Using PSPICE to model magnetic hysteresis

Are you reading the reference guide? I don't see "alpha" there.

...Jim Thompson

Jim,

It's ture that the reference guide of pspice uses four parameters: Ms,A,C,K as pspice does. And it says that this is based on Jiles-Atherton hysteresis model. But if you read the original paper from Jiles-Atherton, for example, D.C.Jiles, D.L.ATHERTON, Theory of ferromagnetic hysteresis, Journal of Magnetism and Magnetic Materials 61(1986) 48-60 you will find it diffrent from reference guide of pspice.

In original Jiles-Atherton model, there are five parameters with parameter ALPHA.

I think the difference between original Jile-Atherton model and the one in pspice is the way to describe anhysteric magnetization.

In pspice: Man=Ms*H/(H+A) where Ms and A are two of parameters

In original Jile-Atherton model, modified Langevin function is used Man=Ms*(coth( (H+Alpha*M) / a )- a / (H+Alpha*M))

then there is Alpha parameters.

Actually I can get the parameters of some material in the latter form (with alpha), but the difficulty is that I don't know how to reasonably convert them into the form in pspice without alpha

thank you, Jim

Richard

I'm not a magnetics expert, but can't you "fit" the PSpice equations to the original Jiles-Atherton.

Or build your own subcircuit using behavioral modeling?

Last night, in a fit of exasperation with libraries in HSpice "crap" format, I developed a resistor subcircuit that will take HSpice parameters directly and then clean it up to PSpice RES model equivalency, without me having to do the conversions manually every damn time :-(

...Jim Thompson

Definitely not an expert in magnetics, that was Brian. I do know that there were some definite deficiencies in the Jiles-Atherton models in PSpice, which is why in the latest versions they now have a magnetics model editor and some new models. For 9.2, you just have to work with what you have, or go looking for some of the ABM models for magnetics out there...

Charlie