<html><body><div style="font-family: arial, helvetica, sans-serif; font-size: 12pt; color: #330066"><div>Hi,<br></div><div><br data-mce-bogus="1"></div><div>When simulating permanent NdFeB magnets in a homemade BEM program, I use a permeability of 1.05 and a remanent magnetization/field<br data-mce-bogus="1"></div><div>depending on the magnet grade as given for instance in the following table :<br data-mce-bogus="1"></div><div><br data-mce-bogus="1"></div><div><span style="font-family: "courier new",courier,monaco,monospace,sans-serif;" data-mce-style="font-family: 'courier new',courier,monaco,monospace,sans-serif;">Minimum Values</span><br><span style="font-family: "courier new",courier,monaco,monospace,sans-serif;" data-mce-style="font-family: 'courier new',courier,monaco,monospace,sans-serif;">Grade Br Hc (Hcb) Hci (Hcj) BHmax</span><br><span style="font-family: "courier new",courier,monaco,monospace,sans-serif;" data-mce-style="font-family: 'courier new',courier,monaco,monospace,sans-serif;"> (T) (kA/m) (kA/m) (kJ/m³)</span><br><span style="font-family: "courier new",courier,monaco,monospace,sans-serif;" data-mce-style="font-family: 'courier new',courier,monaco,monospace,sans-serif;">N27 1.030 796 955 199</span><br><span style="font-family: "courier new",courier,monaco,monospace,sans-serif;" data-mce-style="font-family: 'courier new',courier,monaco,monospace,sans-serif;">N30 1.080 796 955 223</span><br><span style="font-family: "courier new",courier,monaco,monospace,sans-serif;" data-mce-style="font-family: 'courier new',courier,monaco,monospace,sans-serif;">N33 1.130 836 955 247</span><br><span style="font-family: "courier new",courier,monaco,monospace,sans-serif;" data-mce-style="font-family: 'courier new',courier,monaco,monospace,sans-serif;">N35 1.170 867 955 263</span><br><span style="font-family: "courier new",courier,monaco,monospace,sans-serif;" data-mce-style="font-family: 'courier new',courier,monaco,monospace,sans-serif;">N38 1.210 899 955 287</span><br><span style="font-family: "courier new",courier,monaco,monospace,sans-serif;" data-mce-style="font-family: 'courier new',courier,monaco,monospace,sans-serif;">N40 1.240 923 955 302</span><br><span style="font-family: "courier new",courier,monaco,monospace,sans-serif;" data-mce-style="font-family: 'courier new',courier,monaco,monospace,sans-serif;">N42 1.280 923 955 318</span><br><span style="font-family: "courier new",courier,monaco,monospace,sans-serif;" data-mce-style="font-family: 'courier new',courier,monaco,monospace,sans-serif;">N45 1.320 875 955 342</span><br><span style="font-family: "courier new",courier,monaco,monospace,sans-serif;" data-mce-style="font-family: 'courier new',courier,monaco,monospace,sans-serif;">N48 1.380 836 875 366</span><br><span style="font-family: "courier new",courier,monaco,monospace,sans-serif;" data-mce-style="font-family: 'courier new',courier,monaco,monospace,sans-serif;">N50 1.400 796 875 382</span><br><span style="font-family: "courier new",courier,monaco,monospace,sans-serif;" data-mce-style="font-family: 'courier new',courier,monaco,monospace,sans-serif;">N52 1.430 796 875 398</span><br data-mce-bogus="1"></div><div><span style="font-family: "courier new",courier,monaco,monospace,sans-serif;" data-mce-style="font-family: 'courier new',courier,monaco,monospace,sans-serif;"><br data-mce-bogus="1"></span></div><div><span style="font-family: "courier new",courier,monaco,monospace,sans-serif;" data-mce-style="font-family: 'courier new',courier,monaco,monospace,sans-serif;">Looking closer to the magnet.xxx files in the GetDP demos folder, I cannot figure out how the <br data-mce-bogus="1"></span></div><div><span style="font-family: "courier new",courier,monaco,monospace,sans-serif;" data-mce-style="font-family: 'courier new',courier,monaco,monospace,sans-serif;">remanent magnetization is taken into account as only Hc seems to be used in the material definition.<br data-mce-bogus="1"></span></div><div><span style="font-family: "courier new",courier,monaco,monospace,sans-serif;" data-mce-style="font-family: 'courier new',courier,monaco,monospace,sans-serif;">I would think that both Hc and Br should be used.<br data-mce-bogus="1"></span></div><div><span style="font-family: "courier new",courier,monaco,monospace,sans-serif;" data-mce-style="font-family: 'courier new',courier,monaco,monospace,sans-serif;">How would one distinguish between N40 and N42 grades which have the same Hc values ? How the fact </span></div><div><span style="font-family: "courier new",courier,monaco,monospace,sans-serif;" data-mce-style="font-family: 'courier new',courier,monaco,monospace,sans-serif;">that an N50 magnet has a larger remanent field than an N40 one is accounted for in GetDP when </span></div><div><span style="font-family: "courier new",courier,monaco,monospace,sans-serif;" data-mce-style="font-family: 'courier new',courier,monaco,monospace,sans-serif;">Hc(N50) is smaller than Hc(N40) and equal to Hc(N27) ?<br data-mce-bogus="1"></span></div><div><span style="font-family: "courier new",courier,monaco,monospace,sans-serif;" data-mce-style="font-family: 'courier new',courier,monaco,monospace,sans-serif;"><br data-mce-bogus="1"></span></div><div><span style="font-family: "courier new",courier,monaco,monospace,sans-serif;" data-mce-style="font-family: 'courier new',courier,monaco,monospace,sans-serif;">Thanks a lot for any hints,<br data-mce-bogus="1"></span></div><div><br></div><div data-marker="__SIG_PRE__"><div><div> <span style="color: #003366;"> Gilles <br></span></div></div><div><table style="width: 747px; table-layout: fixed; height: 141px;" cellpadding="3" border="0"><tbody><tr><td style="width: 280px;"><br></td><td><br></td></tr></tbody></table><br><table style="width: 792px; table-layout: fixed; height: 145px;" cellpadding="0" border="0"><tbody><tr><td style="width: 200px; text-align: left;"></td><td><span style="color: #000080; font-size: 10pt;"></span><span style="color: #000080; font-size: 10pt;"></span></td></tr></tbody></table></div></div></div></body></html>