[Getdp] Permanent magnet in GetDP

[gilles quemener]

Hi, 

When simulating permanent NdFeB magnets in a homemade BEM program, I use a permeability of 1.05 and a remanent magnetization/field 
depending on the magnet grade as given for instance in the following table : 

Minimum Values 
Grade Br Hc (Hcb) Hci (Hcj) BHmax 
(T) (kA/m) (kA/m) (kJ/m³) 
N27 1.030 796 955 199 
N30 1.080 796 955 223 
N33 1.130 836 955 247 
N35 1.170 867 955 263 
N38 1.210 899 955 287 
N40 1.240 923 955 302 
N42 1.280 923 955 318 
N45 1.320 875 955 342 
N48 1.380 836 875 366 
N50 1.400 796 875 382 
N52 1.430 796 875 398 

Looking closer to the magnet.xxx files in the GetDP demos folder, I cannot figure out how the 
remanent magnetization is taken into account as only Hc seems to be used in the material definition. 
I would think that both Hc and Br should be used. 
How would one distinguish between N40 and N42 grades which have the same Hc values ? How the fact 
that an N50 magnet has a larger remanent field than an N40 one is accounted for in GetDP when 
Hc(N50) is smaller than Hc(N40) and equal to Hc(N27) ? 

Thanks a lot for any hints, 

Gilles 

	

	
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