B(H, T) law: models
Introduction
The models provided are available only for isotropic soft magnetic materials.
The decrease of B(H) characteristics with the temperature is:
- either an exponential decay
- or a decay defined by the user (table of values)
Models for soft magnetic materials
The various models available for the description of soft magnetic materials, whose magnetization behavior is a function of the temperature, are presented in the following table.
| Models for soft magnetic materials (linear approximation) | |
|---|---|
|
Linear isotropic exponential function of T tabulated function of T |
B= μ (T).H |
| Models for isotropic soft magnetic materials (nonlinear approximation) | |
|---|---|
|
Saturation isotropic: analytic exponential function of T tabulated function of T |
B= μ (H,T).H |
|
Saturation isotropic: analytic + knee adjustment exponential function of T |
|
Specific models are also provided (see table below). Their mode of use is presented in § Spatial model / user model
| Magnetic property … |
|---|
| … spatial linear isotropic (μr described via spatial formula) |
| … user (μr described via user subroutine and personal version) |
Mathematical models
The models provided for the B(H) curves, depending on temperature, with exponential decay, are defined by means of:
- the previous models provided for soft materials
- the temperature coefficient COEF(T) based on two exponential functions