OMEM S.p.A.

17 Dimensional tolerances for toroidal cut cores A A1 A2 B1 B2 C D 40 - 100 ± 2 -3 ± 2 -3 ± 0.5 +1 100 - 200 ± 2.5 -4 ± 2.5 -4 ± 0.7 +1.5 200 - 320 ± 3 -5 ± 3 -5 ± 1 +2 320 - 500 ± 4 -6 ± 4 -6 ± 1 +2.3 500 - 800 ± 5.5 -7 ± 5.5 -7 ± 1.5 +3 > 800 ± 7 -8 ± 7 -8 ± 1.5 +4 Magnetic guarantees for cut Ni-Fe cores Guarantee Thickness [mm] Frequency [Hz] Effective magnetic field [As/cm] Test values 10 ≤ Lm [cm] < 20 20 ≤ Lm [cm] < 40 40 ≤ Lm [cm] < 80 Lm [cm] ≥ 80 Bpeak BN20 0.2 50 0.005 0.009 0.0125 0.015 0.0175 T 0.05 0.11 0.16 0.21 0.25 T 1 0.52 0.58 0.6 0.61 T B(H) curves for 80% nichel - 20% iron 0.2mm toroidal cut core 0,001 0,01 0,1 1 0,001 0,01 0,1 1 10 Bpeak [T] He [As/cm] B(H) curves for 80%Nichel - 20%Iron ,2mm tor idal cut core B(T) BN20 L[cm]<20 B(T) BN20 20<L[cm]<40 B(T) BN20 40<L[cm]<80 B(T) BN20 L[cm]>80 B1 A = NOMINAL INSIDE Ø B2 A2 A1 H D C

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