●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

× i + e

1

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

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

●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

αμγ =

.

(T

μ

1

μ

2

1

μ

2

---

μ

1

1

1

μ

2

---

μ

1

μ

1

αμ

i

μ

i

3

2

⎞

⎟

⎠

1000

μ

⎛

⎜

⎝

⎞

⎟

⎠

tan

δ

μ

i

⎛

⎜

⎝

⎞

⎟

⎠

tan

δ

μ

e

⎛

⎜

⎝

μ"s

(

tan

δ

μ

i

L

V

Reff---Rw

ωL

Rm

ωL

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