Since version 2026, Flux 3D and Flux PEEC are no longer available.
Please use SimLab to create a new 3D project or to import an existing Flux 3D project.
Please use SimLab to create a new PEEC project (not possible to import an existing Flux PEEC project).
/!\ Documentation updates are in progress – some mentions of 3D may still appear.
Magnet (unidirectional): linear approximation
Presentation
This model (Linear magnet described by the Br module) defines a B(H) dependence of linear demagnetization.
Main characteristics:
- the mathematical model and the direction of magnetization are dissociated
- a single material for description of several regions
Mathematical model
In the direction of magnetization the model is a straight line.
The corresponding mathematical formula is written as follows:
B//(H)= μ0μr//H//+Br
where:
- μ0 is the permeability of vacuum, μ0 = 4 π 10-7 H/m
- μr// is the relative permeability (recoil line slope)
- Br is the remanent flux density (T)
The shape of the B(H) dependence in the direction of magnetization is given in the following figure.
In transversal directions one can write:
B⊥(H)= μ0μr⊥H⊥
where μr⊥ is the transverse relative permeability (μr⊥ = μr//)
Direction of magnetization
The direction of permanent magnet magnetization is “dissociated” from the model. In the software, it is defined separately.
The various possibilities available to the user are shown in the table below. (The basic plane is a plane XOY.)
|
 |
|
 |
 |
| Unidirectional |
Radial positive |
Radial negative |
Orthoradial positive | Orthoradial negative |
CR is the radiality center.