Learning Forum

[Bishwas Basnet]

I am trying to supply custom material with all BH data points. The data is reliable and clean. But when I apply and run the analysis I get errors as shown in below screen shots. I have measure slopes to confirm and the maximum slope is no more than 1.28 between any two consecutive points. Then how come this error? It is really weird. I am sure about the data because the curve actually looks very similar to datasheet curve as well. 

How to solve this error? 

 

[Navya C]

Hi Bishwas,

When defining the BH Curve please check if your definition meets the following requirements

Note the following requirements for creating a valid curve:

• For a Normal BH curve, the slope of the curve can not be less than that of free space anywhere along the curve.
• For an Intrinsic BH curve, the slope of the curve can not be less than 0.
• The value of B must increase along the curve.
• The initial value of B must be 0 (zero).
• Since BH operating points in the FEA solution may extend beyond the input BH data set, the BH data set is extrapolated in Maxwell. The slope of the last two user-defined data points is used to extrapolate the BH curve, and thus should be as close to μ₀ as possible.
• The data points representing the BH curve should have enough points to represent the curve accurately. Twenty (20) or more points should be specified with increased representation on the "knee" of the curve.
  
  For further information refer to "Specifying BH Curves for Nonlinear Relative Permeability" section in Maxwell help.

Navya