Material Library in FEMM

[Kingfish]

Greetings –
The stock Materials Library in FEMM for NdFeB is limited to 10, 32, 37, 40, and 52. The 52 value has a nice B-H curve, yet the other values do not.

I admit that I yam a complete noob with this app, however I would like to append the list with values for 42, 45, and 48.

By chance does someone have these sorted out already?

Thanks in advance, KF

[Biff]

Here are the ones I calculated. From my magnet supplier Nblihe (http://www.nblihe.com/n1.htm)
The H grade magnets are good to 120C the SH are good to 150C (as indicated on their product page).

Just paste these into the matlib.dat file in \Program Files\Femm42\bin\ directory at around line 210 (just after the 40 MGOe magnet)

<BeginBlock>

<BlockName> = "Nblihe 40H"

<Mu_x> = 1.09063

<Mu_y> = 1.09063

<H_c> = 923000

<H_cAngle> = 0

<J_re> = 0

<J_im> = 0

<Sigma> = 0.66700000000000326

<d_lam> = 0

<Phi_h> = 0

<Phi_hx> = 0

<Phi_hy> = 0

<LamType> = 0

<LamFill> = 1

<NStrands> = 0

<WireD> = 0

<BHPoints> = 0

<EndBlock>



<BeginBlock>

<BlockName> = "Nblihe 42H"

<Mu_x> = 1.08325

<Mu_y> = 1.08325

<H_c> = 955000

<H_cAngle> = 0

<J_re> = 0

<J_im> = 0

<Sigma> = 0.66700000000000326

<d_lam> = 0

<Phi_h> = 0

<Phi_hx> = 0

<Phi_hy> = 0

<LamType> = 0

<LamFill> = 1

<NStrands> = 0

<WireD> = 0

<BHPoints> = 0

<EndBlock>



<BeginBlock>

<BlockName> = "Nblihe 45H"

<Mu_x> = 1.0990500000000001

<Mu_y> = 1.0990500000000001

<H_c> = 963000

<H_cAngle> = 0

<J_re> = 0

<J_im> = 0

<Sigma> = 0.66700000000000326

<d_lam> = 0

<Phi_h> = 0

<Phi_hx> = 0

<Phi_hy> = 0

<LamType> = 0

<LamFill> = 1

<NStrands> = 0

<WireD> = 0

<BHPoints> = 0

<EndBlock>



<BeginBlock>

<BlockName> = "Nblihe 48H"

<Mu_x> = 1.11968

<Mu_y> = 1.11968

<H_c> = 995000

<H_cAngle> = 0

<J_re> = 0

<J_im> = 0

<Sigma> = 0.66700000000000326

<d_lam> = 0

<Phi_h> = 0

<Phi_hx> = 0

<Phi_hy> = 0

<LamType> = 0

<LamFill> = 1

<NStrands> = 0

<WireD> = 0

<BHPoints> = 0

<EndBlock>



<BeginBlock>

<BlockName> = "Nblihe 40SH"

<Mu_x> = 1.0720500000000031

<Mu_y> = 1.0720500000000031

<H_c> = 939000

<H_cAngle> = 0

<J_re> = 0

<J_im> = 0

<Sigma> = 0.66700000000000326

<d_lam> = 0

<Phi_h> = 0

<Phi_hx> = 0

<Phi_hy> = 0

<LamType> = 0

<LamFill> = 1

<NStrands> = 0

<WireD> = 0

<BHPoints> = 0

<EndBlock>



<BeginBlock>

<BlockName> = "Nblihe 42SH"

<Mu_x> = 1.04813

<Mu_y> = 1.04813

<H_c> = 987000

<H_cAngle> = 0

<J_re> = 0

<J_im> = 0

<Sigma> = 0.66700000000000326

<d_lam> = 0

<Phi_h> = 0

<Phi_hx> = 0

<Phi_hy> = 0

<LamType> = 0

<LamFill> = 1

<NStrands> = 0

<WireD> = 0

<BHPoints> = 0

<EndBlock>



<BeginBlock>

<BlockName> = "Nblihe 45SH"

<Mu_x> = 1.07108

<Mu_y> = 1.07108

<H_c> = 1003000

<H_cAngle> = 0

<J_re> = 0

<J_im> = 0

<Sigma> = 0.66700000000000326

<d_lam> = 0

<Phi_h> = 0

<Phi_hx> = 0

<Phi_hy> = 0

<LamType> = 0

<LamFill> = 1

<NStrands> = 0

<WireD> = 0

<BHPoints> = 0

<EndBlock>

[Kingfish]

Buggery:
I modified the file after making a copy, however the app doesn’t display the new materials. I renamed the file altogether to test if the app can find or use it, but it had no effect.

OK, I found out where the app hides the files…
In Windows 7, FEMM42 puts the user files in this directory:

C:\Users\<User>\AppData\Local\VirtualStore\Program Files (x86)\femm42\bin

T’was easy after that!

Many thanks, KF