●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

8

●Curie temperature Tc (゜

C)

This refers to the ambient temperature at which the magnetic

core shifts from strong magnetism to paramagnetism. In actual

practice, to obtain the Curie temperature, the specimen's initial

magnetic permeability is measured and the relationship of this

to temperature is drawn in a diagram. At the bottom, the exten-

sion of the line linking the 80% of maximum point and the 20%

of maximum point is taken as the Curie temperature.

This factor applies when the fluctuation of magnetic permeabili-

ty over time seems to be mostly linear with the time logarithm.

It is expressed by the following formula.

D

.

(t

Here

μ

1

: following complete demagnetization, the magnetic

μ

2

: following complete demagnetization, the magnetic

●Induction factor AL

As shown in the following formula, this refers to self-inductance

that occurs per unit winding in a coil of constant shape and

dimensions wound around the magnetic core.

AL =

Here

L: Self-inductance (H) in the coil when there is a mag-

netic core

N: Number of all the coil's windings

●Resistance

ρ (Ω・m)

This refers to the electrical resistance per unit cross-section

area and unit length.

This is calculated as follows from the magnetic core volume and

weight.

d =

Here W: magnetic core weight (kg)

For the most part the preceding definitions are based on JIS

C2560 "Ferrite Magnetic Core Regulations."

W

V

L

1

μ

1

2

μ

1

---

μ

2

log

10

maximum value

for

80% of the maximum

value for

20% of the maximum value

for

Curie temperature

(Tc)

Temp [

°C]

i

μ

i

μ

i

μ

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