Search found 40 matches

by omblauman
Wed Apr 14, 2021 1:31 pm
Forum: Stirling and "Hot Air" Engine Forum
Topic: LTD magnetic vs gamma
Replies: 95
Views: 22093

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...
by omblauman
Sun Apr 11, 2021 2:01 pm
Forum: Stirling and "Hot Air" Engine Forum
Topic: LTD magnetic vs gamma
Replies: 95
Views: 22093

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...
by omblauman
Sat Apr 10, 2021 2:11 am
Forum: Stirling and "Hot Air" Engine Forum
Topic: LTD magnetic vs gamma
Replies: 95
Views: 22093

Re: LTD magnetic vs gamma

the principle is exactly the same, alu vs cu
by omblauman
Wed Apr 07, 2021 12:03 pm
Forum: Stirling and "Hot Air" Engine Forum
Topic: LTD magnetic vs gamma
Replies: 95
Views: 22093

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...
by omblauman
Tue Apr 06, 2021 4:20 pm
Forum: Stirling and "Hot Air" Engine Forum
Topic: LTD magnetic vs gamma
Replies: 95
Views: 22093

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.
by omblauman
Tue Apr 06, 2021 12:41 pm
Forum: Stirling and "Hot Air" Engine Forum
Topic: LTD magnetic vs gamma
Replies: 95
Views: 22093

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...
by omblauman
Mon Apr 05, 2021 11:12 am
Forum: Stirling and "Hot Air" Engine Forum
Topic: LTD magnetic vs gamma
Replies: 95
Views: 22093

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.
by omblauman
Mon Apr 05, 2021 6:41 am
Forum: Stirling and "Hot Air" Engine Forum
Topic: LTD magnetic vs gamma
Replies: 95
Views: 22093

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....
by omblauman
Sun Apr 04, 2021 2:11 pm
Forum: Stirling and "Hot Air" Engine Forum
Topic: LTD magnetic vs gamma
Replies: 95
Views: 22093

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...
by omblauman
Sat Apr 03, 2021 7:41 am
Forum: Stirling and "Hot Air" Engine Forum
Topic: LTD magnetic vs gamma
Replies: 95
Views: 22093

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...
by omblauman
Fri Apr 02, 2021 12:36 pm
Forum: Stirling and "Hot Air" Engine Forum
Topic: LTD magnetic vs gamma
Replies: 95
Views: 22093

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...
by omblauman
Thu Apr 01, 2021 3:21 am
Forum: Stirling and "Hot Air" Engine Forum
Topic: LTD magnetic vs gamma
Replies: 95
Views: 22093

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...
by omblauman
Tue Mar 30, 2021 1:25 pm
Forum: Stirling and "Hot Air" Engine Forum
Topic: LTD magnetic vs gamma
Replies: 95
Views: 22093

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...
by omblauman
Sat Mar 27, 2021 9:13 am
Forum: Stirling and "Hot Air" Engine Forum
Topic: LTD magnetic vs gamma
Replies: 95
Views: 22093

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" ...
by omblauman
Fri Mar 26, 2021 5:09 pm
Forum: Stirling and "Hot Air" Engine Forum
Topic: LTD magnetic vs gamma
Replies: 95
Views: 22093

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...