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Non-converging oscillation problem of inverse Jiles-Atherton model in LTspice

 

Hi all,

I¡¯m implementing an inverse Jiles-Atherton model in LTspice, mainly based on this paper:

The simulation stops around a quarter cycle. It seems to get stuck when "dH/dt" approaches zero ¡ª likely because of? "delta", which is the sign of "dH/dt"

I¡¯ve tried replacing the "delta" with a smooth "tanh" function, but the oscillation and convergence issue still remains.

Any suggestions on how to solve this problem?? I've posted my schematic here: /g/LTspice/files/Temp/invJAmodel_dynamictest.zip

Thanks!
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