Núcleo de inductores de Ferrite
Formula:
N = 1000 * SQR( L / A(l) )
N = número de vueltas, L = desired inductance in mH, A(l) = valor de la tabla siguiente:
Core 63/67-Mix 61-Mix 43-Mix 77 (72) Mix J (75) Mix
Size u = 40 u = 125 u = 850 u = 2000 u = 5000
------ --------- ------- ------- ----------- ----------
FT-23 7.9 24.8 188.0 396 980
FT-37 19.7 55.3 420.0 884 2196
FT-50 22.0 68.0 523.0 1100 2715
FT-82 22.4 73.3 557.0 1170 na
FT-114 25.4 79.3 603.0 1270 3170
Propiedades mágnéticas del Ferrite
Property Unit 63/67-Mix 61-Mix 43-Mix 77(72) Mix J(75) Mix
------------------- -------- --------- --------- --------- ---------- ----------
Initial perm. u(i) 40 125 850 2000 5000
Max perm. 125 450 3000 6000 8000
Saturation flux
density @ 10 oer Gauss 1850 2350 2750 4600 3900
Residual flux
density Gauss 750 1200 1200 1150 1250
Curie temp. deg C 450 350 130 200 140
Vol. resistivity ohm/cm 1E8 1E8 1E5 1E2 5E2
Resonant circuit
frequency MHz 15-25 0.2-10 0.01-1 0.001-1 0.001-1
Specific gravity 4.7 4.7 4.5 4.8 4.8
Loss factor 1/ 110E-6 32E-6 120E-6 4.5E-6 15E-6
Q * u(i) @25 MHz @2.5 MHz @1 MHz @0.1 MHz @0.1 MHz
Coercive force Oer 2.40 1.60 0.30 0.22 0.16
Temp. Coef. of %/deg C
initial perm. (20-70 C) 0.10 0.15 1.0 0.60 0.90
NOTE: 1E6 is shorthand for 1 * 10^6 (one times ten raised to the 6th power).
Propiedades físicas del toroide de Ferrite
Core
Size OD ID Height A(e) I(e) V(e) A(s) A(w)
------ ------ ------ ------ -------- -------- -------- -------- ---------
FT-23 0.230 0.120 0.060 0.00330 0.529 0.00174 0.1264 0.01121
FT-37 0.375 0.187 0.125 0.01175 0.846 0.00994 0.3860 0.02750
FT-50 0.500 0.281 0.188 0.02060 1.190 0.02450 0.7300 0.06200
FT-82 0.825 0.520 0.250 0.03810 2.070 0.07890 1.7000 0.21200
FT-114 1.142 0.750 0.295 0.05810 2.920 0.16950 2.9200 0.43900
OD - Outer diameter (inches) A(e) - Effective magnetic cross-sectional are (in^2)
ID - Inner diameter (inches) I(e) - Effective magnetic path length (inches)
Height - Height (inches) V(e) - Effective magnetic volume (in^2)
A(s) - Survace area exposed for cooling (in^2)
A(w) - Total window area (in^2)
Cortesía de Amidon Association
