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002-01 / 20071116 / e16_1.fm
• All specifications are subject to change without notice.
SATURATION MAGNETIC FLUX AMPLITUDE PERMEABILITY vs. MAGNETIC PERMEABILITY vs.
DENSITY vs. TEMPERATURE SATURATION MAGNETIC FLUX FREQUENCY CHARACTERISTICS
CHARACTERISTICS DENSITY CHARACTERISTICS
INITIAL MAGNETIC PERMEABILITY vs.
TEMPERATURE CHARACTERISTICS
DIMENSIONAL RESONANCE
Dimensional resonance is a phenomenon which increases loss
and decreases magnetic permeability by electromagnetic standing
waves when the magnetic field of the core frequency is applied.
The phenomenon appears when the maximum dimension of the
cross section of the core perpendicular to the magnetic field is the
integral multiple of about half of the electromagnetic wavelength
λ.
C: Electromagnetic wave speed in a vacuum(3.0×10
8
m/s)
µ
r: Relative magnetic permeability
ε
r: Relative permissivity
f: Frequency of the applied magnetic field(electromagnetic wave)
As µe decreases by inserting into the gap, using the same core
enables high frequency wave usage as indicated by the formula
above.
As dimensional resonance quickly decreases magnetic permeabil-
ity, design the actual frequency to avoid dimensional resonance.
In the case of possible dimensional resonance, it can be protected
against by dividing the core in the magnetic circuit direction and
bonding them.
RESONANCE DIMENSION vs. FREQUENCY
CHARACTERISTICS
100
200
300
400
500
600
700
0
150100500
Temperature
(
˚C
)
B
s
(
mT
)
PE22
PC40
1000
2000
3000
0
10
4
10
3
10
2
10
1
Frequency
(
kHz
)
µ′, µ′′
Material: PE22
Temp.: 23
˚C
µ′
µ′′
3000
4000
5000
2000
3002001000
Flux density
(
mT
)
µ
a
120˚C
100˚C
80˚C
60˚C
40˚C
23˚C
Material: PE22
f=16kHz
2000
1000
6000
0
3002001000
Temperature
(
˚C
)
µ
i
PE22
PC40
4000
3000
5000
f=1kHz
H
m
=0.4A/m
3000
4000
5000
2000
3002001000
Flux density
(
mT
)
µ
a
120˚C
100˚C
80˚C
60˚C
40˚C
23˚C
Material: PC40
f=16kHz
1000
2000
3000
0
10
4
10
3
10
2
10
1
Frequency
(
kHz
)
µ′, µ′′
Material: PC40
Temp.: 23
˚C
µ′
µ′′
λ=
f ×
µ
r
ε
r
×
C
10
3
10
2
10
1
10
3
10
2
10
1
Frequency
(
kHz
)
Resonant dimension
(
mm
)
PE22
PC40