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FEER22S Datasheet(PDF) 7 Page - NEC

Part # FEER22S
Description  Ferrite Cores
Download  71 Pages
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Manufacturer  NEC [NEC]
Direct Link  http://www.nec.com/
Logo NEC - NEC

FEER22S Datasheet(HTML) 7 Page - NEC

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●All specifications in this catalog and production status of products are subject to change without notice. Prior to the purchase, please contact NEC TOKIN for updated product data.
●Please request for a specification sheet for detailed product data prior to the purchase.
●Before using the product in this catalog, please read "Precautions" and other safety precautions listed in the printed version catalog.
9603FERVOL05E1001T0
Ferrite Cores VOL.05
7
tan
δ==
= tan
δ
h
+ tan
δ
e
+ tan
δ
r
= h1
× i + e
1
f + r1
Here Rm: loss resistance (
Ω) of the magnetic core alone
Reff: loss resistance (
Ω) of the coil including the mangetic core
Rw: loss resistance (
Ω) of the windings alone
L: inductance (H) of the coil including the magnetic core
V: magnetic core volume (mm)
i: current (A)
ω: angular frequency 2π f(rad/s)
f: frequency (Hz)
tan
δ
h
: hysteresis loss factor
tan
δ
e
: vortex current loss factor
tan
δ
r
: residual loss factor
h1: hysteresis loss coefficient
e1: vortex current loss coefficient
r1: residual loss coefficient
However with ferrite, separate calculation of tan
δ
e
and tan
δ
r
is
difficult, so it is convenient to express them together as follows.
tan
δ = tan δ
h
+ tan
δ
f
●Relative loss factor tan
δ / μi
This refers to the value of the loss factor divided by the alternat-
ing current initial magnetic permeability.
=
Note: The following formula applies when the magnetic circuit
gap is small.
with gap
without gap
●Relative hysteresis loss factor h
10
As shown in the next formula, this refers to the value when
h1=1000.
h10 = h1
●Relative temperature factor for initial magnetic permeability
αμγ
"Relative temperature factor for initial magnetic permeability" re-
fers to the "temperature factor for initial magnetic permeability"
divided by "initial magnetic permeability"
μ
1
.
αμ ==
.
(T
2 > T1)
αμγ =
.
(T
2 > T1)
μ
1
: initial magnetic permeability at temperature T1
μ
2
: initial magnetic permeability at temperature T2
1
T2---T1
μ
2
---
μ
1
μ2
1
1
T2---T1
μ
2
---
μ
1
μ
1
αμ
i
μ
i
3
2
1000
μ
tan
δ
μ
i
tan
δ
μ
e
μ"s
(
μ's)2
tan
δ
μ
i
L
V
Reff---Rw
ωL
Rm
ωL
フェライトコア5版_E 10.1.23 13:24 ページ 7


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