List of models for hard magnetic materials
Models for hard magnetic materials
The various models available for the description of hard magnetic materials (permanent magnets) are presented in the following table.
Anisotropic material: linear approximation
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|---|---|
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Linear magnet described by the Br module Linear magnet described by the Br module, with Br linear function of the temperature |
unidirectional |
|
Linear magnet described by the Br Cartesian vector Linear magnet described by the Br cylindrical vector Linear magnet described by the Br spherical vector |
vector |
Anisotropic material: nonlinear
approximation 
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|
|---|---|
|
Nonlinear magnet described by HcB, HcJ and the Br module Nonlinear magnet described by Hc and the Br module, plus knee adjustment Nonlinear magnet described by a spline |
unidirectional |
Other specific models are also provided (see table below). Their usage mode is presented in § Spatial model / user model.
| Magnetic property … |
|---|
… spatial linear magnet: μr and  described via spatial
formulae |
Direction of magnetization (orientation)
Magnetization is a vector quantity which can be defined:
- either by a module and a direction (in a coordinate system)
- or by components in a coordinate system
These two modes of definition provided in Flux are presented in the two tables below.
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In a model of the “unidirectional” type the mathematical model and the direction of magnetization are dissociated. |
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|---|---|---|
| Definition | Use | |
| Module of Br |
Direction (in a plane XOY)
|
A single material can be used for definition of several regions (with different directions of magnetization) |
|
In a model of the “vector” type the mathematical model and the direction of magnetization are associated |
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|---|---|
| Definition | Use |
|
It is necessary to create the same number of materials and/or coordinate systems as the regions |