Isotropic soft magnetic material: iron sheets described by LS model

Presentation

This model defines a nonlinear B(H) dependence for an isotropic material, from predefined sheets included in the software or from personal materials that the user can import by himself (see: LS model identification with MILS). During solving the behavior of this model is the same as an isotropic spline but in post processing for the computation of iron losses, Flux takes benefit of this dedicated model of dynamic hysteresis (LS model : Iron losses: à posteriori LS model), for which all the data to compute iron losses in the post-processing are already stored in the material description. The interest of this model is to have an accurate computation of iron losses in post-processing without getting the trouble of convergence and computation time of an hysteresis model during solving.

Software aspects

Before solving :
  • In the menu Physics, click on Materials
  • In the B(H) properties choose: Iron sheets described by LS model
  • Choose one of the predefined sheets
  • or import your own material with its iron losses properties (see: LS model identification with MILS)
  • Assign the material to a Laminated magnetic non conducting region
The list of available predefined sheets is the following:
  • NO 25
  • M250-50A
  • M270-35A
  • M330-35A
  • M330-65A
  • M400-50A
  • M600-50A
  • M600-65A
  • M800-50A
  • M800-65A

For M800-50A grade, a full set of measurements is provided in the Flux setup and may be found at the following path: Flux_Installation_Folder\Flux\Resources\material\LsModelMeasurements\M800-50A for readers interested in learning more on the LS model identification with MILS. Measurements for the other grades cannot be shared, since they are confidential data.

For more information about electrical steel sheets, see this page: Standards for electrical steel sheets

Materials defined in Flux as iron sheets described by LS model enable in post-processing to evaluate the iron losses; the reader can refer to this page for the detailed workflow to follow.

Limitations

This model can be only applied on laminated magnetic non conducting regions.

Links

Iron losses: à posteriori LS model

LS model identification with MILS