Search found 40 matches
- Wed Apr 14, 2021 1:31 pm
- Forum: Stirling and "Hot Air" Engine Forum
- Topic: LTD magnetic vs gamma
- Replies: 95
- Views: 22636
Re: LTD magnetic vs gamma
Our collaboration is getting interesting from a totally unexpected point of view, your way of proceeding is teaching me the quirky logic and extraordinary power of the web in problem solving. APPLICATION NOTE 1947 EXACT CIRCUIT ANALYSIS WITH MICROSOFT EXCEL would help to but I was thinking more at s...
- Sun Apr 11, 2021 2:01 pm
- Forum: Stirling and "Hot Air" Engine Forum
- Topic: LTD magnetic vs gamma
- Replies: 95
- Views: 22636
Re: LTD magnetic vs gamma
"It is not clear to me how the oscillation of current would be sustained, or the capacitor recharged for the next, and succeeding lifts." The oscillator is only electrical, an underdamped RLC circuit. Part, or all, of the current flows also in the circuit which lifts the displacer and part...
- Sat Apr 10, 2021 2:11 am
- Forum: Stirling and "Hot Air" Engine Forum
- Topic: LTD magnetic vs gamma
- Replies: 95
- Views: 22636
Re: LTD magnetic vs gamma
the principle is exactly the same, alu vs cu
- Wed Apr 07, 2021 12:03 pm
- Forum: Stirling and "Hot Air" Engine Forum
- Topic: LTD magnetic vs gamma
- Replies: 95
- Views: 22636
Re: LTD magnetic vs gamma
It needs to be safe, i.e. less than 100 V fully charged, and reasonable size, physical size is proportional to energy , my guess is that this would be ideal Untitled.jpg All cables at least like 1 mm diameter of total x-section, the cable from capacitor to L1 twisted, better if L1 is a few turns, L2...
- Tue Apr 06, 2021 4:20 pm
- Forum: Stirling and "Hot Air" Engine Forum
- Topic: LTD magnetic vs gamma
- Replies: 95
- Views: 22636
Re: LTD magnetic vs gamma
If you want to test the induced current repulsion scheme the simplest way would be to discharge a capacitor into a loop and see a second short circuited 1 turn loop jump up. I have never seen it in practice, it's a prediction.
- Tue Apr 06, 2021 12:41 pm
- Forum: Stirling and "Hot Air" Engine Forum
- Topic: LTD magnetic vs gamma
- Replies: 95
- Views: 22636
Re: LTD magnetic vs gamma
You can calculate the induced current by putting the shared flux to zero and then letting it decay according to its L/R time. It's actually electromagnetism textbook stuff, the classic way of dealing with it analytically is by calculating energies through self and mutual inductances and then gradien...
- Mon Apr 05, 2021 11:12 am
- Forum: Stirling and "Hot Air" Engine Forum
- Topic: LTD magnetic vs gamma
- Replies: 95
- Views: 22636
Re: LTD magnetic vs gamma
I have never seen anything like it too, I was basing my intuition on flux conservation and the overall magnetic energy decreasing with the coils separating, reduction in mutual inductance if you want. In terms of forces flux conservation means opposite currents and opposite currents repel.
- Mon Apr 05, 2021 6:41 am
- Forum: Stirling and "Hot Air" Engine Forum
- Topic: LTD magnetic vs gamma
- Replies: 95
- Views: 22636
Re: LTD magnetic vs gamma
The first video you sent is super interesting and the model shown is pretty sophisticated, worth understanding in depth. "Just out of curiosity, or perhaps ignorance based skepticism, I don't think I've ever seen an example of any such repulsion from an induced current such as you've described....
- Sun Apr 04, 2021 2:11 pm
- Forum: Stirling and "Hot Air" Engine Forum
- Topic: LTD magnetic vs gamma
- Replies: 95
- Views: 22636
Re: LTD magnetic vs gamma
" Looking up "current decay time constant" doesn't really help me. What is the consequences of that being insufficient? Insufficient to accomplish what?" My thinking was that the oscillator circuit of which L1 is part would have induced a current in the short circuited coil of th...
- Sat Apr 03, 2021 7:41 am
- Forum: Stirling and "Hot Air" Engine Forum
- Topic: LTD magnetic vs gamma
- Replies: 95
- Views: 22636
Re: LTD magnetic vs gamma
what looks to me the most original, least known component of such an engine is the displacer so I would start analyzing its properties first. The drawing shows a typical LTD foam displacer contained in its clear plastic box, circled by a metal band, L2, to push it up from the box outside with the dr...
- Fri Apr 02, 2021 12:36 pm
- Forum: Stirling and "Hot Air" Engine Forum
- Topic: LTD magnetic vs gamma
- Replies: 95
- Views: 22636
Re: LTD magnetic vs gamma
the RLC oscillator basics are here: https://en.wikipedia.org/wiki/RLC_circuit#:~:text=An%20RLC%20circuit%20is%20an,in%20series%20or%20in%20parallel.&text=The%20circuit%20forms%20a%20harmonic,way%20as%20an%20LC%20circuit. I would start building just the displacer chamber and measure losses in the...
- Thu Apr 01, 2021 3:21 am
- Forum: Stirling and "Hot Air" Engine Forum
- Topic: LTD magnetic vs gamma
- Replies: 95
- Views: 22636
Re: LTD magnetic vs gamma
The goal or intention of reducing the number of moving parts, though may be difficult, as what is less than one? I would also assume there would be a need for some form of condenser/capacitor in the circuit somewhere. What happens if the rate of oscillation changes? More or less heat is applied, or...
- Tue Mar 30, 2021 1:25 pm
- Forum: Stirling and "Hot Air" Engine Forum
- Topic: LTD magnetic vs gamma
- Replies: 95
- Views: 22636
Re: LTD magnetic vs gamma
Un underdamped electrical oscillator is the equivalent of a mechanical pendulum, an oscilator which doesn't loose too much of its energy per cycle. In our case the sterling cycle would compensate for the electrical losses driving a coil and the electrical circuit would provide the inertia normally s...
- Sat Mar 27, 2021 9:13 am
- Forum: Stirling and "Hot Air" Engine Forum
- Topic: LTD magnetic vs gamma
- Replies: 95
- Views: 22636
Re: LTD magnetic vs gamma
... no piston, no flywheel, just a displacer slowly oscillating by itself. ... Is there such a thing? I've seen what I guess I'd call a PISTON oscillating by itself, a typical "laminar flow" running without a flywheel, but just a displacer? Are you talking about a "free piston" ...
- Fri Mar 26, 2021 5:09 pm
- Forum: Stirling and "Hot Air" Engine Forum
- Topic: LTD magnetic vs gamma
- Replies: 95
- Views: 22636
Re: LTD magnetic vs gamma
According to me to be an efficient generator the engine needs to be self oscillating free piston, very different from a conventional magnetic LTD with a work piston going up and down carrying a small magnet, the same for a record low temperature LTD, no piston, no flywheel, just a displacer slowly o...