ASTM A1009-00

Standard Specification for Soft Magnetic MnZn Ferrite Core Materials for High Frequency (10 kHz-1 MHz) Power Transformer and Filter Inductor Applications

SCOPE
1.1 This specification covers the requirements to which the specified grades of soft magnetic MnZn ferrite materials shall conform. Cores made from these materials are used primarily in power transformers and filter inductors.
1.2 The values stated in customary (cgs-emu and inch-pounds) units are to be regarded as standard. The values given in parentheses are mathematical conversions to SI units, which are provided for information only and are not considered standard.

General Information

• Status: Historical
• Publication Date: 09-May-2000
• ICS: 29.100.10 - Magnetic components
• Technical Committee: A06 - Magnetic Properties
• Drafting Committee: A06.02 - Material Specifications

Relations

• Replaced By: ASTM A1009-05 - Standard Specification for Soft Magnetic MnZn Ferrite Core Materials for High Frequency (10 kHz-1 MHz) Power Transformer and Filter Inductor Applications
• Effective Date: 01-Nov-2005

Standards Content (Sample)

NOTICE: This standard has either been superseded and replaced by a new version or withdrawn.
Contact ASTM International (www.astm.org) for the latest information
Designation: A 1009 – 00
Standard Specification for
Soft Magnetic MnZn Ferrite Core Materials for High
Frequency (10 kHz-1 MHz) Power Transformer and Filter
Inductor Applications
This standard is issued under the fixed designation A 1009; the number immediately following the designation indicates the year of
original adoption or, in the case of revision, the year of last revision. A number in parentheses indicates the year of last reapproval. A
superscript epsilon (e) indicates an editorial change since the last revision or reapproval.
1. Scope 3.2.3.1 Customary Units
2 –9
1.1 This specification covers the requirements to which the
L 5 4PAN 10 /l,H
air 1
specified grades of soft magnetic MnZn ferrite materials shall
where:
conform. Cores made from these materials are used primarily
N = number of turns on winding;
in power transformers and filter inductors.
A = cross-sectional area of core specimen, cm ; and
1.2 The values stated in customary (cgs-emu and inch-
l = effective magnetic path length, cm.
pounds) units are to be regarded as standard. The values given
3.2.3.2 SI Units
in parentheses are mathematical conversions to SI units, which
2 –7
are provided for information only and are not considered
L 5 4PAN 10 /l,H
air 1
standard.
where:
N = number of turns on winding;
2. Referenced Documents
A = cross-sectional area of core specimen, m ; and
2.1 ASTM Standards:
l = effective magnetic path length, m.
A 340 Terminology of Symbols and Definitions Relating to
Magnetic Testing
4. Classification
4.1 The soft magnetic MnZn ferrite material-type designa-
3. Terminology
tions for power transformer and filter inductor materials
3.1 The terms and symbols used in this specification are
covered by thisASTM specification are listed inTable 1,Table
defined in Terminology A 340.
2,andTableX1.1.Theprefixofthetypedesignationsidentifies
3.2 Definitions of Terms Specific to This Standard:
each material’s intended use. Power transformer materials are
3.2.1 Inductance Index (AL value)—the self inductance per
denoted with the prefix “P” and filter materials are denoted
winding turn squared (L/N ) expressed in units of nanohenries
2 with the prefix “F.”
per turns squared (nH/N ).
4.2 The first and second digits of the type designations for a
power transformer material identify the typical core loss
where:
–9 3
density of the material in mW/cm , and the last two digits
n = nano = 10 ,
nH = inductance in nanohenries, and
identify the temperature of the minimum core loss in °C.
N = number of turns on winding (example: 0.005 H with
4.3 The last four digits of the type designations for filter
2 2 2
a 100 turn coil = 0.005/(100) H/N = 500 nH/N ).
materials identify the typical relative inductance permeability.
3.2.2 Mated Core Set—Two or more core segments as-
5. Ordering Information
sembled with the magnetic flux path perpendicular to the
mating surface.
5.1 Orders for material under this specification shall include
3.2.3 Air core inductance, L , is the inductance of a core such of the following information as is required to describe the
air
with the same magnetic path length and cross-sectional core material adequately.
area but with the relative permeability of air. 5.1.1 ASTM specification number including year of issue or
revision.
5.1.2 ASTM soft magnetic MnZn ferrite material-type des-
This specification is under the jurisdiction of ASTM Committee A06 on
ignation.
Magnetic Properties and is the direct responsibility of Subcommittee A06.02 on
5.1.3 Core shape, size, dimensions, and dimensional toler-
Material Specifications.
Current edition approved May 10, 2000. Published August 2000. ances.
Annual Book of ASTM Standards, Vol 03.04.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.
A1009–00
TABLE 1 Power Transformer Material Type Designations and
which is dependent on the material permeability. Each filter
Magnetic Requirements
material type is identified by its minimum and maximum
Maximum Core Loss Temperature
relative inductance permeability as shown in Table 2.
Minimum Saturation Flux
Density at Temperature of of Minimum
B
Density
ASTM Power A
Minimum Core Loss Core Loss
7. Mechanical Properties
Material
Customary
Type
SI Units, SI Units, Customary SI Units,
7.1 Typical material constants for soft magnetic MnZn
Units, mW/
W/m °C Units, Gauss Tesla
cm
ferrite materials are given in Table X1.2 of Appendix X1.
P5080 60 60 000 80 5000 0.5
P7070 80 80 000 70 5000 0.5 8. Dimensional Tolerances
P7099 80 80 000 100 5000 0.5
8.1 For sintered (unground) dimensions, the tolerances shall
P8040 90 90 000 40 5000 0.5
be 62%.
A
Core loss test conditions: 100 kHz, 1000 gauss [0.1 tesla] at temperature of
minimum core loss. 8.2 Formachinedheights,thetolerancesshallbe 60.005in.
B
Saturation flux density test conditions: 1 kHz, 15 oersteds [1200 A/m], at 25°C.
(0.13 mm).
TABLE 2 Filter Inductor Material Type Designations and 9. Workmanship, Finish and Appearance
Magnetic Requirements
9.1 All mating surfaces of the core shall be free of dirt or
Minimum Relative Maximum Relative
any other foreign material. Foreign material or surface crazing
ASTM Filter
A A
Inductance Permeability, Inductance Permeability,
Material Type
that interfere mechanically or electrically are not allowed.
µ µ
L L
9.2 The largest dimension of a chip, crack, pit, or surface
F010K 7000 13 000
void must not exceed one third the smallest dimension of the
F5000 3750 6 500
F3000 2250 3 900
surface under consideration.
A
Relative inductance permeability test conditions: 100 kHz, 5 gauss [0.0005
tesla], at 25°C.
10. Test Methods
10.1 Core losses are deter
...