without it to reduce friction.
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Chris_Workshop
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Re: An electric generator printed in 3D




by Chris_Workshop » 17/01/19, 22:46

And of course, I will be able to make you a comparison with and without cores. I thought mild steel cores would work, but it didn't. Very quickly the generator lost efficiency. Almost immediately. At the start it left 40V empty at 1300 rpm but very quickly it went down to 24V then last to less than 6V. In fact the nuclei have become magnets. So use pure iron. I found some in the form of bars and I ordered some. I will also try another method by making it with iron filings mixed with epoxy glue. In the meantime, it has been able to make a nucleus and it does not come out much. Just over 4V when empty. However it still just lights the lamp. In the 2W at 1300 rpm. Not terrible.
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Re: An electric generator printed in 3D




by Petrus » 17/01/19, 22:56

40V with cores and 4V without, it does make a hell of a difference!
Otherwise, for the cores, we could use a ferrite rod as found in AM radios.
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izentrop
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Re: An electric generator printed in 3D




by izentrop » 18/01/19, 11:00

Chris_Workshop wrote: I thought mild steel cores would work, but it didn't. Very quickly the generator lost efficiency. Almost immediately. At the start it left 40V empty at 1300 rpm but very quickly it went down to 24V then last to less than 6V. In fact the nuclei have become magnets. So use pure iron.
It's not soft iron then : Wink:

An example of a 600 W axial generator at 100 rpm https://greenterrafirma.com/AXIAL_FLUX_HowItWorks.pdf
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Re: An electric generator printed in 3D




by izentrop » 18/01/19, 13:39

Chris_Workshop wrote:The nuclei somehow allow to guide the magnetic flux which does not have the same shape if they are not there. Suddenly, the induction is stronger in the coils and therefore there is more current produced for the same regime with cores than without.
It is valid in a transformer where we must lose the least magnetic flux. The magnetic circuit is made of laminated soft iron, isolated between each sheet to limit losses by eddy current.

For an axial flow generator, what matters is that each wire is traversed by a maximum of magnetic fields, therefore as close and perpendicular as possible to the magnet.
Coils as flat as possible and as trapezoidal as possible, such as here (albeit on non-magnetic support) but flatter or with magnets on both sides like the previous pdf.
Magnets rather rectangular than cylindrical, see trapezoidal, whose magnetic field is perpendicular to the wire which crosses its magnetic flux.

Adding a magnetic circuit only brings a brake to starting the wind turbine.
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thibr
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Re: An electric generator printed in 3D




by thibr » 18/01/19, 18:23

at 9:00 a.m. there is an interesting test on the eddy currents
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Re: An electric generator printed in 3D




by izentrop » 18/01/19, 23:49

thibr wrote:at 9:00 a.m. there is an interesting test on the eddy currents
Yes, too bad he had a superb foundry demonstration :)
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Chris_Workshop
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Re: An electric generator printed in 3D




by Chris_Workshop » 02/02/19, 18:46

The second episode:

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