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% |
|
|
|
