I use custom software. We have compared it regularly against COMSOL. What is custom about our software is the wrapper. We use FEMM4.2 for the magnetics, and Calculix and Z88 for different parts of simulating a cone or the spider.
A legitimate COMSOL license is prohibitive to pay for as a small company. We've been running our software since 2018 and designed nearly a hundred drivers since then. Our simulations come out very close to the real article. And we have save the butt of a few errant COMSOL designed drivers as well.
With a bunch of research to create our software we found some interesting information regarding simulations on the Opensource software versus COMSOL. With attention to the input details the answers are identical. The math behind the scenes to create the simulation is identical. The only difference is that FEMM 4.2 simulates in 3D but displays in 2D.
Attachments
Well, if anyone else has already done a deep dive on the various ways of inductance demodulation eg. copper cap on the pole piece to make the voice coil inductance low and symmetric eg. original Philips drivers in the market by 1973, Ragnar Lian SD patent 1973-1993, vs 3 copper rings (Ragnar Lian’s patent for “SD-1” in 1994-2014), 2 copper rings eg. SEAS’ old Excel, vs 1-3 alu rings or 1-3 rings of variable resistivity eg 2 alu, 1 copper eg. KEF
And/or effects of current drive on them, I’d like to hear about…
And/or effects of current drive on them, I’d like to hear about…
Last edited: