pulsogenerator 50hz 2 cm3 4 inches long

Small "engine" with 2 cm3 on the cold side (2 inches long) and 2 cm3 on the hot side (2 inches long).
Petit stirling de 2cm3 coté froid et coté chaud, 8 cm de long au total,
The grey part is the aluminium sleeve (cold source) that prevent the seringe from to much heat
La chemise alu fait office de source froide
One fixed entry at 50 hz is used as a bench mark on the scope.
Une entrée fixe à 50hz permet une comparaison.
Can someone help me: why did we get a "half frequency, twice amplitude" sine wave when the coil is not properly located?
Qui peut m'expliquer la sinusoide de double amplitude et fréquence moitié obtenue lorsque le solénoide est mal placé?

Category:

Science & Technology

Tags:

• moteur
• stirling
• engine
• pulsogénérateur
• pulsogenerator
• thermoaccoustic
• yves
• le
• corfec
• chp

[lecorfec]

Thanks!

What were the characteristics of your coil?

I guess both the number of turns, length of coil and moreover the void between magnet and inner diam will have a great incidence... The coil there is a 8W 220 V 600ohm (a specialist could probably guess the number of turns).

I believe there is too much space between magnet and inner diametre...

[mjdevink]

But then I just watched again with the volume turned up higher, can't hear any change in pitch, so perhaps it is not running at 2nd harmonic. I hope there are some more ideas posted by others. -Mike

[lecorfec]

the pitch is changing when the coil is put in place but the decrease is 10% more or less... The coil is a "220V 8W Lucifer Coil" swiss made but I don't know if it is the appropriate characteristics!

Thanks again for watching and for your beautiful engines' videos.

[lecorfec]

I bought a handfull in a flee market, unfortunately most of them except 2 are "12V rated and then inapropriate. I try to find a way to wind 5000 loops easely with 15/100 wire

[mjdevink]

Thanks for your comment in reply, however the compliment on the beautiful engines should go to Jos de Vink. We have a similar name, but I have not built anything interesting yet.

[mowerofdoom]

Have just replicated your setup. Used a motor, flywheel, reciprocating magnet, coils(2 different). Effect is from magnet/coil position. Trace is 'cleanly' double freq when magnet oscillates centred on coil. The field lines around the magnet exit on the leading face, spread around the outside and re-enter the back face. Only leading lines travelling outwards cut the coil first (+) then both (0V) then trailing lines only (-) then it reverses direction +,-. Sound plausible? Nice sig gen btw.

[mowerofdoom]

Nice work. Very interesting. Lots of thoughts but not enough space in this little box to write them all down!!

I will dig out my MkIV engine and try to repllicate your work this afternoon.

Back soon!

[mjdevink]

Very interesting. My guess at answering your question is that the natural resonace with the magnet outside the coil is 25hz with a longer amplitude of oscillation. When properly located within the coil the magnetic induced load dampens the amplitude and the system settles to a second harmonic, twice as fast but half the amplitude. Great Work! -Cheers Mike

[SWINGREGORY]

cool