Demagnetization Coefficient Plots

BH curve with recoil line and worst-case BH point

Demagnetization Coefficient: Demag_coef[%] = Br1/Br0*100%

When Demag_Coef = 1, the magnet behaves without any demagnetization at that location.

When Demag_Coef = 0, the magnet is fully demagnetized at that location.

Demag_Coef Plot over the Geometry of Nonlinear Permanent Magnets:

Demag_Coef is a scalar value between 0 and 1, and is displayed as a color shaded plot inside nonlinear permanent magnets. Demag_Coef is applicable to 2D/3D transient solutions, and 2D/3D magnetostatic solutions - assign to objects by right-clicking them and selecting Fields > Other > Demag_Coef. Solvers provide the quantity at each node element-by-element to the post-processor for all nonlinear permanent magnetic objects at each timestep with the saved field.

Access to the Demag Coefficient field from the right-click Fields, other menu

Create Field Plot that includes Demag Coeff quantity

Demag Coef displayed as a color shaded plot inside nonlinear permanent magnets

Demag_Coef Curve as a Function of Time at Specific Locations:

This function is provided in terms of the expression cache at any specified point in the magnet. This plot is only applicable to 2D/3D transient solutions.

Report window showing Demag Coeff as a Calculator expression

Plot of a demagnetization coefficient as a specified point

Demagnetization Percentage Statistics Curve as a Function of Time over All Magnet Volumes

For a specified Demag_Coef threshold, determine what the percentage of total volume for all magnets is, whose Demag_Coef is equal or greater than the specified Demag_Coef threshold. To determine this, the solver uses the Demag_Coef threshold values from 0.1 to 0.9, with 0.1 as the step interval, to compute the Demag Percentage statistics (VolumePercentageAbove10Percent through VolumePercentageAbove90Percent) at each timestep.

Report window configured to report demagnetization percentage of selected volumes

As a result, the output is a series of nine curves from 0.1 to 0.9 similar to the example shown below. This plot is only applicable to 2D/3D transient solutions.

Demagnetization percentage plots of several volumes