LTspice models for bifilar coils

[ayeaye]

Computer Aided Engineering (CAE), and in particular some of the newer more advanced versions, can all but replace "early version" physical prototypes thus providing great savings in wasted time and cost.

SolarLab, i'm a programmer, i'm all for using software, apparently more than others here. But i'm not for replacing physical research with software. I'm for using software to aid physical research.

[SolarLab]

Ayeaye, FWIW - seen some of your work elsewhere - impressive!

Agree that only CAE, without physical builds and verification, would simply keep us at the same point we are
now at. Lots of "speculation" and "cartoons" but no real viable progress, although, I feel an "only CAE"
approach would advance the art a little (maybe a lot) further.

An advanced CAE model, with the math exposed as can be done using a full Comsol analysis, even without
fabricating a physical prototype, would be very instructive (as compared to only a youtube video with a few
lines of explanation and some answered comments). Forum discussions are a bit better but an inter-active
CAE analysis is worth thousands of words and pictures. Modifications are much easier as well.

The combination of a built prototype, measurements and a full CAE analysis I believe is the ultimate approach
and probably the only one that will yield any useful results. I've seen a few builds (prototypes) that actually
work but I'm still non-the-wiser as to how or why they function. Without that piece of the puzzle it's extremely 
difficult to replicate, improve on them or advance the concept.

But I will say the ongoing CAE analysis of a so called "grenade coil" appears to be revealing many things that are
otherwise not apparent, or discoverable, with only the physical model to work with.

Another bonus surfaces when your CAD/CAM/CAE design uses CNC fabrication - the G-Code is provided [coil winding,
PCB, fixtures, etc.]. Plus when you need to look at environmental or mechanical elements or effects. You can simulate
these without an environmental chamber or shake table.

Then again, just my learned opinion based on experience. 

SL

[F6FLT]

...
Comsol allows you access to the formulas used in the analysis - you can edit these which is an
extremely huge deal; especially when considering any newly discovered anomalies!
Cost/benefit is pretty good (lots of demo and student deals) and computer requirements are
somewhat viable (or use networked cloud arrays for really complex designs). Overview:

https://www.comsol.com/video/first-look-comsol-multiphysics
...

I knew Comsol by reputation but I am often afraid of how long it takes to master a CAE software. This one seems very complete, so I was doubly afraid and didn't try it. May be I'm wrong.
SolarLab, or someone else, have you used the software and do you have any feedback?

[ayeaye]

F6FLT, i think you cannot model overunity with a simulator, and i think the reason for that is that for overunity the induced current has to be greater than conventionally given by the rate of change of the magnetic flux.

We cannot know where the overunity is, but we might know where it isn't.

[F6FLT]

F6FLT, i think you cannot model overunity with a simulator...

I know that and said it before. Remember the "Note to the skeptics" here:
https://overunity.com/17988/ltspice-models-for-bifilar-coils/msg526601/#msg526601

In fact we cannot search for overunity with a simulator but we can model it once we know that we get it experimentally and where extra energy comes from (even in LTspice we can input energy in a circuit by putting the appropriate mathematical equation to the appropriate parameter).