Linear Generator for thermoacoustic Stirling engine – how to get most power from magnets and coils ?

In this video I show my attempts to produce a high-performance linear generator for the new TASLiCE thermoacoustic Stirling engine using a 3D printer.
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Thanks to Baptiste (alias OfficialyMax) we now have a Discord server:
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It would be very nice if we could discuss there everything about Stirling engines, thank you very much Baptiste.

My goal is to achieve the best possible electrical performance using simple magnet and coil geometries.This allows meaningful performance comparisons for the further development of the engine and cheap elecricity to go off grid.I'm grateful for any help in the comments and on Discord!For a linear generator you need magnets, coils and a movement of the two in relation to each other.As I want to make the whole thermoacoustic Stirling engine as easy to rebuild as possible, the linear generator will also be produced mainly with the 3D printer.The basic concept of a linear generator is very elegant, but if higher performance and efficiency are possible by relative simple means, remains to be seen.I also tried a conventional slider-crank gear, but found it complicated and not very elegant.The coil body should hold four coils of approximately 1000 windings each, which are connected in series.The magnets will later move through the inner diameter and the distance to the coils should be as small as possible.I print all parts in PETG, but will soon be trying carbon fibre-reinforced technical filaments for highly stressed engine parts.The enamelled copper wire is only 0.2mm thin and I have to be very careful not to break it.The magnets are bolted to the piston rod with the exact spacing of the magnet width, and the width and spacing of the coils also match the width of the magnets to minimise phase cancellations in the series connection.This means that all four coils can be connected directly in series and then rectified.Perhaps it would be more effective to align each coil separately to avoid phase cancellation, what do you think?The generator works very satisfactory and delivers up to 3 volts AC.It is still very underpowered and I probably won't be able to avoid using iron cores for higher values.I would be grateful for any suggestions on how to increase the electrical output significantly using relatively simple means.For accurate power measurements, I need to complete the rest of the electronics, such as rectification, smoothing and current and voltage measurement.I think a lot about how to make the electric linear generator more powerful.I already have stronger magnets and can wind larger coils, but I don't think high performance is possible without the use of iron cores.These usually require a complicated and heavy coil and magnet construction, which I would like to avoid.This leads to the next problem, the balancing of the ever larger and faster moving masses, which can probably only be solved by the complex coupling of a counterweight running in antiphase or by a multi-cylinder engine.I'm grateful for any help from you and look forward to your suggestions and comments here on Youtube and on Discord.
Thanks for watching!