Each alloy powder core
of DONGBU is coated with epoxy resin
and marked with a part number except
sendust powder core.
Part numer means core identification
and it includes name code of materials,
core dimension code, apparent inducance
code, temperature stability code, guaranteed
breakdown voltage code adn inductance
tolerance band code.
Core identification for easy distinction
is following as below:
|
Normally, name code of materials, outer
diameter of bare core, apparent inductance
in 1,000 turns adn inductance temperature
stability are stamped on the outside
of the core.
But, for customer order, breakdown voltage
and tolerance band of apparent inductance
are marked in label.
■ EXAMPLE
OF CORE IDENTIFICATION
|
NAME CODE OF MATERIALS AND COLOR OF
TOROIDAL CORE
Material name code of material
and color are following as below:
- MOLYPERMALLOY POWDER CORE : M
(Gray)
- SENDUST POWDER CORE
: S (Black)
- HIGH FLUX POWDER CORE
: H (Khaki)
OUTER DIAMETER
OF COATED CORE
It means diameter of toroidal core.
(first 3 digits in 1/100 inches)
※ please see specification table
for detailed term
APPARENT INDUCTANCE
IN 1,000 TURNS
It means apparent inductance of
toroidal core.
(3 digits of apparent inductance is
value in mH per 1,000 turns)
BREAKDOWN VOLTAGE
It means breakdown
voltage of core and is following as
the below table2 :
Table
2. BREAKDOWN VOLTAGE
|
|
CODE |
GUARANTEED BREAKDOWN VOLTAGE |
|
NO MARK |
>500Volts |
|
1 |
>1,000Volts |
|
2 |
>2,000Volts |
|
3 |
>4,000Volts |
|
TOLERANCE OF
APPARENT INDUCTANCE
It means tolerance of apparent inductance
and is following as the below table3
:
Table 3. TOLERANCE
OF APPARENT INDUCTANCE. |
|
CODE
|
TOLERANCE
OF APPARENT INDUCTANCE
(DEVIATION FROM NOMINAL, %) |
|
NO MARK |
+8% - -8% |
|
+ |
+8% - 0% |
|
- |
0% - -8% |
|
+8 |
+8% - +7% |
|
+6 |
+7% - +5% |
|
+4 |
+5% - +3% |
|
+2 |
+3% - +1% |
|
0 |
+1% - -1% |
|
-2 |
-1% - -3% |
|
-4 |
-3% - -5% |
|
-6 |
-5% - -7% |
|
-8 |
-7% - -8% |
|
|
|
