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properties
Magnetic Design Formulas
Permeability vs Frequency
Core Loss A,B
Core Loss C,E
Core Loss F,G
E Cores
Dimension Tolerance
Toroids
OD(mm)
ID(mm)
HT(mm)
C03〜C06
±0.3
±0.3
±0.3
C07〜C19
±0.5
±0.5
±0.5
C21〜C33
±0.6
±0.6
±0.6
C34〜C57
±0.75
±0.75
±0.75
Magnetic Design Formulas
Inductance Considerations
where
L=inductance(Henries)
μ=core permeability
N=number of turns
Ae=core cross section(cu)
Le=core magnetic path length(cm)
where
Ln=inductance for N turns (μH)
AL=nominal inductance (nH/N2)
Voltage-Flux Density-Frequency (Faraday's Law)
Where
Bmax=maximum flux density
Erms=equivalent rms voltage across coil
N=number of turns
A=core cross section(cu)
f=frequency(herz)
Ampere's Law
where
H=magnetizing force
N=number of turns
I=peak current(amperes)
L=mean magnetic path(cm)
where
μ=relative premeability
B=flux denxity(gausses)
H=magnetizing force(oersteds)
Mean Magnetic Path Length
OD=outside diameter of core(cm)
ID=inside diameter of core(cm)
HT=core height(cm)
A=core cross section(cu)
l=mean magnetic path length(cm)
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