"Stirling Cycle" Thermomechanical Generator part 3

[dalemi666]

Please can you explain me if your engine is made in this way, i.e. is the resonant frequency of the two parts (piston/displacer) the same or not ? and more important is there a mechanical coupling between the two ? it is not so easy to understand watching this last video.

Thank you so much for your help,

Best regards,

Emilio.

[dalemi666]

The two systems (piston and displacer) are not connected in any way, and the correct phase angle between the two objects must be created by the pressure changes inside the engine while it is working.

[dalemi666]

Hello, I am an Italian experimenter, I have just built a free piston engine very similar to those made by sunpower & Infinia Inc. but obviously my machine was made at home and is simpler than those machines...

The problem I have is the following: The engine do not work !

I build the engine in a way that the mechanical resonant frequency (mass/spring) of the power piston is exactly the same as that of the displacer mass/spring, and is 56 Hz .

[Stirlingsound]

Hi Cyril. This project has inspired me to try a similar free piston design. Is a snifter valve necessary for this design to work? All the best.

[tube4vigor]

It`s simple and beautiful. Thank you. Regards, Igor.

[barumman]

@tube4vigor Thank you Igor, Cyril

[rickwesson]

I'm very impressed. Looking forward to hearing how you built it.

[33dgeo]

please explain haw Is made the part on the top of the displacer ...

i don,t understand haw work.

 thank you.

[AlBarathur]

This is fascinating. I always wondered why nobody made a Stirling with a metal diaphragm, rather than using a power piston, that way the forces of friction are reduced, while the deformation on the diaphragm with as a spring, so not totally lost ( as in case of friction) One thing I would have done different than you: the magnets I would arrange in a pole shape to reduce the air drag to the max ( although you have some holes in it to reduce resistance). This is awesome work you did.

[barumman]

@AlBarathur Thanks for the kind comments, Happy new year. Cyril :)

[teddybear0504]

@barumman

Is the part on the displacer top end a kind of spring?

[MicrowattVlad]

Thank you, Mr. Barumann for the quick response! Running the engine has become clearer.

For core material, I did not offer a ferrite. Steel here is better, of course, but would make it out of sheet metal to reduce losses. Another question: what is the electric power? I think about 15 watts?

It would be nice more current measure, the number of LEDs does not give an accurate value of power.

But in general - an excellent design! As on principle, as on execution.

[MicrowattVlad]

Thank you, Mr. Barumann! the video I looked with great interest. Perhaps? this is the most successful design in the world of Stirling. I have two questions; 1. Has displacer some kind of stiff mechanical contact with the diaphragm? 2. Are the windings wound on a solid (non-leaf), steel core, or is it some other ferromagnetic material? The solid core must be warmed up in vain at this frequency ....

Vladimir

[jeeplvr2000]

@MicrowattVlad

Possibly ferrite core? It looks like steel to me. The displacer does not contact the diaphragm. The displacer is held in place by the small planar spring attached to the bottom of the displacer. The small planar spring is secured between the hot cap and the gland. There are relief areas cut into the power piston to eliminate contact of the displacer bolts.

[jeeplvr2000]

There is no laminate in this alternator, just a steel core. It was explained to me that it is in the way the coils are wound and wired together in series. As magnets meet the upper coil, voltage is created and current flows to the left and when the magnets meet the lower coils, the current flows th the right. This is acheived by the direction of the windings and how they are wired together. I made a drawing of the current flow but cant post it here.

[Lechoslowianin]

I wish I had tried to charge it to a power receiver

[MilanKarakas]

Excellent!

[jeeplvr2000]

I have to admit, I have been over and over your videos and cant decipher how the generator would alternate current. The videos do not show enough of the coil wiring for me to understand how they are connected. If anyone that reads this can help I would appreciate it.

[barumman]

@jeeplvr2000 I will be putting some more information on my channel in a week or two so I if I were you I would wait and see, Regards Cyril

[jeeplvr2000]

@jeeplvr2000 I have a set of "autocad" drawings nearly complete for this TMG. Thanks Cyril for the inspiration. I am looking forward to more of your videos.

[MilanKarakas]

@jeeplvr2000 Still not ableto decipher how the generator produce AC?

It is quite simple, but yet amazing. There are two electromagnets, each has two coils (with U shaped laminate core). Both electromagnets are connected in series in order to produce target voltage (~12V).

Let's imagine only half of the generator. When N/S upper part of the magnets vibrate, it approaches and moving away from the coils. When say, approaches to such el.magnets, it produce positive cycle, when move away, negative.

[water2gashawaii]

@jeeplvr2000 it appears that the magnets are vibrating between the coils

[jeeplvr2000]

Also, what is the mm thickness of the two springs and also, what is size of the magnetic wire used for the coils and how many turns to make the coils. Sorry for so many questions.

[barumman]

Sorry Not at the moment.  :)

[jeeplvr2000]

@barumman

At 6.07 in the video you show the magnet polarization. You marked two norths on one magnet ant two souths on one magnet, is this correct??

Also what are your planar springs made from? I assume the brass colored spring is beryllium copper but what is the displacer spring material?

[barumman]

@jeeplvr2000 Hi. Yes that is correct as I didn't have a bar magnet long enough to span the pole pieces so I used four small neodymium magnets epoxied to the armature which seems to work OK.

The spring for the displacer is carbon steel which was cut from a carpenters saw and shaped on a rotary table.

[jeeplvr2000]

@barumman Thank you for the information. So you glued two norths together and two souths together to make a NN/SS set of magnets? I have the neodmium magnets and getting two souths or norths together seems impossible. I trying to understand your alternator construction,

Thanks again.

[MilanKarakas]

@jeeplvr2000 That is just wrong viewpoint of the magnet arrangements. Vibrating element serve as magnetic line of forces conductor, so two upper magnets (N left, S right) are connected together via this metal (steel). Two bottom magnets (also N to the left, S to the right) share the same vibrating steel piece to connect mag. lines of force along this element.

It is easier to imagine if you want to move attract magnets or push away - by applying voltage across el. magnets (one pair is upper..).

[jeeplvr2000]

brilliant!!

This is the design I have been looking for. I am not a brilliant designer but I can fabricate well. Cyril do you have a drawing and material list for this engine and generator? I would love to experiment with this design.

Thanks so much for posting these videos.

[simi112]

brillant !

[Stirlingsound]

Thank you.  This is such great work and the craftsmanship, as in all of your videos, is such high quality.

[barumman]

@Stirlingsound Thanks for the kind comments, Cyril

[roidroid]

i am jealous of this craftsmanship :)

[sasafed1970]

Hi Cyril! Thank you for your lessons! I always have your work in my mind when I made my own stirlings. And I learn from you how to explain hard things.

[SolaPazEnergy]

Perfect and brillant work. Congratulations

[UnitedElectric]

Truly brilliant. Best DIY stirling unit I have seen. Annular gap regenerator is a new concept to me. I understand that it is used in cryogenics some. I would like to know how you sourced your planar displacer spring, how you formed teh diaphragm, what materials, etc. and how you formed the flanges on the containers. Unbelievable and inspiring. Any plans to pressurize?

[BetterL8than]

Clean and intelligent craftsmanship, thx

[specallez]

I don't really understand how this works, but nice work!

[IronGoober]

Again, Cyril, amazing work. Is this your own design, or just your own fabrication? I'm confused as to how the displacer moves? Does it just bounce around inside the chamber? And I never saw the regenerator? Or is all the to be revealed in the next video?

[svenp]

Very cool. Does it self start or do you have to 'ping' it?

[barumman]

@svenp  It starts on it's own.

[myfordboy]

The secret is revealed!

[bladeattila]

Really nice work! Congratulation!

And a big respect for this video!

THX!

Blade

[Relojuca]

As always, perfect.

[grantiskov]

Wow thanks Barumman for another great show! Beautiful workmanship.