FM25G142MYBPF Hitachi Metals, Ltd, FM25G142MYBPF Datasheet - Page 18

• Manufacturer Part Number: FM25G142MYBPF
• Description: Three-phase Fm-a Coils
• Manufacturer: Hitachi Metals, Ltd

18
* DC magnetic properties at 800A/m
Figure 52. Temperature dependence of impedance permeability (μ rz )
Table 15. Comparison of magnetic and physical properties between FINEMET and Mn-Zn ferrite
Initial permeability ,μr'
Impedance permeability ,μrz
Saturation magnetic flux density, Bs* （ T）
Residual magnetic flux density, Br* （T）
Coercive force, Hc*
Curie temperature, Tc
Saturation magnetostriction, λ s［×10
Electrical resistivity,
Density, d
In the product line of FINEMET
permeability material "FT-3KM" and (2) high saturation-field material "FT-3KL".
impedance in wide frequency range.
Features for cores made of "FT-3KM"
The cores made of high permeability FT-3KM have the following advantages over commonly used Mn-Zn ferrite cores:
1) Four times higher impedance due to high impedance
Common Mode Choke Cores
permeability,
・ The coils have four times higher impedance with same
100000
100000
10000
The real part of complex permeability (μr') at 100kHz and
20℃ reaches more than twice as high as that of Mn-Zn
ferrite cores. The impedance relative permeability (μrz)
including imaginary part of complex permeability (μr")
reaches more than four times as high as that of Mn-Zn
ferrite cores.
The cores shows following benefits (Table 15, Figure 50, 51):
10000
Figure 50. μ rz , μ r
1000
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1000
100
100
for FINEMET FT-3KM
1
1
10
10
,
and μ r
Frequency (kHz)
Frequency (kHz)
［100kHz］
［100kHz］
（μΩ ・ m）
（kg/m
（A/m）
100
（℃）
100
,,
for FINEMET FT-3KM
-6
3
）
］
100
140
®
-40
-20
20
60
0
common mode choke cores, there are two types of cores made of (1) high
100℃
100℃
100℃
100℃
100℃
20℃
20℃
20℃
20℃
20℃
1000
1000
μ rz
μ r '
μ r "
10000
10000
∼ −
7.3×10
FT-3KM
17,000
18,000
26,900
27,100
570
1.23
1.20
0.62
0.59
2.5
2.7
0.0
1.2
3
Figure 53. Temperature dependence of impedance permeability (μ rz )
2) Stable magnetic properties against temperature change.
・ Winding turns can be 1/2 reduced to obtain same impedance.
・ Reducing winding turns allow significant reduction of stray
100000
winding turns.
capacitance, which result in having large impedance in
high frequency range.
Inductance and impedance of the common mode chokes
are very stable against temperature change due to high
Curie temperature. (Figure 52, 53).
10000
100000
1000
10000
100
1000
100
for Mn-Zn ferrite
Figure 51. μ rz , μ r
1
1
∼ −
7.3×10
FT-3KL
17,000
15,000
18,500
16,000
570
1.23
1.20
0.06
0.04
0.6
0.6
0.0
1.2
10
10
3
Frequency (kHz)
Frequency (kHz)
,
and μ r
100
100
Both cores have high
,,
100
140
-40
-20
20
60
for Mn-Zn ferrite
0
1000
1000
Mn-Zn ferrite
1.0×10
4.85×10
-1.1
5,300
7,000
5,300
7,000
150
0.44
0.27
0.10
0.06
8.0
4.9
μ rz
μ r '
μ r "
6
3
10000
10000