Ferrites and accessories
Symbols and terms
Symbols and terms
Symbol
Meaning
Unit
A
Cross section of coil
mm2
Ae
AL
AL1
Amin
AN
AR
B
Effective magnetic cross section
Inductance factor; AL = L/N2
Minimum inductance at defined high saturation ( a)
Minimum core cross section
Winding cross section
Resistance factor; AR = RCu/N2
RMS value of magnetic flux density
Flux density deviation
mm2
nH
nH
mm2
mm2
= 10–6
Vs/m2, mT
Vs/m2, mT
Vs/m2, mT
Vs/m2, mT
Vs/m2, mT
Vs/m2, mT
Vs/m2, mT
F = As/V
mm–4.5
B
ˆ
B
Peak value of magnetic flux density
Peak value of flux density deviation
DC magnetic flux density
Remanent flux density
ˆ
B
BDC
BR
BS
C0
CDF
DF
d
Saturation magnetization
Winding capacitance
Core distortion factor
Relative disaccommodation coefficient DF = d/i
Disaccommodation coefficient
Activation energy
Ea
J
f
Frequency
s–1, Hz
s–1, Hz
s–1, Hz
s–1, Hz
s–1, Hz
fcutoff
fmax
fmin
fr
Cut-off frequency
Upper frequency limit
Lower frequency limit
Resonance frequency
fCu
g
Copper filling factor
Air gap
mm
H
ˆ
H
RMS value of magnetic field strength
Peak value of magnetic field strength
DC field strength
A/m
A/m
HDC
Hc
h
A/m
Coercive field strength
A/m
Hysteresis coefficient of material
Relative hysteresis coefficient
RMS value of current
10–6 cm/A
10–6 cm/A
A
2
h/i
I
IDC
Direct current
A
ˆ
I
Peak value of current
A
J
Polarization
Vs/m2
k
Boltzmann constant
J/K
k3
k3c
L
Third harmonic distortion
Circuit third harmonic distortion
Inductance
H = Vs/A
Please read Cautions and warnings and
Important notes at the end of this document.
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